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1. When using Polyfoam Sarking Board System, How much of the board sits on top of the rafter?

Always 55mm. Polyfoam Sarking Board System consists of a 75mm T-Shaped `Top Hat` overlay board and Polyfoam Raftersqueeze flexible infill board. Raftersqueeze infill board is available in thicknesses of 75mm, 65mm and 50mm.

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