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Canadian Builder, 17, 2, pp. 35-36, 1967-03-01
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The residential standards: comments on the new revisions
Hansen, A. T.
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l : - - - , - - |NATIONAL RESEARCH COUNCIL
CANADA
DIVISION OF BUILDING RESE,ARCH
THE
RESIDENTIAT
STANDARDS:
COTI,IMENTS
ON THE
NEW
REVISIONS
by
A . T . H A N S E N
REPRINTED FROM
CANADIAN BUILDER, VOL. XVII, NO.
FEBRUARY 1967, P. 35
TECHNICAL PAPER NO. 241
OF THE
DIVISION OF BUILDING RESEARCH
OTTAWA. MARCH 1967
4|ililzuruililil
I\RC 9480
73056
The Residential
Standards:
Gomments
on the new revisions
By A. T. HANSEN
Reoearrch Officer, Housing Secti'on, Divisio,n of Building Research,
Notionql Resoarch C,ouncil It has been the policy of the Asso-ciate Committee on the National Building Code to keep the Residential Standards up to date by annual revi-sions. After a review of comments submitted by the users of these Stand-ards during L966, a number of revi-sions have been agreed upon and these have been inoorporated in the Decem-ber, 1,966 revisio,n series.
About thirty-eight items are covered of which about half are of an edi-torial nature or are updatings to ref-erence standards or specifications. Of the remainder, there are a number which are of particular significance to those using the Standards.
This paper has been prepared as a service to those using the Standards to acquaint them with the more sig-nificant changes. In the following list of changes, the clause and page number in the Residential Standards affected by the change are shown in brackets. (These revisions will be-come effective for all CMHC loans approved on or after I April 1967 but NHA borrowers may apply the revi-sions immediately at their discretion.) 1. Fire resistance between al,artment
units (4 F (7), p. 2l)
In apartment buildings of three storeys or less, the fire separation be-tween dwelling units has been reduced from t hour to 7+ of an hour.
2. Fire resistance between houses and garages (4 H, p. 22)
Fire separations between attached or built-in garages and one- and two-family houses are no longer required, Insulation in such separations, how-ever, must be protected from mechan-ical damage by plywood, particle board, gypsum board, hardboard or similar protection. In addition, doors located in such separation must be the equivalent of. l3/c in. solid core wood, weather-stripped and fitted with auto-matic closures to prevent gas or ex-haust fumes from entering the house. Since the wall or ceiling between a garage and a one- or two-family house
is no longer to be considered as a fire separation, fire dampers activated by fusible links are no longer required in ducts passing through such assemblies. Automatic closures to prevent garage vapors from entering the heating sys-tem are still required, however. 3. Masonry Walls (14 O (l), p. 42)
Where masonry walls incorporate an insulation such as foamed polysty-rene which limits the passage of water vapour, and is applied directly to the masonry, with a waterproof adhesive or mortar the walls do not have to have additional parging on the inside, nor does a building paper have to be incorporated in the construction. 4. Window Sills (14 O, p. a2)
Where window sills are applied without flashing, the sills must be made with a drip at least 1 in. away from the wall face.
5. Roo,f Trusses (17 F, p. a9)
A new clause has been added to prevent notching, drilling or other damage to roof truss members unless such features are allowed for in the truss design.
6. SuMlooring (17 O, p. 54)
Requirements have been added de-scribing the use of particle board subflooring. Such subflooring must conform to CGSB specification 11-GP-1, Type D particle board. It must
be at least % in. thick on supports up to 16 in. o.c.,3/+ in. thick on supports up to 20 in. o.c., and 1 in. thick on supports tp to 24 in. o.c. Where 3/+-in.-thick matched strip flooring is laid at right angles to the joists, however, s/e-in.-thick particle board may be used on supports up to 24 in. o.c. Where particle board subfloors are used, re-silient-type finishes must be applied over a separate underlay so that movement in the subfloor joints caus-ed by dimensional changes of the sub-floor will not be revealed in the re-silient flooring.
7. Roof Sheathing (I7 P, p. 54) Requirements have been added de-scribing the application of particle board roof sheathing. Such particle board must also conform to CGSB specification 11-GP-1, Type D. It must be at least 3/e in. thick on sup-ports up to 16 in. o.c. and 7/16 in. tbick on supports up to 24 in. o.c. The edges are to be supported either by blocking or metal H clips at these thicknesses. Where the roof surface is to be used as a promenade or other walking surface, the decking must conform to the thickness requirements for subfloors.
8. Metal SidlnEs (22 B(3), p. 67) Ventilation behind metal sidings is no longer required. As such sidings are usually installed in fairly narrow widths, it is thought that there is suf-ficient air infiltration through the nu-merous joints to prevent serious mois-ture build-up behind the siding. 9. Interior Finishes (24 M, (New
clause) p. 77)
New requirements have been add-ed for the application of particle board interior finishes. In general, the requirements for particle board are the same as for hard board. It must be at least Y+ Ln. thick on sup-po,rts spaced 16 in. o.c. and 3/e in. thick on suppoirts spaced 24 in. o.c. 10. Doors in Fire Separations (27 F,
p. 85)
In apartments of three storeys or Iess, a l3/c-in. solid core wood door may be used in any fire separation which is required to be at leasrt 3/t hour. In effect, this will permit the use of such doors as exit doors separating M R . H A N S E N
public hallways from exit stairways in two- and three-storey apartment build-ings.
ll. Garage Doors (27 H(2), p. 86) The height of the clear opening with the garage door in the open posi-tion has been reduced from 6 ft 6 in. t o 6 f t 4 i n .
12. Hot Water Tanks (30 E(9), (10),
(r2), p. e2, 93)
These clauses have been revised to
permit combinations of tank capacity and heating capacity other than those tabulated in Residential Standards. This will allow greater flexibility in the design of domestic hot water sys-tems. In all cases, however, it must be shown that combinations other than those tabulated in the Standards will provide an adequate supply of hot water.
Comments on the Residential
Stand-ards will be welcomed by the Asso-ciate Committee on the National Building Code for consideration in fu-ture revisions. These comments should be submitted no later than
1 September 1967. All comments should be submitted in writing to: The Secretary, Associate Committee on the National Building Code, National Research Council, Ottawa 7, Ontario, Canada.
