Profile familes can broadly be segregated as pierce fastened (corrugate, trapezoidal), and secret fix (tray and trough). Within theses broad categories there are subsets.


Symmetrical corrugate or trapezoidal profiles have the advantage of being more easily curved around a radius. Because the ribs are necessarily close together, they have the disadvantage of roof traffic loads having to be spread over two crests, and they have a lower run-off capacity.

Revision Category: 
3 - Substantial change to recommendation
Revision Detail: 

This clause has been revised as part of the overall revision of Structure. Some copy has been moved to Section Properties, and new content added to this clause. The profiles in the illustration Fastener Fixed Profiles were also reordered and the illustration Secret Fixed Profiles has been moved to Trough Section.

Draft Clause: