Snow loads on multi-level flat roofs in Canada

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ConferenceProceedings of the 55th Western Snow Conference: 1987-04, Vancouver, BC., Canada
Pages133141; # of pages: 9
SubjectRoofing; flat roofs; snow loads; limit state method; building codes; Snow and Ice loads; Couvertures; toiture terrasse; charge de neige; méthode de l'état limité; code du bâtiment
AbstractBetween 1967 and 1982, depths and specific gravities of snow were recorded on over 40 multi-level flat-roofed buildings between Halifax and Edmonton. The average specific gravity of snow in the drifts where the roofs change elevation was about 0.3, some 25% higher than the design value. The paper presents average and maximum roof-to-ground load ratios for upper roofs and lower roofs away from the drifts. These compare favourably with those recommended in the 1985 National Building Code of Canada (NBC). Data on maximum snow loads in the drifts and on the geometry of the drifts is presented and compared to provisions in the NBC. The statistical variability of snow loads and specific gravities is discussed as it is required to establish load factors used for Limit States Design in the NBC.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number28486
NPARC number20386330
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Record identifier4c6fbc51-7d54-4ee1-a580-6010d0f294eb
Record created2012-07-25
Record modified2016-05-09
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