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Does 12cm wooden boards also need to be used for ceiling decoration? It is a flat ceiling.

Generally, the flat part of the hanging board is made of 9mm gypsum board or 5mm plywood, which can be multi-layered.

12mm boards may be used in the vertical parts of the modeling ceiling, but they will not be used in the flat parts.

If you are talking about a completely flat ceiling, then 12mm boards will not be used.

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