00000nam 2200000zi 4500 9.906283 CaOODSP 20221107181057 m o d f cr |n||||||||| 211222s1993 onc o f000 0 eng d CaOODSP eng rda CaOODSP eng eng fre n-cn--- NH17-301/1993E-PDF Report - a commissionable air barrier system for the building envelope. Ottawa, Ontario : Canada Mortgage and Housing Corporation, Housing Innovation Division, 1993. 1 online resource (ii, 35 pages) text txt rdacontent computer c rdamedia online resource cr rdacarrier Digitized edition from print [produced by Canada Mortgage and Housing Corporation]. "Presented to: Mr. Pierre Michel Busque, Project Officer." "July 14, 1993." "Report no. 33127.02." "Since the mid 70's, the construction industry has made significant advances in energy conservation and improved indoor conditions. These improvements, however, are shadowed by an increase in building envelope problems to include water penetration, condensation on and in roofs and exterior walls and cladding damages in many of our newer buildings. These problems have been attributed to uncontrolled air leakage. A study of the causes of air leakage through the envelope has revealed that it is not just poor workmanship but a much broader problem, involving inadequate design, the lack of measurable performance indicators, ambiguous regulatory requirements and a general misunderstanding of air and vapour barriers"--Introductory summary. Includes introduction in English and French. Buildings Canada Airtightness. Constructions Canada Étanchéité à l'air. Canada Mortgage and Housing Corporation. Housing Innovation Division, issuing body. PDF 998 KB https://publications.gc.ca/collections/collection_2021/schl-cmhc/NH17-301-1993-eng.pdf