'THE USES AND PERFORMANCE
REQUIREMENTS OF STEEP-SLOPE ROOF UNDERLAYS IN NORTH AMERICA
AND THE UNITED KINGDOM'
A Paper presented jointly by Robert J Booth
and Keith Roberts at the North American Conference on Roofing
Technology, Toronto, September 1999.
condensation, ice damming, sarking, tiles, underlay, ventilation,
The use and performance requirements for
underlays used in steep-slope roof systems differ depending
on the type of roof system, materials used and climate.
The requirements of underlays in the most
common roof systems in North America and the United Kingdom
are reviewed in separate sections of this paper. Design
and installation guidance for underlays is available from
contractor associations and manufacturers.
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Roberts of robertsconsulting.co.uk' is named as the source.
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