'WORKING TOWARDS GETTING
THE ROOF RIGHT FIRST TIME'
A Paper presented at the Ninth Congress of the
International Waterproofing Association,
Amsterdam, April 1995.
roof design, roof performance, roof design responsibility.
This Paper is a piece of practitioner
research offering constructive feedback from investigations
on a wide variety of roof types. Two common mistakes are
the inadequacy of the roof design, and the widespread
use of constructions that could be described as 'infirm'
with narrow margins for error.
Understanding the real in-service behaviour
of a roof system is complex and follows from an appreciation
of the inter-relationships between four
disciplines: namely waterproofing;
structure; heat and vapour control; and materials science.
For special situations, such as roofs above humid interiors
or in exposed locations, a 'whole system' approach is
even more necessary, demanding that designers have a good
working knowledge of all four disciplines. Reliable and
concise design guides are sought.
Responsibility for the various elements
of the design
work has become divided and confused, especially
in the highly competitive 'design and build' form of contracts
popular in the United Kingdom.
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