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Underlay

Torch applied roofing is a flat roof covering solution that involves three layers of modified bitumen (felt) melt-welded onto the roof surface and each other with the use of a blowtorch to create an impenetrable, waterproof seal. Torch-on roofing felt is known as one of the quickest and most reliable flat roof installations readily available in the UK. The three layers which are traditionally used in this process are a vapour control sheet, reinforced felt and a cap sheet with mineral finish. Using three layers of felt is required by building regulations for habitable areas of a home. For sheds and garages, only two layers may be needed.
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