Graphical Construction Glossary >> Roofs and roofing. >> Roof Coverings >> Roofing Lap
Above is a sketch showing the end lap on slates. Basic to any material like this is that we lay the bottom row first and overlap each row after by a certain amount.
The concept of lapping one part of roof sheeting is the most basic principal of roof cladding or sheeting. Very few roofs do not use lapping in one way or another.
The amount of overlap varies from material to material and the amount varies also depending on the pitch of the roof.
Material manufacturers provide data on how much overlap to use in certain circumstances. If in doubt use more lap than recommended.
Here is a photo of an old tired roof, but thanks to the use of overlap in it's various parts it is still watertight after 60 years.
Roofing lap in it's many forms is essential. Do not be tempted into the easy fix with silicone sealants. Get the lap right and they are not needed.
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