Residential Standards: Canada: 1977

RESIDENTIAL STANDARDS

CANADA

1977

ARCHiVES

THIS DOCUMENT IS NOT INTENDED

AS A MUNICIPAL BYLAW

Issued

the

Associate Committee on the National Building Code

National Research Council of Canada

Ottawa, Canada

NRCC No. 15563

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ASSOCIATE COMMITI'EE ON TIlE NA110NAL BUILDING CODE

.

A. G. Wilson (Chairman)

H. B. Dickens (Deputy Chairman)

S. D. C. Chutter D. E.Comish S. Cumming R. F. DeGrace M.O.Dixon J. T.Oregg W. B.Ouihan R. V. Hebert J. S. Hicks

M. S. Hurst (ex officio)

H. T.Jones P. M. Keenleyside J. Longworth J. A. McCambly C. J. McConnell R. C. McMillan Retired·

D. O. Monsen (ex officio)

A. T. Muir·· F.-X. Perreault A. R. Pitt G. B.Pope H. R. Stenson R. A. W. s"itzer A. D. Thompson J. E. Turnbull C.J. Ward

D. W. Boyd (Research Advisor-Meteorology)

R. S. Ferguson (Research Advisor)

R. H. Dunn (Secretary)

C. D. Carruthers (Chairman until November, 1975)

STANDING COMMITTEE ON HOUSING AND SMALL BUILDINGS A. T. Muir (Chairman)*· G. N. Bilous R. F. Buckingham"· M.G.Dixon N.Gauthier J. E. Gillespie W. G. Griffiths D. Jackson P. Jones A. W. Kempthome D. E. Kennedy J. Kerr Retired· G.Adams E. C. MacNeamey W. M. McCance A. W. Mcintyre E.F.Osbome E. Talback A. Thorimbert B. Trempe H. T. Work

A. T. Hansen (Research Advisor)

J. F. K. Summers (Secretary)

"Committee term completed during preparation of 1977 Code . .... Deceased September 16, \976 .

... Appointed Chairman October, 1976.

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NOTICE

The metric pamphlet mentioned in boldface type in the Preface is no longer available. How-ever, a metric edition of Residential Standards 1977 is now available from Central Mortgage and Housing Corporation. Copies can be obtained from your nearest Central Mortgage and Housing Corporation office.

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RESIDENTIAL STANDARDS

CANADA

1977

Issued by the

Associate Committee on the National Building Code

National Research Council of Canada

Ottawa, Canada

NRCC No. 15563

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First Edition 1965 Second Edition 1970

Third Edition 1975 Fourth Edition 1977

ISSN 0700-1304

©National Research Council of Canada 1977 World Righ ts Reserved

Printed in Canada

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v

TABLE OF CONTENTS

Page

Preface . . . • . . . . • . • . .•. ~ . . • . . . • . • . . . • . . . • . ••

vii

Section 1

* Section 2

Section

3

Section

4

* Section 5

* Section

6

* Section 7

* Section

8

Section

9

Section 10

*Section 11

Section 12

*Section 13

*Section 14

Section 15

Section 16

Section 17

*Section 18

*Section 19

Section 20

Section 21

*Section 22

Section 23

Section 24

Section 25

*Section 26

*Section 27

*Section 28

General ....•...•..•••...••...•...

1

Definitions . . . • . . . . • . . . . • . • . . • . . . • . . • . • .

1

Materials, Systems and Equipment . . . • • . • • . . . • . • .

4

wads. . • . . . • . . . • • . . . • • • • • • . . . • • . . • . . .

7

Room and Space Dimensions . . . • . . . . • .

11

Doors. • . . . • . . • • . . • . . . • • . . . • 15

Windows •••..•...•.•..•....•...•.•..•. 18

Stairs, Ramps, Handrails and Guards . • . . . • . . • . • .. 21

Means of Egress . . . • • . . • . . . .. 24

Fire Protection • . . . . • . . • • • . • . . . . • . . • . • . . • • . . . • • •. 30

Sound Control .•..•.•..•..•....•...••...••. 42

Excavation . . . • . . • . • . . • . • . . • • . . . • . . . . •. 43

Waterproofing and Dampproofing ...•. 44

Drainage . . . • . . . . • . . . . 45

Footings and Foundations ..••...•...••..•... 47

Siabs-on-Ground ..•....•...•... 51

Columns ...•....•...•... 52

Crawl Spaces .•..•. . . . • • . • . . • . . . • . • . • • . . . .. 53

Roof Spaces . . • . . • . • . . . • . . . . • . . . • .. 54

Above-Grade Masonry . . • . • . . . . • . . . . • . . . • . . . • . . • .. 55

Chimneys and Flues . . . • . . . • . . • . • . . • . . • . • . . •. 62

Fireplaces ...•.•...•...•....•..••.•.•• 65

Wood-Frame Construction . . . • . . . . • . . . .. 67

Post, Beam and Plank Construction ....•.. . . • . . • . . . .. 81

Sheet Steel Stud Wall Framing •..•... 83

Thermal Insulation and Vapour Barriers . . . • .. 85

Roofing ••...•.•••..•.•..••...•...••.•... 89

Siding •.•.••...•...•...•....•....•...••.••.• 96

*These Sections apply to all buildings of residential occupancy, regardless of size. The remaining Sections apply to residential buildings of not more than 6,000 sq ft in building area and of not more tban 3 storeys in building height unless otherwise specifically indicated in the Section.

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vi

*Section 29

* Section 30

* Section 31

*Section 32

*Section 33

Section 34

*Section 35

Section 36

*Section 37

* Section 38

*Section 39

*Section 40

Appendix A

Appendix B

Appendix C

AppendixD

Index

Stucco •...•...•...•...•.••...•....

Interior Wall and Ceiling Finishes ..•.•...•...•..

Flooring .•••...•.•.•.••...•••...••.•...•...•

Plumbing Facilities •.•.•.•...•...

Ventilation . . . • . • • . . . • . . . • • . . . .

Heating and Air.Conditioning ..•...•...•...•.

Electrical Facilities ...•...•...•...•....

Garages and Carports . • . . • . . • . • . • . • . . . • . • . . . .

Elevators ...•.•...••...•..•..••.••.•...

Painting ...•...•.•.•...••.

Walkways, Driveways and Parking Areas ...•.•.

Site Improvement ...••..•.•.•...

Fire and Sound Resistance •.••..•.•.•..••.•••.•.•

Span Tables for Wood Joists, Rafters and Beams ...•..

Span Tables for Wood Roof Trusses ••.••..••...•

Grade Markings of Canadian Lumber ...•.•.•

Page

102

105

III

114

117

119

125

126

127

128

129

131

135

145

187

195

201

·Tbese Sections apply to all buildings of residential occupancy, regardless of size. The remaining Sections apply to residential buildings of not more tban 6,000 sq ft in building area and of not more tban 3 storeys in bnilding beight unless otberwise specifically indicated in the Section.

