Vap Alu ADH is an air and vapour control layer (AVCL) with sand on the surface and a self adhesive undersurface.
An AVCL low permeability membrane used as part of a system to control the movement of air, water vapour and heat leakage from within the building. Can also be used as base or underlayer in a multi-layer waterproofing system.
It's about time. We need to #lookup.