SOPRASEAL STICK AVB AT is a self-adhesive acrylic-based air and vapour barrier membrane, composed of a tri-laminated woven polyethylene surface. It is also used as a through wall flashing membrane as well as a waterproofing membrane at openings and transitions. SOPRASEAL STICK AVB AT can also be use in conjunction with SOPRASEAL STICK 1100 T as a wall flashing membrane.