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Canadian Builder, 16, 3, pp. 48-49, 1966-03
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Revisions to NBC residential standards
Hansen, A. T.
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Ser
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no. 219
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BI,DG
NATIONAL RESEARCH COUNCIL
CANADA
CONSEIL NATIONAL DE RECHERCHES
k"9...-U
A N A L Y Z g D
REPRINTED
CANADIAN BUILDER.
MARCH 1966
S u r L i T I L S E A R C H. I- LiRARY
.
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2? s6
ilAtldtrAL REsEARcH couldJ
TECHNICAL PAPER NO. 219
OF THE
DIVISION OF BUILDING RESEARCH
NRC 8976
REVISIONS
TO NBC
RESIDENTIAI
STANDARDS
by
A. T. HANSEN
FROM
VOL. XVI, NO. 3
P. 48-49
Price l0 cents
OTTAWA. MARCH 1966
CHECK
THE SIGNIFICANT
CHANGES
Revisions
to NBC residential
standards
By A. T. HANSEN Housing Section,
Division of Building Research, N.R.C. The 1965 Residential Standards (Supplement No. 5 to the National Building Code) has now been in use almost a year, having replaced the former Housing Standards and Apart-ment Standards.
It is the policy of the Associate Committee on the National Building Code to keep the Residential Stand-ards up-to-date and as usable a docu-ment as possible. Comdocu-ments by the users of the Standards are, therefore, reviewed periodically and revisions is-sued annually where changes are war-ranted.
The 1966 revisions to Residential Standards cover about 70 items. About 40 of these are either of an editorial nature or an updating of reference specifications. In addition, a new set of facsimile grade marks for lumber have been included in the revisions.
(These revisions will become effec-tive for all CMHC loans approved on or after April 1, 1966. However, at their discretion, NHA borrowers may apply the revisions immediately.)
This paper was prepared as a serv-ice to those using the Standards to acquaint them with the more signifi-cant changes. In the following list of changes the clause and the page num-ber of the Residential Standards af-fected by the change are shown in brackets.
LAUNDRY TUBS (2L(4), p.15) Laundry tubs need not be provided where a laundry area of at least 50 sq. ft. is provided. This is a return to the former requirements which were inadvertently changed in the prepara-tion of Residential Standards.
DEAD END CORRIDORS (38(2), p.l7)
Dead end corridors in public hall-ways are permitted provided they are
at least as wide as the distance between the exit door and the dead end. The length of dead end corridors must not exceed 20 ft., however, and there must not be more than three dwelling unit entrance doors opening onto it. Formerly only one dwelling unit entrance door was permitted off such dead ends and the width was not required to be equal to the length of the dead end.
FIRE RESISTANCE REQUIRE. MENTS (fable 4A, p.20)
Wood frame exterior walls are now permitted for three-storey apartment buildings provided they have a one-hour fire resistance (fire resistances of wood frame walls are listed on p. ll2 of the Standards). Requirements for minimum beam widths for balconies and mezzatines have been relaxed where heavy timber construction is permitted.
FIRE RESISTANCE OF EXITS (4F(e), (10), p.21)
Combustible construction with 3/t hour fire resistance is now permitted in three-storey apartment buildings between exits and the remainder of the building. This was formerly lim-ited to two-storey buildings.
LATINDRY CHUTES (4Q, p.25) The requirements for laundry chutes now apply only to apartment buildings and not to houses.
REFUSE CHUTES (4R, p.25) Equipment for washing refuse chutes must now be provided. In addi-tion, automatic sprinklers must be in-stalled at the top of the chute, at alternate floor levels and in the bin or room in which the refuse discharges. PLYWOOD ROOF SHEATHING (table ll&, p.54)
This Table has been extended to
include plywood thicknesses on sup-ports 32 in. to 48 in. apart where the plywood edges are supported. Ply-wood lz in. thick is permitted on sup-ports up to 32 in., % in. up to 36 in., 7+ in. up to 40 in., and 7/s in. up to 48 in.
WOOD BEAMS (l8D(1), p.56) Glue used in beams that extend to the exterior does not have to be waterproof (but has to be water resistant) if the exposed portion is adequately protected against wetting.
INSULATION (Table 204, p.59) The notes to this Table have been reworded to clarify that the maximum "U" values shown apply only to the constructions described in the Stand-ars (i.e., conventional wood frame construction, plank frame walls, post and beam construction, and masonry construction). The "U" values for other constructions are to be evalu-ated separately by the authority hav-ing jurisdiction.
