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| The recommended finishing for ceiling with insulating building boards is following: |
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| The exposed side of the board is truly and plane. |
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| Boards should be without any local bulges or sags. |
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| The joints are truly parallel to the walls. |
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| The width of joints is uniform. |
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| Uniformity in the colors of the sheets is needed. |
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| For covered joints beadings of side, pattern and other material are fixed with screws. |
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| The ceiling is treated with paint or distemper. |
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