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Digest 312 Flat roof design: the technical options
Publication Year
1986
Document Status
Current
Abstract
The term flat roof is used in UK codes and standards to denote a roof having a slope of up to 10° (about 1 in 6) to provide drainage. The term 'low-pitched' is also used to denote the upper end of this range. Flat roofs are characterised by having a continuous waterproof layer. Experience has shown that high maintenance costs can occur with flat roofs. Many of the problems investigated by BRE in the UK could have been avoided at the design and construction stages if designers and constructors had appreciated fully the limitations of the various design options, and how appropriate each was to the particular building. It is possible to design flat or low-pitched roofs that will give satisfactory service and acceptable maintenance costs provided that sound design is supported by correct selection of materials and components, and followed by good standards of workmanship during construction and planned inspection and maintenance in service.
Document History
Replaces - BRE Digest 221.
Publisher Information
BRE
BRE is a building science centre that generates new knowledge through research. This is used to create products, tools and standards that drive positive change across the built environment. BRE helps its government and private sector clients meet the significant environmental, social and economic challenges they face in delivering homes, buildings and communities. BRE is owned by the BRE Trust, a registered charity. The Trust uses the profits made by the BRE companies to fund research and education that advances knowledge of the built environment.
IHS BRE Press
The Capitol Building
Bracknell
BRE
UK