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D

vii

PREFACE

The 1977 edition of Residential Standards replaces the 1975 edition. It has been prepared by the Standing Committee on Housing and Small Buildings, which is responsible to the Associate Committee on the National Building Code, under whose auspices this document was published.

Residential Standards contains the requirements for buildings of residential occupancy from Part 9 of the National Building Code of Canada 1977, which appear in bold-face type. It also con-tains requirements (in light-face type) going beyond the scope of the National Building Code, which are considered necessary to regulate residential construction under the National Housing Act. Where it has been necessary to change the wording of Part 9 requirements to reflect the broader scope of this document, this wording is shown in light-face type. Thus the document is not intended to be used to regulate construction under a municipal bylaw, and where the Part 9 requirements only are to be applied, reference should always be made to the National Building Code itself.

In general, the requirements in these Standards apply only to buildings up to 3 storeys in building height having a building area on any storey not exceeding 6,000 sq f1. For buildings exceeding these limits, the appropriate requirements in the National Building Code should be applied. There are exceptions, however, and these are stated at the beginning of each Section where applicable. For example, the requirements for room dimensions and sound resistance apply to all buildings, regardless of size.

The requirements in this document apply only to residential occupancies. Where buildings contain a major occupancy in addition to residential, the relevant requirements in the National Building Code for such combinations should be applied.

A pamphlet has been prepared to give appropriate metric values for the imperial units of meas-ure appearing in Residential Standards and is distributed automatically with each copy. It is intended to provide a basis for working in metric terms pending completion of a fully metric version of Resi-dential Standards in a subsequent edition.

Where changes or additions to the previous edition of this document have been made, the paragraphs affected have been indicated by vertical lines in the margin.

Comments, criticisms and suggestions for the improvement of these Standards are welcomed by the Associate Committee and will be given careful consideration. All communications with regard to the document should be addressed to: The Secretary, Associate Committee on the National Building Code, National Research Council of Canada, Ottawa, Ontario KIA OR6.

Le Code national du batiment, ses supplements et les documents qui s'y rattachent sont dis-ponibles en franl1ais. On peut se les procurer en s'adressant au Secretaire, Comite associe du Code national du batiment, Conseil national de recherches du Canada, Ottawa, Ontario KIA OR6.

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SECTION

1.

GENERAL

A. GENERAL

(I) This Standard applies to buildings classified as residential occupancy which, unless otherwise indicated herein, are 3 storeys or less in building height, and have a building area not exceeding 6,000 sq ft. (The following Sections of this Standard apply to all buildings of residential occupancy, regardless of size: Nos. 2, 5 to 8, II, 13,14,18,19, 22, 26 to 33, 35, and 37 to 40.) Where a building contains a mixed occupancy, the requirements of the National Building Code of Canada 1977 shall apply. This Standard applies both to site-assembled and factory-made buildings. (Children's custodial homes and convalescent homes for ambulatory occupants living as a single housekeeping unit in a dwelling unit with sleeping accommodation for not more than

to

(2) Measures to ensure the safety of the public during construction shall conform to the appropriate requirements in Part 8 of the National Building Code of Canada 1977. (3) Buildings other than those described in Sentence (I) are regulated by the appropriate

provisions contained in the National Building Code of Canada 1977.

(4) Where a building or a component of a building is assembled off the building site in such a way that it cannot be inspected on site, approved off-site inspection shall be provided when required by the authority having jurisdiction to ensure compliance with this Stand-ard.

( 5) Workmanship of a standard equal to good building practice shall be provided. (6) Where buildings are designed to accommodate handicapped persons, the requirements

in NBC Supplement No 5, "Building Standards for the Handicapped 1977" shall be used as a guide in addition to the requirements contained in this Standard.

SECTION 2.

DEFINITIONS

A. GENERAL

In this Standard

Approved means approved by the authority having jurisdiction or the appropriate authority having jurisdiction.

Bachelor dwelling unit means a dwelling unit for I or 2 adults with or without I bedroom.

Building means any structure used or intended for supporting or sheltering any use or occupancy.

Building area means the greatest horizontal area of a building above grade within the outside surface of exterior walls, or within the outside surface of exterior walls and the centre line of firewalls.

Building height (in storeys) means the number of storeys contained between the roof and the floor of the first storey.

Closure means a device for shutting off an opening through a construction assembly, such as a door or a shutter, and includes all components such as hardware, closing devices, frames and anchors.

Dead load means the weight of all permanent structural and non structural components of a building.

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2 SECTION 2

Dwelling unit means a room or suite of rooms operated as a housekeeping unit, used or intended to be used as a domicile by 1 or more persons and usually containing cooking, eat-ing, liveat-ing, sleeping and sanitary facilities.

Exit means that part of a means of egress that leads from the floor area it serves, including any doorway leading directly from a floor area, to a public thoroughfare or to an approved open space.

Exit, access to means that part of a means of egress within a floor area that provides access to an exit serving the floor area.

Exit, horizontal means that type of exit connecting 2 floor areas at substantially the same level by means of a doorway, vestibule, bridge or balcony, such floor areas being located either in different buildings or located in the same building and fully separated from each other by a firewall.

Exposing building face means that part of the exterior wall of a building which faces one direc-tion and is located between ground level and the ceiling of its top storey, or where a build-ing is divided into fire compartments, the exterior wall of a fire compartment which faces one direction.

Fire compartment means an enclosed space in a building that is separated from all other parts of the building by enclosing construction providing a fire separation having a required fire-resistance rating.

Fire-protection rating means the time in hours or fraction thereof that a closure, window assembly or glass block assembly will withstand the passage of flame when exposed to fire under specified conditions of test and performance criteria or as otherwise prescribed in this Standard.

Fire-resistance rating means the time in hours or fraction thereof that a material or assembly of materials will withstand the passage of flame and the transmission of heat when exposed to fire under specified conditions of test and performance criteria, or as determined by exten-sion or interpretation of information derived therefrom as prescribed in this Standard.

Fire separation means a construction assembly that acts as a barrier against the spread of fire and may not be required to have a fire-resistance rating or a fire-protection rating.

Fire stop means a draft.tight barrier within or between construction assemblies that acts to retard the passage of smoke and flame.

Fire stop /lap means a device intended for use in horizontal assemblies required to have a fire-resistance rating and incorporating protective ceiling membranes, which operates to close off a duct opening through the membrane in the event of a fire.

Firewall means a type of fire separation of noncombustible construction which subdivides a building or separates adjoining buildings to resist the spread of fire and which has a fire-re-sistance rating as prescribed in this Standard and has structural stability to remain intact under fire conditions for the required fire-rated time.

Flame-spread rating means an index or classification indicating the extent of spread-of-flame on the surface of a material or an assembly of materials as determined in a standard fire test as prescribed in this Standard.

