The Best Ways to Soundproof a Ceiling
Soundproofing any surface requires absorbing or repelling sound waves. The options for soundproofing range from adding used carpet to purchasing expensive custom materials. The best options will reduce the space where sound can travel as well as absorb or reduce the strength of the sound waves.
Soundproofing the Floor Above
The greatest noise seeping through the ceiling comes from the floor above. Soundproofing the floor above should be the first step in noise reduction. Adding thick rubber mats underneath carpeting is an adequate and simple solution, but custom soundproofing material such as mass loaded vinyl (MLV) works best. MLV has the texture and appearance of thick carpet, and can also be used on the ceiling. Either way, MLV should be nailed to the support beams with all seams taped to avoid the passage of sound.
The Space Between Ceiling and Floor
Resilient channels are the best solution to soundproofing the space between the floor and ceiling. Much of the sound from the floor above will come from footstep sound vibrations. Resilient channels minimize the physical contact between the ceiling and floor above, forcing sound waves to work harder to escape. Built of trough-shaped sheet metal, resilient channels attach at the floor joists and also function as support to the ceiling itself. Soundproofing foam, insulation and other insulated material reduces some noise, but used alone will not completely soundproof a room.
Ceiling Materials
Sound travels fast through air and will find any crack or open seam in the ceiling to slip through. Even if your basement has a finished ceiling it may not be enough to stop sound. Remove all ceiling fans and overhead lights as both can be noise conductors. Attach painted drywall, taped at all seams, beneath the resilient channels for the best effect. MLV can be added to the drywall facing the room. Egg crates, used carpet, foam or rubber reduce less sound. Acoustical curtain panels, made from thick, quilted fiberglass may be too heavy to suspend from the ceiling. Make sure the drywall and soundproofing materials are caulked or taped where the ceiling meets the walls. Even the best soundproof ceiling will not keep out all noise if the walls and windows remain untreated.
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