Use TW-Thru Wall Flashing membrane with concrete, masonry, gypsum sheathing, foam insulation, or wood wall construction. The flashing is a flexible 40-mil. sheet membrane consisting of self-adhering rubberized asphalt, a removable treated release film, and a high-density 8-mil. polymer film as the top surface. It is available in 12-, 18-, 24-, and 36-in. widths. Tamko Building Products Inc. 800-641-4691.