PROVA® Inside Corners are made of durable polypropylene and are fully waterproof and vapor tight. Made of PROVA-MAT® Waterproofing Membrane, these precut, pre-formed corners eliminate seams in waterproofing and easily seal shower corners. The waterproof corners come in packs of two and are installed using Premium Modified Thinset and a 1/4 in. x 3/16 in. V-Notch Trowel. Do not use premixed mortar for installation of PROVA products.
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