Henry BH200WB4559 Blueskin Weather Barrier 4"X50'"HENRY CO" BLUESKIN WATERPROOFING MEMBRANE Blueskin WB Window & Door Flashing, a product of Henry Company, the leader in commercial Building Envelope Systems, helps save energy, and increases savings and comfort by sealing out air and rain. Size: 4" x 50' Self adhering membrane consisting of an SBS rubberized asphalt compound which is integrally laminated to a blue engineered film. The membrane is specifically designed to be self adhered to a prepared