Why use sarking boards?
Sarking boards are softwood boards, typically 150mm wide with a maximum of 5mm of space between each board, which are attached directly to the rafters. This gives the roof extra strength because having the sarking boards attached to the rafters creates a greater area to fix to and, therefore, strengthens the structure. The breather membrane can be put directly onto the sarking boards and tiles also fixed to the sarking boards but above the breather membrane. This is beneficial to buildings in areas with high winds, and also allows extra space for a thicker insulation board: The use of sarking boards is very common in Scotland.
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