TECHNICAL RESEARCH
INDUSTRY EDUCATION
Illustrated Guide – R30+ Effective Vaulted and Flat Roofs in Residential Construction in British Columbia
Description This guide consolidates information on vaulted water shedding roofs and flat waterproof membrane roofs on low- and mid-rise wood-frame buildings which are capable meeting R-30 or greater effective thermal performance. The level of thermal performance is becoming part of energy performance improvements required by the BC Energy Step Code and the Vancouver Building Bylaw. The guide is intended to be an industry, utility, and government resource to meeting this thermal performance level, while not compromising other aspects of building enclosure performance, including moisture management, air leakage and durability. This guide focuses on vaulted and flat (i.e. non-attic) roof assemblies which can achieve an effective thermal resistance of R-30 (RSI-5.3) or better while meeting the other performance requirements for roof assemblies. These insulated roof assemblies help to reduce the transmission of heat energy through the building enclosure. This reduces the heating and cooling loads of the building, and the overall building energy consumption. Impact This illustrated guide will be a reliable industry resource to educate designers and builders on the pros and cons of different design strategies for roof assemblies which achieve an effective R-30 value or higher.
Guide available online at www.bchousing.org Order online at www.crownpub.bc.ca
Status:
Partners: Roofing Contractors
Association of BC, City of Vancouver, City of New Westminster, City of North Vancouver, Canadian Wood Council, Architectural Institute of British Columbia, Canadian Home Builders’ Association of BC
Audience: Builders, architects,
engineers, and the residential construction industry
60 HOUSING RESEARCH & EDUCATION PROJECT HIGHLIGHTS | JULY 2021
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