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Question:

Gypsum board ceiling installation corner must be seven-shaped

Gypsum board ceiling installation corner must be seven-shaped

Answer:

This is not necessarily, as long as the long-term construction found in such a way, can be formed with the keel joints dislocation, in order to reduce the probability of cracks on the board.
You should say is mineral wool gypsum board bar (specifications 600 × 600 or 600 × 1200), the corner must be used piece "L" type, or take the sub-bone and edge aluminum. Norms also have this requirement.

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