FortiFlex Butyl is constructed from a technically advanced hybrid butyl compound and a high-performance crepe film that features exceptional stretch and durability. FortiFlex Butyl can be stretched around tight arcs, including arched windows, irregular penetrations and sill pans. It adheres tenaciously to most common construction materials, including plywood, OSB, aluminum, rigid vinyl, gypsum board, primed steel, concrete and concrete block.
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