Framework for investigating building envelope defects / by Paul Fazio, Krishnan Gowri, and Raymond Blanchette, SIRICON. : NH17-249/1992E-PDF

"In order to analyze the envelope problems, Canada Mortgage and Housing Corporation has developed a "Building Problem Survey" (CMHC-BPS) database system. The objective of CMHC-BPS is to document building construction problems and descriptions, and to provide a search technique to establish the relationship between current construction practices and problem occurrences. The present study utilizes the CMHC-BPS system to analyze envelope problems reported in fifty Quebec residential buildings. Data on these buildings was collected from the Association Provinciale des Constructeurs d'Habitations du Quebec (APCHQ) warranty files consisting of inspection reports, conciliation reports, building registration forms and other relevant documents. Analysis of this data shows that moisture and cracking are the most frequent amongst the eight types of problems reported. A large number of these problems are attributed to improper or lack of specifications, poor choice of materials, poor workmanship, and a lack of understanding of certain building science principles. Builders need to be better informed of the role of flashings, importance of air barriers and its construction details, and also the shrinkage properties of wood. During data collection and analysis, it is found that the CMHC-BPS system in its present form is best suited only to document high rise masonry building details and problems."--Executive summary, page 1.

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