To soundproof a room effectively, you have to make sure there are no areas where noise can "leak" in or out, such as through the gaps between soundproofing panels. Acoustical caulk is a specially formulated sealant designed for soundproofing applications.
According to Sarinne Fox, an engineer who maintains a website on noise-reduction technologies and techniques, what distinguishes acoustical sealant from "regular caulk" is that it remains permanently flexible. By staying pliable rather than hardening, the caulk will continue to absorb sound rather than reflect or transmit it.
Where to Use It
Fox recommends applying acoustical sealant liberally in the joints between soundproofing materials as well as around electrical outlets, light and plumbing fixtures, wall-penetrating pipes, windows and other areas where the soundproofing surface is interrupted.
Application and Cleanup
Application instructions for acoustical caulk are essentially the same as for any other caulk. Make sure surfaces to be caulked are clean, dry and free of dust. Because formulations differ, check the label of the specific product you're using for the maximum size of the gap that can be filled. Acoustical caulk can usually be cleaned up with soap and water while wet. Once the caulk dries, though, you'll have to scrape off the excess. Again, formulations differ, so make sure to check the cleanup instructions on your product.
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