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

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A cementitious backer unit is installed on a shower wall. Why is a waterproof membrane still required by typical TCNA wet-area methods?

CBU panels are water-resistant tile backings, not waterproof barriers CBU panels are already waterproof, so a membrane is only decorative ANSI A118.9 classifies CBU as an A118.10 membrane Membranes are required only on dry closet walls

Correct Answer:

CBU panels are water-resistant tile backings, not waterproof barriers

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