Moisture Problems in Built-up Roofs

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TypeTechnical Report
Series titleTechnical Paper (National Research Council Canada. Division of Building Research); no. DBR-TP-390
Physical description35 p.
SubjectRoofing; built up roofing; moisture content; water absorption; deterioration; roofs; Moisture performance; Couvertures; multicouche; degre hygrometrique; absorption d'eau; deterioration; toiture
AbstractThis paper discusses some of the harmful effects of water on building materials, particularly those used for roofing systems. These effects include dimensional changes, frost action, corrosion, leaching and efflorescence, biological deterioration, and blistering. It then describes sources of water such as initial moisture content, construction moisture, water vapour inside buildings, and precipitation as a result of weather. The modes of moisture migration, including water vapour diffusion, air leakage, and rain leakage are examined. Finally the paper states some principles of design that must be followed to control water from all sources and so limit or avoid moisture problems.
Publication date
PublisherNational Research Council Canada
AffiliationNational Research Council Canada
Peer reviewedNo
NRC numberNRCC 13283
NPARC number20375260
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Record identifierccf5a617-d08e-41c1-8d65-506c1fe5a627
Record created2012-07-23
Record modified2017-06-29
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