Can tiles be installed directly over Exposure 1 rated OSB panels?
Direct application of tile mortars over oriented strand board (OSB) panels is not recommended; first, an uncoupling membrane such as Mapeguard UM is needed as a substrate for proper adhesion of the mortar.
For more information, see the technical document “Surface Preparation Requirements.”
Mapeguard UM is a premium-performance, lightweight, waterproofing and vapor-pressure-equalizing underlayment membrane that provides crack suppression for use under ceramic tile and stone…
Mapeguard UM is a premium-performance, lightweight, waterproofing and…
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