SR215 First results of a study of roof underlays (2009)
Product Description
This is the second of a series of reports prepared during research into the role of roof underlays for moisture management in roof spaces. The report describes the physical properties of a range of roof underlays and other building wraps, the layout and instrumentation of a test house built to test them and some of the experimental results obtained.
Roof underlays constitute the second line of defence of the roof envelope, and they are an essential element of the interstitial moisture management strategy in roof spaces. This report describes some of the experimental results obtained during a study of roof underlays aimed at investigating which of their physical properties are required to fulfill the task of managing moisture in interstices.
After a review of some of the physical properties of a range of building wraps (mainly roof underlays but also wall wraps), a description of the layout and of the instrumentation of an experimental building where most of the tests are conducted is given.
Then two phenomena that could give rise to interstitial condensation are investigated: condensation generated by night sky radiative cooling and condensation driven by solar radiation. Some preliminary experimental results about the behaviour of roof underlays are given for both mechanisms.
Product Information
Publication date | 2009 |
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Author | Luca Quaglia and Malcolm Cunningham |
System number | SR215 |