Chimneys obstruct rainwater flowing off a roof and need to be well detailed and flashed to prevent problems.
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Dormer roof junctions with profiled metal roofing always present a tricky area of flashing and their detailing is often conveniently overlooked by designers.
It can be difficult to determine the critical dimensions for roof flashings in E2/AS1. We step through Table 7 to help clarify confusion when working out the minimum sizes of flashings.
A very tricky roof-to-wall junction detail occurs at the top and bottom junctions of a monopitch dormer roof. Here is one option that, if built correctly, will be weathertight and look good.
A flashing is a folded length of metal that provides a weathertight cover at junctions in and between walls and roofs. Getting them right is a good start towards constructing a weathertight building.
BRANZ is sometimes asked how to detail roof-to-wall junctions. The detailing can be tricky, but following the Acceptable Solution and these step-by-step illustrations will help.
Flashings play a vital role in keeping water out of buildings. Follow this useful guide to check the requirements for roof flashings in Acceptable Solution A2/AS1.
Small pipe penetrations in roofs are typically flashed using proprietary EPDM boot flashings.