Henry Air Bloc LF is a moisture cure single-component elastomeric liquid-applied flashing using a highly advanced Silyl-Terminated Polyether (STPE) polymer. It is designed to cure through reaction with airborne moisture to provide a heavy-duty seamless rubber- like impervious membrane with excellent weathering and water resistance.Questions? Contact us
Surface Prep: Substrates should be dry and clean of oil, dust, excess mortar and sharp protrusions, standing water and frost. Concrete surfaces must be cured a minimum of 14 days. Damp concrete is acceptable but must not be wet. Acceptable substrates are precast concrete, cast-in-place concrete, concrete block, primed steel, aluminum mill finish, anodized aluminum, galvanized metal, exterior-grade gypsum board, OSB and plywood. Strike masonry joints flush. Concrete surfaces must be smooth and without large voids, spalled areas or sharp protrusions. Where curing compounds are used, they must be clear resin based, without oil, wax.
Fill open joints, seams and cracks wider than 1/8” (3 mm) up to 1⁄2” (13 mm) with 925 BES Sealant or Air-Bloc LF prior to final application of Henry Air-Bloc LF.
Apply: Apply Air-Bloc LF to substrate in a serpentine fashion using appropriate caulking gun and then spread using a trowel, joint knife or roller to achieve a monolithic membrane over the rough opening surfaces. Regularly monitor wet mil thickness during application to assure adequate coverage. Air-Bloc LF can be applied in a single coat.
Spread uncured Air-Bloc LF to cover the inside of the rough opening and extend a minimum of 4” (100 mm) over the surface of the exterior wall. If a continuous air barrier such as Air-Bloc® or Blueskin® air barriers are used over the exterior wall, overlap Air- Bloc LF a minimum of 2” (50 mm) over adjacent membranes.