NV C-20 Tiling Practice Questions - Nevada C-20 Tiling Contractor Examination Exam

Why is paper-faced gypsum board the wrong backing for a tiled tub surround?

Paper-faced gypsum is too hard for thin-set to bond Paper-faced gypsum is waterproof, so a membrane cannot stick ANSI A136.1 requires paper-faced gypsum behind every wet wall Paper-faced gypsum deteriorates when it stays wet and is not an accepted wet-area tile backing

Correct Answer:

Paper-faced gypsum deteriorates when it stays wet and is not an accepted wet-area tile backing

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