Spot bond
- Thread starter jrob
- Start date
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J
js.roofing
The felt with holes in (3g) is a vapour control layer which is usually laid loose, or part tacked. The next layer either torch on or hot bitumen applied 2mm underlayer then forms the spot bond onto the deck- to allow for thermal movement.
J
js.roofing
Could have sworn i said venting layer!!
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