Floor area means the space on any storey of a building between exterior walls and required firewalls, including the space occupied by interior walls and partitions, but not including exits and vertical service spaces that pierce the storey.

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-SECTION 2 3

Garage, storage means a building or part thereof intended for the storage or parking of motor vehicles and which contains no provision for the repair or servicing of such vehicles.

Gas vent (as applying to heating or cooling systems) means that portion of a venting system designed to convey vent gases vertically to the outside air from the vent connector of a gas-fired appliance, or directly from the appliance when a vent connector is not used, and includes any offsets.

Grade (as applying to the determination of building height) means the average level of finished ground adjoining a building at all exterior walls, as determined by the authority having jurisdiction (see Storey, first).

Guard means a protective barrier around openings in Hoors or at the open sides of stairs, land-ings, balconies, mezzanines, galleries, raised walkways, or other locations to prevent acci-dental falls from one level to another. Such barrier mayor may not have openings through it.

Heavy timber construction means that type of combustible construction in which a degree of fire safety is attained by placing limitations on the sizes of wood structural members and on thickness and composition of wood Hoors and roofs, by avoidance of concealed spaces under Hoors and roofs, and by use of approved fastenings, construction details and adhesives for structural members.

Horizontal service space means a space such as an attic, duct, ceiling, roof or crawl space ori-ented essentially in a horizontal plane, concealed and generally inaccessible, through which building service facilities such as pipes, ducts and wiring may pass.

Limiting distance means the distance from an exposing building face towards a property line, the centre line of a street, lane, public thoroughfare or an imaginary line between 2 build-ings on the same property, measured at right angles to the exposing building face.

Live load means the load other than dead load to be assumed in the design of the structural members of a building. It includes loads resulting from snow, rain, wind, earthquake and those due to occupancy, including movable partitions.

Loadbearing (as applying to a building element) means subjected to or designed to carry loads in addition to its own dead load, excepting a wall element subjected only to wind or earth-quake loads in addition to its own dead load.

Means of egress means a continuous path of travel provided by a doorway, hallway, corridor, exterior passageway, balcony, lobby, stair, ramp or other egress facility or combination thereof, for the escape of persons from any point in a building, Hoor area, room or con-tained open space to a public thoroughfare or other approved open space. (Means of egress includes exits and access to exits.)

Noncombu.5tible (as applying to an elementary building material) means that such material conforms to lILC-SIl4-1975, "Standard Method of Test for Determination of Non-Com-bustibility in Building Materials."

Noncombustible construction means that type of construction in which a degree of fire safety is attained by the use of noncombustible materials for structural members and other building assemblies.

Occupancy means the use or intended use of a building or part thereof for the shelter or sup-port of persons, animals or property.

Occupancy, major means the principal occupancy for which a building or part thereof is used or intended to be used, and shall be deemed to include the subsidiary occupancies which are an integral part of the principal occupancy.

Occupant load means the number of persons for which a building or part thereof is designed.

Partition means an interior wall, 1 storey or part-storey in height, that is not Joadbearing.

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4 SECTION 2

Public building means a building to which the public is admitted, but does not include

apart-ment buildings, houses or boarding houses.

Public corridor means a corridor that provides access to exit from individually owned or rented

rooms, suites of rooms or dwelling units.

Residential occupancy means the occupancy or use of a building or part thereof by persons for

whom sleeping accommodation is provided but who are not harboured or detained to receive medical care or treatment or are not involuntarily detained.

Service room means a room or space provided in a building to accommodate building service

equipment such as air-conditioning or heating appliances, electrical services, pumps, com-pressors and incinerators.

Senice space means space provided in a building to facilitate or conceal the installation of

building service facilities such as chutes, ducts, pipes, shafts or wires.

Service water heater means a device for heating water for plumbing services.

Sprinklered (as applying to a building or part thereof) means that the building or part thereof is

equipped with a system of automatic sprinklers.

Storey means that portion of a building which is situated between the top of any ftoor and the

top of the ftoor next above it, and if there is no ftoor above it, that portion between the top of such ftoor and the ceiling above it.

Storey, first means the lowest storey having its ceiling more than 6 ft above grade.

Unprotected opening (as applying to exposing building face) means a doorway, window or

opening other than one equipped with a closure having the required fire-protection rating, or any part of a wall forming part of the exposing building face that has a fire-resistance rat-ing less than required for the exposrat-ing buildrat-ing face.

Wall, party means a wall jointly owned and jointly used by 2 parties under easement agreement

or by right in law and erected at or upon a line separating 2 parcels of land each of which is, or is capable of being, a separate real-estate entity.

B. OTHER DEFINITIONS

For words not defined in Subsection A, the definitions in Part 1 of the National Building Code of Canada 1977 shall apply.

SECTION 3.

MATERIALS, SYSTEMS AND EQUIPMENT

A. GENERAL

(1) Materials, systems and equipment shall possess the essential properties to perform their intended functions.

(2) When required by the authority having jurisdiction, materials, systems or equipment shall be tested to determine the suitability for the intended use.

(3) Except as provided in (5), the test method used to determine the suitability of materials, systems or equipment shall be one that is published by a recognized agency.

(4) Materials, systems and equipment not specifically described herein, or which vary from the specific requirements in this Standard, or for which no recognized test procedure has been established, may be used if it can be shown that the material, system or equipment is suitable on the basis of past performance, or good engineering practice or on the basis of tests described in Sentence (5).

(5) Where no published test method exists, the tests shall be designed to simulate or exceed anticipated service conditions or shall be designed to compare the performance of the material, system or equipment with similar material, system or equipment that is known to be acceptable.

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SECTION 3 5

(6) Every test shall be carried out by a testing laboratory acceptable to the authority having jurisdiction.

(7) When a specification or reference document listed herein contains requirements that conHid with specific requirements in this Standard, the requirements in this Standard shall govern.

(8) Unless otherwise specified herein, the documents referenced in this Standard shall refer to those current as of 30 June, 1976 together with all relevant amendments, revisions and supplements effective to that date.

B. CONCRETE

(I) Concrete shall be designed, mixed, placed and cured in accordance with CSA A23.1-1973, "Concrete Materials and Methods of Concrete Construction" and tested in accord-ance with CSA A23.2-1973, "Methods of Test for Concrete."

(2) Cement shall meet the requirements of CSA AS-1971, "Portland Cements." Sulphate-re-sisting cement shall be used for concrete in contact with sulphate soil deleterious to normal cement. Such concrete shall conform to the requirements in Section 25 of CSA A23.1-1973, "Concrete Materials and Methods of Concrete Construction."

(3) Aggregates shall consist of sand, gravel, crushed rock, crushed air-cooled blast furnace slag, expanded shale or expanded clay, conforming to CSA A23.1-1973, "Concrete Mate-rials and Methods of Concrete Construction." Aggregate shall be clean, well-graded and free of injurious amounts of organic and other deleterious material.

