Finish TradesCâu 225 / 700
A tile setter spreads thinset mortar but leaves it too long before placing tile, and a skin forms on the ridges. What is the MAIN risk of setting tile into skinned-over thinset?
a.The tile will set faster and stronger
b.The grout joints will be wider
c.Poor bond because the skinned surface no longer transfers adhesive to the tile
d.The mortar color will change but bond is unaffected
Giải thích
Once thinset skins over (passes its open time), it can no longer wet out and grab the back of the tile, so bond strength drops and tiles can debond. The setter should remove the skinned mortar and re-spread fresh. It does not set stronger, does not widen joints, and the skin is a real bond problem, not just color.
Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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Đội Ngũ Biên Tập PrepPass · Đối chiếu với California CSLB General Building (B) Trade Examination · Quy trình kiểm tra