Finish TradesCâu 422 / 700
In a tub or shower area that will receive tile, which type of gypsum panel product is UNSUITABLE as the tile backing directly exposed to wet conditions?
a.Standard (regular) gypsum wallboard
b.Cement board
c.Glass-mat water-resistant backer panel
d.Fiber-cement backer board
Giải thích
Standard gypsum wallboard is not acceptable as a tile backer in direct wet areas because its paper and core deteriorate with moisture. Cement board, glass-mat water-resistant backer, and fiber-cement backer are all manufactured to tolerate the wet exposure behind tub and shower tile.
Trích dẫn luật: 2025 CA Residential Code §R702.4Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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