(4) Water shall be clean and free of injurious amounts of oil, organic matter, sediment or any other deleterious material.

(5) Unless otherwise specifically required elsewhere in this Standard, the compressive strength of unreinforced concrete shall be not less than 2,000 psi after 28 days.

(6) When concrete is used for garage and carport Hoors and exterior steps, it shall have a minimum compressive strength of 3,000 psi after 28 days and shall have air entrainment of 5 to 7 per cent.

(7) The concrete mixes described in Table 3A shall be considered acceptable if the slump does not exceed 4 in. when measured according to the slump test described in CSA A23.2-1973, "Methods of Test for Concrete."

TABLE 3A - CONCRETE MIXES BY VOLUME

!

Concrete Cement, Sand,

Strength, psi part parts Coarse Aggregate< I) I

2,000 2 4 parts

I

_-

1

-

Column I 2 3 4

Note to Table 3A:

( I) Size of aggregate shall Dot exceed 2 io.

(8) The use of admixtures other than those for air entrainment shall be subject to the approval of the authority having jurisdiction. Admixtures shall conform to CSA A266.I-1973, "Air-Entraining Admixtures for Concrete" or CSA A266.2-A266.I-1973, "Chemical Admixtures for Concrete" as applicable.

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6 SECTION 3

(9) Reinforced concrete shall be designed to conform to the requirements of Part 4 of the National Building Code of Canada 1977.

(10) When the air temperature is below 40°F, concrete shall be kept at a temperature of not less than 50° F or more than 80° F while being mixed and placed, and maintained at a temperature of not less than 50°F for 72 hr after placing. No frozen material or ice shall be used in the mix.

C. Ll'MBER AND WOOD PRODUCTS

(1) Lumber for the uses listed in Table 3B shall be identified by the grade stamp of an associ-ation or independent grading agency approved to grade stamp lumber by an appropriate organization acceptable to the authority having jurisdiction.

TABLE 3B-MINIMUM LUMBER GRADES FOR SPECIFIC END USES (1)

BOARDS FRAMING

Paragraph in the 1970 NLGA grading rules 24 24

under which boards are graded!l) in. thick in. thick

USE 2.5 6in.

Eastern _{in. wide} and wider

All species white pine

& red pine _{All All}

Para 111 Para 113 Para 114 Para 115 Species Species

Stud wall framing - - -

-

(Ioadbearing members) Stud,

No.2

Stud wall framing

-

(non.loadbearing members) Utility,

No.3

Floor. roof & ceiling framing

_-

_-

_-

Plank frame coostruction Standard No.3 No.3 No.2

(Ioadbearing members) Common

Plank frame construction Economy No.5 No.5 Economy, Economy.

(non.loadbearing members) Common No.3 No.3

Posts and beams

_-

No.

2(";

No.

2(4,1

Roof sheathing Standard No.3 Standard No.4

-

-Common

Sub.flooring Standard No.3 Standard No.3

-Common

Wall sheathing (~) Utility No.4 Utility No.4

-Common

Column I 2 3 4 5 6 7

Notes to Table 3B:

(i) Graded in conformance with the 1970 NLGA Standard Grading Rules for Canadian Lumber, published by the

National Lumber Grades Authority, Vancouver.

i21 To identify board grades, the paragraph number of the NLGA rules under which the lumber is graded must be shown in the grade mark. The grade descriptions in Paragraph 113 of the NLGA rules are the same as the 1970 Standard Grading Rules for Western Lumber published by WWPA. The grade descriptions in Paragraph 114 are the same as the 1970 Standard Grading Rules for West Coast Lumber, No. 16, published by WCLlB. When graded in accordance with WWPA or WCLlB rules, the grade mark will not contain a paragraph number. (31 Grades to conform to those listed in "Span Tables for Wood Joists, Rafters and Beams," in Appendix B (see

Articles 23E (14) to (16) for roof trusses).

14) Where 5 in. or thicker lumber is used for posts or beams, the grade shall be not less than "Standard." ()) Where wall sheathing is not required as a nailing ba'ie, I grade lower than those specified is permitted.

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SECTION 3 7

(2) Exterior type particleboard and plywood used for roof sheathing, wall sheathing and subflooring shall be legibly identified on the face of the material indicating the manufac-turer of the material, the standard to which it is produced and that the material is of exte-rior type.

(3) Lumber grades shall conform to Table 3B for the particular use. On-site cross-cutting of a piece shall not be considered to affect the grade ofthe piece as originally marked. (4) Moisture content of lumber shall be not greater than 19 per cent at the time of

installa-tion.

(5) Lumber dimensions of less than 1 in. referred to in this Standard are actual dimensions. Lumber dimensions of 1 in. or more referred to in this Standard are nominal dimensions. The corresponding actual dimensions shall be those shown in CSA 0141-1970, "Softwood Lumber."

(6) Joist, rafter, lintel and beam members up to 5 per cent less than the actual Canadian standard sizes may be used provided the allowable spans for the grade and species of lum-ber under consideration are reduced 5 per cent from those shown in the span tables for full size members.

(7) Where wood is pressure treated to resist termites, such treatment shall be in accordance with the requirements of one of the following standards:

CSA 080.1-1974, "Preservative Treatment of All Timber Products by Pressure Processes,"

CSA 080.2-1974, "Preservative Treatment of Lumber, Timber, Bridge Ties and Mine Ties by Pressure Processes,"

CSA 080.9-1974, "Preservative Treatment of Plywood by Pressure Processes," or CSA 080.15-1974, "Preservative Treatment of Wood for Building Foundation Systems,

Basements and Crawl Spaces by Pressure Processes."

D. METAL

Minimum thicknesses for sheet metal material given in this Standard refer to the actual minimum thicknesses measured at any point of the material, and in the case of galvanized steel, includes the thickness of the coating unless otherwise indicated.

SECTION 4.

LOADS

A. GENERAL

When the size of structural members and their connections are not given in this standard, the members and their connections shall conform to Part 4 of the National Building Code of Canada 1977, except that design live loads and deflection limits shall conform to Subsections B to F.

B. FLOOR LOADS

The minimum design live load on a floor area is the load listed in Table 4A applied uni-formly over the entire area, or the load listed in Table 4B applied over an area of 211z ft by 2Yz ft located so as to cause maximum effects, whichever causes the greater stresses.

