Roll 25 Alpa
ROLL 25 ALPA is a glass-fibre reinforced bitumen air and vapour control layer with ALPA binder. It has a thermofusible film on the under surface. An air and water vapour control layer (AVCL) low permeability membrane used as part of a system to control the movement of air, watervapour and heat leakage fromwithin the building. Can also be used as base or underlayer as part of a multi-layer waterproofing system.