HydraFlash-TWF is made of a strong woven 12 mil high density polyethylene film coated with a low density polyethylene.  This weaving process produces a highly tear resistant film.  The white low density polyethylene coating increases UV resistance and reduces heat build up.  Laminated to the film is a 28 mil flexible rubberized asphalt adhesive backing.  Strong bonding to a variety of substrates is achieved by using a primer adhesive. HydraFlash-TWF provides a water and vapor-proof barrier over a variety of substrates.  Penetrations by fasteners into the substrate are sealed against leakage.

HydraFlash-TWF is used as a thru-wall flashing material on masonry surfaces, concrete surfaces, head and sill flashing, around windows, doors, penetrations and construction gaps.  HydraFlash-TWF is also used in conjunction with AirGuard 0727 and HydraFlash to form an air barrier assembly in exterior wall assemblies.