TABLE 4A-UNIFORM DESIGN LOADS FOR FLOORS

Use of Area of Floor Minimum Design

I

Live Load, psf Corridors, lobbies and aisles over 4 ft in width, except for public

corri-dors above the first storey in residential occupancies 100 Public corridors above the first storey in residential occupancies 40 Corridors, lobbies and aisles not over 4 ft in width (i)

Balconies 100 Column 1 2

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-~.-8 SECTION 4

TABLE 4A-UNIFORM DESIGN LOADS FOR FLOORS (Cont'd)

Use of Area of Floor Minimum Design

Live Load, psf

Equipment rooms 75(2)

Exits 100

Garages

for passenger cars 50

for unloaded buses and light trucks 125

for loaded trucks and buses and all trucking spaces 250 Kitchens

other than domestic type 100

Residential occupancies

attics not accessible by a stairway 10

attics accessible by a stairway 30

bedrooms 30

all other rooms 40

stairs within dwelling units 75

Driveways(3) 250

Sidewalks(3) adjacent to driveways that may be subject to loads from

cars or trucks 250

Walks(3) that will not be subject to loads from cars or trucks 100

Storage areas 100(2)

Column 1 2

Notes to Table 4A.:

(I) Corridors, lobbies and aisles not over 4 ft in width shall be designed to carry not less than the design load

re-quired for the occupancies they serve.

(2) Total equipment loads must be calculated and allowed for in the design.

!3J Applies to driveways, sidewalks or walks that are not supported by the ground, such as those over basements or cellars.

TABLE 4B-CONCENTRATED DESIGN LOADS FOR FLOORS Minimum

Use of Area of Floor Concentrated

Design Load, Ib

Floors and areas used by passenger cars 2,500

Floors and areas used by vehicles not exceeding 8,000 lb gross weight and walks not subject to vehicular traffic over basements, cellars or

other open areas 4,000

Floors and areas used by vehicles exceeding 8,000 Ib but not exceeding

20,000 Ib gross weight 8,000

Floors and areas used by vehicles exceeding 20,000 Ib gross weight 12,000 Driveways or sidewalks adjacent to driveways over basements, cellars, !

I

I

I or other open areas 12,000

Column 1 2

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w

SECTIO~ 4 9

C. SNOW LOADS

(1) Except as provided in (2), (3) and (4), design snow loads shall be not less than 60 per cent of the appropriate ground snow load listed in NBC Supplement No.1, "Climatic Informa-tion for Building Design in Canada 1977," but in no case shall the snow load be consid-ered less than 20 psf of horizontal roof projection.

(2) Where the entire width of a roof does not exceed 14 ft, the design snow load shall not be less than 50 per cent of the appropriate ground snow load listed in NBC Supplement No. 1, "Climatic Information for Building Design in Canada 1977," but in no case less than 20 psf of horizontal roof projection.

(3) Bow string, arch or semi-circular roof trusses having an unsupported span greater than 20 ft, steel or wood roof framing members having an unsupported span greater than 40 ft or a spacing greater than 2 ft and reinforced concrete roof slabs shall be designed in confor-mance with the snow load requirements in Section 4.1 of Part 4 of the National Building Code of Canada 1977.

(4) Except for roofs of wood-frame construction, roofs of buildings shall be designed in con-formance with the snow·load requirements in Section 4.1 of Part 4 of the National Build-ing Code of Canada 1977 where the greatest horizontal area of the buildBuild-ing above grade, measured within the exterior surfaces of the exterior walls, exceeds 6,000 sq ft.

D. WIND LOADS

Design wind loads shall conform to the appropriate requirements in Section 4.1 of Part 4 of the National Building Code of Canada 1977.

E. DEFLECTIONS

The maximum deflection of structural members shall conform to Table 4C. Dead loads need not be considered in computing such deflections.

TABLE 4C-MAXIMUM DEFLECTIONS

Type of Ceiling Maximum Allowable Structural Members _Supported Deflection Expressed as

a Ratio of the Clear Span

No ceiling 1/180

Roof rafters, roof joists, roof

Other than plaster or beams and roof decking of plank

and beam construction gypsum board 1/240 Plaster or gypsum board 1/360

Other than plaster or

Ceiling joists gypsum board 1/240

Plaster or gypsum board 1/360

No ceiling 1/360

Floor beams, floor joists and floor

decking of plank and beam con· Other than plaster or

struction for floor areas other gypsum board 1/360 than bedrooms in dwelling units

Plaster or gypsum board 1/360 Floor beams, floor joists and floor No ceiling 1/240

decking of plank and beam con· Other than plaster or

struction for floor areas of bed· gypsum board 1/240

rooms in dwelling units

Plaster or gypsum board 1/360

Column 1 2 3

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10 SECTION 4

F. EARTHQUAKE LOADS

(1) Except for buildings of wood-frame construction, buildings shall be designed for the earthquake loads in Section 4.1 of Part 4 of the National Building Code of Canada 1977 where the greatest horizontal area of the building above grade, measured within the exte-rior surfaces of the exteexte-rior walls, exceeds 6,000 sq ft.

(2) Except as provided in (3) to (5), 2- and 3-storey buildings in seismic Zone 3 and 3-storey buildings in seismic Zone 2 shall be designed for the earthquake loads in Section 4.1 of Part 4 of the National Building Code of Canada 1977 where the greatest horizontal area of the building above grade, measured within the exterior surfaces of the exterior walls, does not exceed 6,000 sq ft.

(3) Buildings with structuralloadbearing precast concrete elements (normal or light-weight) shall have connections designed for the earthquake loads in Section 4.1 of Part 4 of the National Building Code of Canada 1977.

(4) Buildings constructed with loadbearing masonry walls which are required to resist the earthquake loads in (1) and (2) may in lieu of engineered design be reinforced as required in Subsection 20 R.

(5) Buildings with structural systems of wood frame construction need not be designed for the earthquake loads in Section 4.1 of Part 4 of the National Building Code of Canada 1977.

G. BEARING CAPACITY FOR SOIL AND ROCK

(1) Except as provided in (2) to (4) and Section 15, where the footing width does not exceed 3 ft, the allowable bearing pressure for soil or rock shall be determined in conformance with ASTM 01194-72, "Bearing Capacity of Soil for Static Load on Spread Footings," provided the bearing plate used in the test is at least 12 in. by 12 in. and the allowable bearing pressure does not exceed '13 the ultimate bearing capacity of the soil or rock, and does not exceed '13 the pressure that would cause the plate to settle 1 in.

(2) Where a foundation rests on rock or on soil that has been identified in conformance with the "Guide to the Field Description of Soils," published by the Associate Committee on Geotechnical Research, National Research Council of Canada, to the satisfaction of the authority having jurisdiction to a depth equal to at least twice the width of the footing, the values in Table 40 may be used in determining the allowable bearing pressures for soil or rock.

(3) Where a soil or rock within a distance equal to twice the footing width below the bearing surface has a lower allowable bearing pressure than that at the bearing surface as shown in (2), the design capacity of the foundation shall not be greater than would cause the weakest soil or rock to be stressed beyond its allowable bearing pressure. In calculating such subsurface pressures, the loads from the footings shall be assumed to be distributed uniformly over a horizontal plane within a frustrum extending downward from the footing at an angle of 60 deg. to the horizontal.

