Gypsum board butt joint: the gypsum board butt joint should be tight, the joint need to add cross brace keel, and the gypsum board should be installed under no stress state.

The primary and secondary keels are straight: the primary and secondary keels are required to be straight, and the arching height is not less than 1/200 of the short span of the room; When large-scale suspended ceiling is planted, one large transverse keel shall be welded on the main keel every 12M.

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