LUMBER SIDING (22G(1), p.68) Requirements for minimum lumber grades for siding have b,cen dropped and replaced by a general perform-ance clause which requires that siding must be sound, free of knot holes, loose knots, through checks and splits.
NAILING OF PLYWOOD SIDING (22J(3), p.7O)
Nails for 7+ in. plywood siding must be at least llz in. long rather than lV+ in.
PLYWOOD INTERIOR FINISH QaIG), p.77)
Plywood used for interior wall or ceiling finish no longer must conform to CSA Specifications.
WOOD SLEEPERS SUPPORTING FINISH FLOORING (25A(a), p.78)
When sleepers support finish floor-ing over a concrete slab the sleepers can now be nominal 1 in. by 2 in. rather than 2 in. by 2 in.
UNDERLAY BENEATH TILE (2s8, p.78)
Underlay beneath resilient or ce-ramic floors applied with an adhesive must have all holes or open defects patched in such a manner that the de-fects will not be revealed in the finish surface.
GLASS THICKNESS (Table 268, p.82)
The use of 7/32 in. glass in panes up to 50 sq. ft. is now permitted in areas with high wind velocities. Pre-viously it was restricted to panes hav-ing not more than 140 united inches in these areas.
DOORS (278(2), p.83)
Interior doors no longer have to be provided for vestibules and lobbies in buildings containing more than one dwelling unit.
EXTERIOR STEPS (28G(1), p.88) Only one hand rail is now required on the open sides of exterior steps with more than three risers.
STAIR STRINGERS (28H(5), p.89) Stair stringers supported along their length may now be I l/16 in. thick rather than lYe in.
HOSE BIBS (30C(6), p.91)
Hose bibs do not have to be pro-vided in the laundry area where the laundry tub tap does not have a threaded connection for a hose.
HOT WATER RECOVERY CA. PACITY (30E (12), p.93)
Hot water recovery rates listed in Table 30D for multiple dwellings may be reduced where it can be shown that adequate hot water supplies can be achieved through greater storage capacity than required in the Table.
HEATING SYSTEM DESIGN (32A(6), p.96)
This section has been reworded to indicate the particular design manual that^ may be used as a guide for the type of heating system used (i.e., oil, gas, electrical).
TIEATING SUPPLY DUCTS (328, p.97,98)
Rectangular panels of ducts or plenums wider than 12 in. must be stiffened (i.e., creased). Undue crimp-ing of circular ducts at joints is not permitted. Joints in rectangular ducts must be made with "S" and drive cleats or other equivalent mechanical connections. Main and branch ducts must be supported at suitable inter-vals to prevent sagging. These requirements in effect define current good practice and to that extent do not represent an upgrading of exist-ing requirements.
WALKWAY STEPS (35C(6), p.105) Only one hand rail is now required for steps in walkways where there are more than three risers.
WINDOWS (Table 264, p.8l) Windows are no longer required in kitchens in houses when electric light-ing is provided. This means that re-quirements for houses and apartments are now the same in this regard.
GRADING (36A(5), p.106)
The requirement that the grade within 10 ft. of thc house be at a slope of between 3 in. in l0 ft. and 7 in. in 10 ft. has been deleted.
LAWN SEED (36D(2), p.ro7) Seed used for lawns must be Can-ada No. I mixture.
FIRE AND SOUND RESISTANT WALLS (Item 18, p.l I l)
Staggered stud walls with mineral wool insulation and s/e in. fire retard-ant gypsum wallboard are listed as providing a I hr. fire resistance and as providing acceptable sound insula-t i o n .
PLYWOOD NAILING (Table 1C, p.145)
Annular ring nails of 13la in. length are now permitted in lieu of 2 in. common nails for fastening plywood.
STAPLES (Table 2C, p.147)
This Table has been extended to cover stapling of lumber and plywood sub-flooring. Staples are required to be 16 gauge, 2 in. long with 7a in. crown.
NEW STANDARDS AND SPECIFI. CATIONS
A few new Standards and Specifica-tions are included which either replace U. S. Standards or Standards that have become obsolete. These new Standards include:
CSA 482.1-1965 - Burned Clay Brick
C S A 4 1 6 5 . 4 - 1 9 6 5 - C o n c r e t e Brick Masonry Units
CSA 0132.1-1965 - Wood Win-dows
Comments upon the Residential Standards will be cordially welcomed by the Associate Committee, together with notification of omissions and suggestions for its improvement. It will be helpful if these could be sub-mitted no later than I September t 9 6 6 .
All comments should be submitted in writing to: The Secretary, Associ-ate Committee on the National Build-ing Code, National Research Council, Ottawa, Canada.
