Henry Air Bloc 31MR : Elastomeric Membrane

Henry Air Bloc 31MR : Elastomeric Membrane

Henry Air Bloc 31MR is a liquid applied, elastomeric membrane designed to provide a permeable air & water barrier when applied to above-grade wall assemblies. It is single-component, water-based and cures to a tough monolithic rubber-like membrane, which resists air leakage and water penetration. Henry Air Bloc 31MR combines the proven performance of Henry Air Bloc 31MR with the addition of Henry antimicrobial technology to create an integral mold resistant membrane. Questions? Contact Us.

Air-Bloc 31MR is used in construction of high performance wall assemblies requiring vapor permeability in an air & water barrier membrane. Integrated with Blueskin flashing and accessories to form a complete wall system meeting highest industry performance standards. Commonly used on variety of wall substrates and sheathing prior to installation of exterior cladding.

All surfaces must be sound, dry, clean and free of frost, oil, grease, dirt, excess mortar or other contaminants. New concrete should be cured for a minimum of 16 hours before Air-Bloc 31MR is applied. Concrete surfaces should be free of large voids and spalled areas. Joints between panels of exterior grade gypsum, plywood and rigid insulation up to ¼” wide shall be filled with a trowel application of Air-Bloc 31MR and reinforced with a strip of 2” wide glass fiber tape such as Henry #183 Yellow Glass Fabric prior to application of liquid membrane. Joints between panels of exterior grade gypsum or plywood wider than ¼” should be sealed with Blueskin membrane adhered to the primed substrate (use Blueskin Primer or Henry #545 Aquatac) and lapped a minimum of 3” on both sides of the crack. Joints wider than ¼” between panels of rigid insulation are not permitted. Mortar joints on CMU walls should be struck flush with block surface. Cracks in masonry and concrete up to ¼” wide shall be filled with a trowel application of Air-Bloc 31MR and allowed to cure overnight prior to application of the liquid membrane to the surface, or alternatively, the cracks may be sealed with a strip of Blueskin membrane applied to the primed substrate (use Blueskin Primer or Henry #545 Aquatac). Cracks wider than ¼” should be sealed with Blueskin membrane adhered to the primed substrate and lapped a minimum of 3” on both sides of the crack. Transition joints between two dissimilar materials at beams, columns, window and door frames, etc., should be sealed with strips of Blueskin membrane, lapped a minimum of 3” on both substrates. Mechanical attachment should be made to all window and door frames, or a properly designed sealant joint should be provided.

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