2024-25_NTCA_Reference_Manual_dig_dwnld

Backer Boards

Problem

Prevention

Cure

Organic adhesive used to install tile over backer board installed in a wet area. Note: Cement backer board will wick moisture when used in wet areas and will remain wet. Organic adhesives are not recommended in areas con tinually exposed to moisture. Using a setting material that is not rec ommended for the specific type of back er board and/or tile. Not wiping down the surface to remove dust and/or add moisture to the backer board when required.

White grout and/or tile yellowing.

Use a dry set or latex Portland cement mortar when installing the tile.

Tile bond failure.

Consult the backer board manufacturer for the specific adhesive recommendation.

Coverage does not meet requirements of ANSI A108.5

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National Gypsum Company is the exclusive service provider for products manufactured by PermaBASE Building Products, LLC. NG 9777-3 11/22 © 2022 National Gypsum Services Company

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NTCA Reference Manual | 2024 / 2025

Chapter 3 | Backerboards and Underlayments