(4) Where a foundation bears on gravel, sand or silt and where the water table is within a dis-tance below the bearing surface equal to the width of the foundation, the allowable bear-ing pressure shall be 50 per cent of that determined in (1) and (2).

(5) The design procedures described in Section 4.2 of Part 4 of the National Building Code of Canada 1977 may be used in lieu of the design procedures in this Subsection, and shall be used where deep foundations are used, or if the footing size falls outside the scope of this Section, or if the foundation is constructed on peat or on filled ground.

(6) Where a foundation is located in an area in which soil movement caused by changes in soil moisture content is known to occur to the extent that it will cause significant damage to a building, approved measures shall be taken in conformance with good practice to minimize the effect of such movement on the building.

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SECTION 4 11

(7) Walls shall be designed to resist the lateral pressure of the retained material in accord-ance with accepted engineering practice. Walls supporting drained earth may be designed for pressure equivalent to that exerted by a fluid weighing not less than 30 Ibl cu ft and having a depth equal to that of the retained earth. Any surcharge shall be in addition to the equivalent fluid pressure.

TABLE 4D-ALLOW ABLE BEARING PRESSURES FOR SOIL AND ROCK Type and Condition of Soil or Rock Maximum Allowable

Bearing Pressure, psf Dense sand, dense sand and gravel(\) 6,000

Compact sand, compact sand and gravel( I) 3,000

Loose sand, loose sand and gravel( I) 1,000

Dense silt(2) 3,000

Compact silt(2) 2,000

Very stiff clay(2) 6,000

Stiff claym 3,000

Firmclay(2) 1,500

Soft clay(2) 7SO

Till, dense or hard 8,000

Till, compact or firm 3,000

Cemented sand and gravel 10,000

Clay shale 6,000

Sound rock 10,000

Column 1 2

Notes to Table 4D:

(I) Sand or sand and gravel may be classified by means of a picket test in which a 2 in. by 2 in. picket bevelled at the end at 45 deg. to a point is pushed into the soil. Such material is classified as "dense" if a man of average weight cannot push the picket more than I'll in. into the soil, "compact" if the picket penetrates more than I'll in. but less than 8 in. into the soil and "loose" if the picket penetrates 8 in. or more.

(2) Clay and cohesive silts may be classified as "very stiff" if it is impossible to indent by thumb pressure, "stilf" if it is difficult to indent by thumb pressure, "firm" if it can be Indented by moderate thumb pressure, "sort" if it can be penetrated several inches by thumb pressure, where this test is carried out on undisturbed soil in the wall of a test pit.

SECTION S.

ROOM AND SPACE DIMENSIONS

A.

GENERAL

(I) This Section applies to all buildings regardless of size.

(2) This Section applies only to dwelling units that are intended for use on a continuing or year-round basis as the principal residence of the occupant.

(3) Unless otherwise indicated herein, the areas, dimensions and heights of rooms or spaces shall be measured between finished wall surfaces and between finished floor and ceiling surfaces.

(4) Minimum dimensions listed for rooms or spaces in combination with other rooms or spaces refer to the minimum dimension of the combined space.

(5) Minimum floor areas specified in this Section do not include closets or built-in bedroom cabinets unless otherwise indicated.

(6) Two or more areas are considered as a combination room if the dividing wall occupies less than 60 per cent of the separating plane.

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12 SECTION 5

(7) Areas and dimensions of rooms or spaces may be less than required in this Section pro-vided it can be shown to the satisfaction of the authority having jurisdiction that the rooms or spaces are adequate for their intended use, such as by the provision of built-in furniture to compensate for the reduced sizes.

B. CEILING HEIGHTS

(l) Heights of rooms or spaces shall conform to Table SA.

TABLE SA-ROOM HEIGHTS

Room or Space Minimum Heights

Living room or space 7 ft 6 in. over at least 7S per cent of the required Dining room or space floor area with a clear height of 7 ft at any point Kitchen or kitchen space over the required area

Bedroom or bedroom space 7 ft 6 in. over at least 50 per cent of the required floor area or 7 ft over all of the required floor area. Any part of the floor having a clear height of less than 4 ft 6 in. shall not be considered in computing the required floor area

Unfinished basement or cellar includ- 6 ft 4 in. under beams in laundry areas and in any 10-ing laundry area therein cation that would normally be used for passage to

laundry and required storage areas

Bathroom, water-closet room or laun- 7 ft in any area where a person would normally be in dry area above grade a standing position

Passage, hall or main entrance vesti- 7 ft bule and finished rooms not specifi-cally mentioned above

Column 1 2

(2) The clear height above and below a mezzanine floor assembly shall be not less than 7 ft, unless otherwise permitted by the authority having jurisdiction.

(3) The clear height in a storage garage shall be not less than 6 ft 6 in.

C. LIVING ROOMS OR SPACES WITHIN DWELLING UNITS

Living areas within dwelling units, either as separate rooms or in combination with other spaces, shall have at least 14S sq ft of floor area and shall have no dimension less than 9 ft 10 in. within the required area. Where the area of a living space is combined with a kitchen and dining area, the living area alone in a bachelor dwelling unit shall be at least 120 sq ft.

D. DINING ROOMS OR SPACES WITHIN DWELLING UNITS

(1) A dining space in combination with other space shall have a minimum floor area of 35 sq ft. Dining rooms not combined with other space shall have a minimum area of 7S sq ft. (2) Except as permitted in (3), a dining room or space combined with other space shall have

no dimension less than 7 ft 6 in. within the required area measured between wall faces or a wall face and a built-in cabinet or appliance.

(3) When a required dining area is provided in a kitchen or serves a bachelor dwelling unit, the minimum dimension of such space may be reduced to S ft 6 in.

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SECTION 5 13

E.

KITCHENS WITHIN DWELLING UNITS

(1) Kitchen areas within dwelling units, either separate from or in combination with other space, sball bave at least 45 sq ft of floor area including tbe area occupied by tbe base cab-inets, except that in bacbelor dwelling units the minimum floor area sball be 40 sq ft.

(2) At least 3 ft clearance shall be provided in front of base cabinets, work surfaces, counter tops and appliances.

(3) Except as provided in (4), every dwelling unit shall have a kitchen counter at least I ft

10 in. in depth providing at least 14Y2 sq ft of work surface, including the area occupied by the sink, and 6 lineal feet of cabinet front. Counter work surface depth greater than

I ft 10 in. shall not be included in calculating the required area.

(4) Every bachelor dwelling unit shall have a kitchen counter at least I ft 10 in. in depth providing at least 11 sq ft of work surface, including the area occupied by the sink, and 3 lineal feet of cabinet front. Counter work surface depth greater than 1 ft. 10 in. shall not be included in calculating the required area.

(5) In bachelor dwelling units, the shelf area required in (6) may be reduced to 16 sq ft, with 12 sq ft of this area to be at least 11 in. in depth, and with at least 91h in. min. clearance between shelves.

