DuPont Straight Flash VF 6" x 125' - Tyvek System Keeps water out around non-flanged and brick mold windows and doors in brick facades or molding Dual-sided butyl, self-adhered window and door flashing helps keep wind-driven rain from entering around non-flanged and brick mold windows and doors in brick facades. Specially designed release papers for easier installation of the flashing Helps prevent water damage to windows, doors. In addition, it can keep water out of wall systems and away from insulation, to improve both durability and energy efficiency.