SK VAP is a self adhesive air and vapour control layer (AVCL) low permeability membrane used as part of a system to control the movement of air, water vapour from within the building. Can also be used as a base or underlayer in a multilayer waterproofing system. SK VAP is accredited for use in Axter single ply, reinforced bitumen membrane (RBM) and cold applied liquid waterproofing systems.