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Before you decide to install the ceilings from drywall two -levels, you need to decide how many centimeters can be sacrificed for this case. Spotlights, which are usually built into such ceilings, have a height of at least 9 cm. This means that at least 10 cm of the height of the room will have to be allocated only for lamps. In addition, to two -level drywall ceilings, they often hide different engineering communications (electric cables, sewage pipes, ventilation boxes). And this is still a minus in the height of the room.