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First of all, you need to understand that in addition to its essential advantages — sound insulation, hiding defects, depending on the type of drywall, increased resistance to moisture and fire, wide possibilities in design. There are some disadvantages-you need to sacrifice about ten centimeters of height, using gypsum plasters ceilings, as well as if the neighbors are flooded, or something like that, it will be necessary to replace the completely ceiling, or its individual parts.