Higher resistance to construction site conditions and humidity compared to conventional vapor retarders.
Vapor retarder membrane made from PP, protected on both sides by a polypropylene cover.
Very watertight, resists 8.2’ ft of water column.
Low vapor permeability (1.43 perms) – Sd-value 2.30m
Caution: DA should be primarily used in combination with vapor open materials and membranes. Do not use in wall/roof assemblies that contain vapor closed materials that restrict the drying potential (flatroofs, greenroofs, vinyl wall paper).
DA can be used for many demanding purposes. For instance:
In a heating climate, wrap the exterior of the walls with DA, before applying the exterior fibrous insulation, EPS, XPS or Poly-iso. Materials should be able to dry both sides of the DA.
In a cooling climate, use DA as an airtight WRB on the exterior that works as a vapor retarder. Keeping the humid air outside.
Can function as a temporary roof, when pitch is 10 degrees or more.
Suitable to be walked over, fabric provides traction.
Roll width: 59″ (1.5m)
Roll length: 164′ (50m)
Roll area: 807 SF (75m2)
DA Product Specification (PDF)
3 part spec – interior air- and vapor control layer (PDF)