(6) In addition to the base cabinets described in (3), at least 22 sq ft of shelf area not more than 6 ft 6 in. above the floor shall be provided. Sixteen square feet of this area shall be at least 11 in. in depth with at least 91f2 in. clearance above the shelves. The remaining 6 sq ft shall have a depth of at least 5 in. with at least 5 in. clearance above the shelf. The maximum depth for computing shelf areas shall be 11 in.

F.

BEDROOM OR SPACE IN DWELLING UNITS

(1) Except as provided in (3), at least 1 bedroom in every dwelling unit sball bave at least 105

sq ft of floor area wbere built-in cabinets are not provided and 95 sq ft of floor area wbere built-in cabinets are provided. The minimum dimension within the required area shall be

8 ft 10 in.

(2) Except as provided in (3), additional bedrooms sball bave at least 75 sq ft of floor area where built-in cabinets are not provided and 65 sq ft of floor area where built-in cabinets are provided. The minimum dimension witbin tbe required area sball be 6 ft 6 in. (3) Bedroom spaces in combination with otber spaces shall bave at least 45 sq ft of floor area

and bave no dimension less tban 6 ft 6 in. within tbe required area.

G.

BUILT-IN BEDROOM CABINETS

(I) A built-in cabinet in the first bedroom shall provide at least 27 cu ft of storage within 5

ft of the floor when the bedroom is less than 105 sq f1.

(2) A built-in cabinet in other than the first bedroom shall provide at least 131h cu ft of storage within 5 ft of the floor when the bedroom area is less than 75 sq f1.

(3) Built-in cabinets shall consist of shelves with door fronts or drawers.

(4) When required cabinet storage is by means of shelves, at least 27 sq ft shall be provided for the first bedroom and 131h sq ft for additional bedrooms. Shelves shall be at least 12 in. but not more than 18 in. in depth. The distance between shelves shall be not less than 1f2 the depth.

(5) When required cabinet storage is provided by drawers, the drawers shall be not more than 48 in. wide, not more than 12 in. in height and not more than 24 in. in depth.

H.

COAT AND CLOTHES CLOSETS

(l) At least 1 clothes closet shall be provided in each bedroom.

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14 SECTION 5

(2) At least I coat closet shall be provided convenient to an entrance.

(3) Coat and clothes closets shall have at least 6 sq ft of floor area. At least 50 per cent of the required area shall be horizontal and not more than 12 in. above the room floor lev-el. Such closets shall have a minimum height of 6 ft 6 in. over the required floor area. (4) Walk-in closets shall have at least 6 ft 6 in. head room over the required area.

(5) Coat and clothes closets shall be at least I ft 10 in. deep when the width of the opening is at least I ft 9 in., and at least I ft 2 in. deep when the opening is 4 ft wide or more. (6) A shelf not less than I I in. deep with a clearance of not less than 8 in. above it shall be

provided in coat and clothes closets.

I. LINEN CLOSETS

(I) A linen closet shall be provided in each dwelling unit and shall have a shelf area of not less than 6 sq ft for 1- and 2-bedroom dwelling units. Two square feet of additional shelf area shall be provided for each additional bedroom.

(2) The maximum depth of shelf to be used in calculating the shelf area shall be 2 ft. (3) Shelves shall have not less than I ft 2 in. depth, I ft 6 in. width and 12 in. clearance

above shelves.

J. BATHROOM AND WATER-CLOSET ROOMS

(1) In every dwelling unit, an enclosed space of sufficient size shall be provided to accommo-date a bathtub, water closet and lavatory.

(2) A janitor's toilet room shall be provided adjacent to the boiler room (or other work room) in an apartment building when a dwelling unit is not provided for the janitor. (3) At least I ft 9 in. clearance shall be provided in front of the tub or shower stall to an

opposite wall face or I ft 6 in. in front to another fixture, over at least a 2 ft length of the bathtub or shower.

(4) The centreline of the water closet shall be at least I ft 3 in. away from an adjacent side wall and from a vanity. At least I ft 6 in. clearance shall be provided in front of the water closet to the opposite wall or another fixture.

(5) The centreline of a lavatory shall be at least 1 ft 3 in. from an adjacent side wall. At least I ft 9 in. clearance shall be provided in front of the lavatory to an opposite wall or I ft 6 in. clearance in front to another fixture.

(6) A mirror not less than 12 in. by 18 in. in size shall be installed over each lavatory in bathrooms and wash rooms. Such mirrors shall conform to Type I B-polished plate or float glass for high-humidity use in CGSB 12-GP-5a (1970), "Mirrors; Silvered," and shall be so labelled.

(7) Wall cabinets shall be at least 9 in. in height or width and be at least 1112 sq ft in overall size. Cabinets shall be equipped with shelves. Where wall cabinets are not provided, equivalent shelf space shall be provided in a lockable vanity.

(8) Except for bachelor dwelling units, at least I bathroom access that does not enter through a bedroom shall be provided to the required bathroom.

K. HALLWAYS

(1) The width of a hallway within a dwelling unit shall be at least 2 ft 10 in., except that in buildings not exceeding 14 ft in width, the hallway width may be 2 ft 4 in. where a second exit is provided near the end of the hallway farthest from the living area.

(2) The width of a main vestibule shall be at least 3 ft 6 in.

L. LAUNDRY AND LAUNDRY SPACE

(I) A clearance of at least 3 ft shall be provided at the front of an automatic washer or dryer. ~ . . __

._--,

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SECTION 5 15

(2) Where automatic dryers are not provided, space shall be provided for not less than 100 lineal feet of indoor clothes line for each dwelling unit when the laundry facilities are not shared, or for each 20 dwelling units or fraction thereof when laundry facilities are shared.

(3) Where automatic washers are not provided, laundry areas either separate or in combi-nation with other space of at least 35 sq ft of floor area with a 5 ft minimum dimension shall be provided for each dwelling unit when laundry facilities are not shared, or for each 20 dwelling units when laundry facilities are shared.

M. GENERALSTORAGE

(I) Except as provided in (2) and (3), every dwelling unit shall have at least 200 cu ft of storage plus at least 75 cu ft for each bedroom. Such storage space shall have at least 6

ft height over at least 50 per cent of the required space and at least 4 ft height over the remainder of the required space. At least 50 per cent of such required storage space shall be heated. Required storage space shall be separate from finished areas, and access to such storage space shall be independent from other dwelling units.

(2) In a building equipped with an elevator, at least 200 cu ft of storage conforming to the requirements in (I) shall be provided for each dwelling unit.

(3) Where a portion of the required storage space consists of communal storage as described in (4), the required independent storage space for each dwelling unit may be reduced to 150 cu ft for a dwelling unit with not more than I bedroom plus 30 cu ft for each additional bedroom. Such storage space shall be at least 6 ft in height and at least 3 ft in width and depth. When located within a dwelling unit such storage shall be sepa-rated from other space. When located outside a dwelling unit the storage space for each dwelling unit shall be in a separate lockable enclosure with direct and convenient access.

