A self-adhesive edge lap on Cosella-Dorken’s Delta-Vent SA barrier addresses challenges with lap adhesion issues by allowing the membrane to stick to itself. A 2-inch strip of adhesive on the top edge of the front side of Delta-Vent SA is covered with a release liner. Locking this edge with the bottom side of the next course creates a securely sealed lap that stays tight. Maintaining a vapor permeability of 50 perms, Delta-Vent SA also fully adheres to the substrate, eliminating the need for mechanical fasteners. It’s priced moderately for the market; check with your distributor. cosella-dorken.com