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Soundproofing
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=== Ceilings === [[File: Ceiling Soundproofing.jpg|alt=Apartment Ceiling Sound Soundproofing, Soundproof Sheetrock, Resilient Isolation Channel, Viscoelastic Compound, Sound Proof Insulation|thumb|Apartment ceiling soundproofing]] Sealing gaps and cracks around electrical wiring, water pipes and ductwork using acoustical caulk or spray foam will significantly reduce unwanted noise as a preliminary step for ceiling soundproofing. Acoustical caulk should be used along the perimeter of the wall and around all fixtures and duct registers to further seal the treatment. [[Mineral wool]] insulation is most commonly used in soundproofing for its density and low cost compared to other soundproofing materials. [[Spray foam]] insulation should only be used to fill gaps and cracks or as a 1-2 inch layer before installing mineral wool. Cured spray foam and other [[closed-cell foam]] can be a sound conductor. Spray foam is not porous enough to absorb sound and is also not dense enough to stop sound.{{citation needed|date=August 2021}} An effective method to reduce impact noise is the "resilient isolation channel".<ref>{{Cite book|last=Long|first=Marshall|url=https://books.google.com/books?id=XTYTAAAAQBAJ&q=Resilient+Isolation+Channel&pg=PA579|title=Architectural Acoustics|date=2014-02-05|publisher=Academic Press|isbn=978-0-12-398265-0|language=en}}</ref> The channels decouple the drywall from the joists, reducing the transfer of vibration.
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