(4) Communal storage referred to in (3) shall consist of at least 60 sq ft when such storage serves not more than 10 dwelling units plus an additional 6 sq ft for each dwelling unit in excess of 10, except that such storage need not exceed 240 sq ft.

SECTION 6.

DOORS

A. GENERAL

(1) This Section applies to all buildings regardless of size.

(2) Requirements relating to doors in fire separations and means of egress shall conform to the appropriate requirements in Sections 9 and 10.

(3) Thresholds in the access routes required in Subsection 98 to be constructed to accom-modate physically handicapped persons shall be not greater than V2 in. in height, and shall be sloped to facilitate the passage of wheelchairs.

B. REQUIRED DOORS

(1) A door shall be provided at each entrance to a dwelling unit, bathroom, water-closet room, shower room and room containing a boiler or furnace.

(2) In buildings containing more than 1 dwelling unit, doors shall be provided at the exterior entrances, laundry or drying rooms, storage rooms, public water-closet rooms, garbage and incinerator rooms, furnace rooms, recreation rooms and any other locations required by Section 10.

(3) A door shall be provided at each entrance to a bedroom and a room containing a water pump.

C. DOORWAY SIZES

(1) Doorway openings within dwelling units shall be designed to accommodate not less than the door sizes in Table 6A for swing4ype doors. Where folding doors are to be provided, the same openings apply.

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16 SECflON 6

TABLE 6A - MINIMUM SIZE OF DOORS

At Entrance to Width, Height,

ft-in. ft-in. Dwelling unit (required entrance)

2-8 6-6

Vestibule or entrance hall

I Stairs to a Ooor level that contains a finished space

All doors in at least 1 line of passage from the exterior to the _{2-8 6-6} basement

UtiJity rooms I

Walk-in closet 2-0 6-6

Bathroom, water-closet room, shower room 2-()(l) 6-6 I Rooms not mentioned above, exterior balconies 2_()(2) 6-6

Column 1 2 3

Notes to Table 6A:

(\) In buildings required by Subsection 98 to accommodate physically handicapped persons, doors shall be at least 2 ft 6 in. in width.

(2) Wbere 2 rt 4 in. hallways are permitted doors may be 2 ft wide.

(2) Doors to public water-closet rooms shall be not less than 2 ft 8 in. in width and 6 ft 8 in. in height.

(3) Doorways through which access is required in Subsection 9B to facilitate the passage of wheelchairs shall provide a clear opening with the door in the open position of at least 2 ft. 6 in. in width.

D.

INTERIOR WOOD DOORS

(1) The construction of interior doors shall conform to CSA 0132.2-1972, "Wood Doors." (2) Interior wood doors in dwelling units other than closet doors or cupboard doors shall

be at least I ¥s in. thick.

(3) Interior wood doors to rooms or spaces used for storage, laundry, drying, vestibules, recreation or water closets in apartment buildings but not within dwelling units shall be at least 1% in. thick.

E.

EXTERIOR DOORS

(1) Exterior wood doors shall be exterior type conforming to CSA 0132.2-1972, "Wood Doors."

(2) All sliding glass doors shall conform to the appropriate requirements in CGSB 82-GP-la (1972), "Doors, Glass, Aluminum Frame, Sliding Standard-Duty" or to CGSB 82-GP-2a (1972), "Doors, Glass, Aluminum Frame, Sliding, Medium-Duty."

(3) Exterior wood doors shall be at least 1% in. thick, except that doors for secondary entrances serving single dwelling units or balconies may be I ¥s in. thick if of solid wood, solid core or stile and rail construction.

(4) Storm or combination doors shall be at least I ¥s in. thick for wood doors and I in. for metal doors.

(5) Weatherstripping of metal, plastic, rubber, wood or fabric or combination of these materials shall be installed at the perimeter of all exterior door openings.

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...

SECTION 6 17

(6) Where an exterior door opening is not completely protected from wind blown snow or rain, it shall be provided with a sill that slopes to the exterior and the sill caulked with suitable caulking to prevent the entry of water.

(7) Wood door frames shall be one of the species indicated in Clause 3.1.1. of CSA 0132.1-1975, "Wood Windows." Allowable defects shall not exceed those described in Clause 3.2.1. of the same Standard. Such frames shall be treated with preservatives in accord-ance with Clauses 5.2 and 5.3 ofCSA 0132.1-1975, "Wood Windows."

(8) Steel frames for exterior doors shall be painted with a rust inhibitive paint or otherwise treated before erection to prevent corrosion. Such frames shall incorporate a thermal break to prevent a through metal path from the interior to the exterior.

F.

GLASS

(1) Glass thickness and the size of glass for doors shall conform to Table 6B. TABLE 6B-GLASS SIZE FOR DOORS

Minimum Glass Weight Maximum Perimeter,

or Thickness in.

18 oz. 80

24 oz. 120

32 oz. 160

3116 in. 180

7/32 in. not limited

Column 1 2

i

(2) Glass side lights greater than 18 in. in width that could be mistaken for doors, glass in storm doors and glass in sliding doors within or at every entrance to a dwelling unit and in public areas shall be safety glass of the laminated or tempered type conforming to CGSB 12-GP-Ic(I973), "Glass, Safety, Tempered or Laminated, for Building Construction," or shall be of wired glass conforming to CGSB 12-GP-ll (1973), "Glass, Wired, Safety, for Building Construction."

(3) Glass in entrance doors to dwelling units and in public areas, other than the entrance doors described in (2), shall be safety glass or wired glass of the type described in (2) where the glass area exceeds 5 sq ft and extends to less than 36 in. from the bottom of the door.

(4) Mirrored glass doors may be used only at the entrance to clothes closets. Such doors shall be reinforced with hardboard, plywood or particleboard securely fastened to the back of the mirror unless the glass is safety glass of the laminated or tempered type.

(5) Except as provided in Article 7 F (3), every glass or transparent door accessible to and used by the public shall be equipped with hardware, bars or other permanent fixtures designed so that the existence and position of such door will be readily apparent. (6) Glass, other than safety glass, shall not be used for a shower or bathtub enclosure. (7) Where the January design temperature on a 2'12 per cent basis is less than

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determined in accordance with NBC Supplement No. I, "Climatic Information For Building Design in Canada 1977," exterior glass doors and side lights adjacent to exte-rior doors¥all be equipped with double glazing.

(8) Double glazing required in (7) shall be provided by either double doors or shall be fac-tory-sealed double-glazed units in a single door. A thermal break shall be incorporated in metal door frames where 2 doors are provided, or in the metal double glazing frame where a single door is provided, to reduce the risk of surface condensation on the frame.

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