Venting of flat roofs

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Series titleCanadian Building Digest; no. 176
Physical description5 p.
SubjectRoofing; ventilation; flat roofs; ventilated roof spaces; humidity transfer; thermal insulation; Moisture performance
AbstractMoisture traps in roof systems should be avoided. Where a double membrane system is to be provided this can be accomplished by designing a vented system. Breather vents can relieve vapour pressure and provide for drying of small quantities of moisture over a relatively long period of time. They tend to be unsuccessful in drying wet roofs unless wetting can be eliminated at the source and the venting system designed to facilitate drying. Venting can be achieved without stack vents [see CBD-99] or systems can be used that do not need vents [see CBD-150].
Publication date
PublisherDivision of Building Research. National Research Council Canada
AffiliationNRC Institute for Research in Construction; National Research Council Canada
NoteAussi disponible en français : Ventilation des toitures-terrasses
Peer reviewedNo
NRC number1661
NPARC number20327678
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Record identifierabcb13d9-2f07-48af-b6bd-021ae66a2e19
Record created2012-07-18
Record modified2016-05-09
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