Acoustical Sound Sealants

Acoustical sound sealants are used to prevent unwanted sounds from escaping through cracks that surround lightweight cavity walls, flooring systems, wall-penetrating equipment (like air conditioning ducts), door sills and other places where it only takes a crack to cause a commotion.

Soundproof Cow carries water-based OSI® Pro-Series® soundproofing sealants that are VOC-compliant and safe to be used in both exposed and unexposed soundproofing projects. Like most sealants, they are paintable, remain flexible and also help to cut down on drafts. We highly recommend using OSI® Pro-Series® acoustical sound sealants with our in-wall isoTRAX™ Soundproofing System, or with any project that requires the completed space to achieve and maintain specific STC (Sound Transmission Class) values.

Rated for High-Performance

Formulated specifically to reduce drafts and sound transmissions, non–flammable soundproofing sealant helps achieve Sound Transmission Class values and meeting LEED requirements. Acoustical sound sealants also prevent condensation, air infiltration, offer long-term moisture barriers.

Latex-based, nonflammable sealants reduce drafts and noise transmission in all kinds of wall systems requiring sound-rated assembly. It’s also flexible, paintable and adheres securely to just about any other building material you’re using. Originally developed for commercial construction, soundproofing sealant is a must-have for noisy, multi-level office buildings, apartment complexes, hotels and residential buildings.

Where to Use Acoustic Sound Sealants

Acoustical sealant is the ideal product for filling cracks, gaps or merge points in various surfaces. Apply sound sealant to unexposed and exposed ceiling and floor runners, perimeter joints, veneer plaster systems and areas where you need a sound-rated assembly. Use it around electrical outlets, electrical boxes, HVAC ducts, cold air returns and equipment attached to wall surfaces for increased sound performance in rooms and recording studios.

How Acoustic Sound Sealants Work

Noise-proofing sealants form a flexible barrier over the areas where sound would otherwise escape to stop noise transmission. Flexibility is the key attribute.

Flexible acoustic sealant can absorb sound energy. When sound waves contact the flexible caulk, the material acts as a cushion that converts sound energy into heat and disperses it throughout the sealant.

Flexible acoustic sealant forms a longer-lasting barrier than other products. Hard sealants will crack, shrink or expand over time, which allows sound to pass through. Flexible acoustic sealants hold their form for consistent blockage.

But wait — there’s more! Soundproofing sealant is water-based. It cleans up with plain soap and water, won’t crack, harden or separate, and is UL-classified and tested. It won’t migrate, either, meaning wherever you put sound sealant, that’s where it stays. No oozing, running or thinning to mess with. Plus, it’s completely safe. Water-based sealants are non-toxic and non-flammable.

How to Apply Acoustic Sealant

One reason acoustic sealants are so popular is that they are easy to apply. You can seal numerous cracks in minutes, and the sealant will dry in two to seven days.

First, clean the surface before applying the sealant. Dust, dirt or moisture can prevent the sealant from holding properly. Scrape or sand away any debris, then use a knife or scissors to clear and widen the crack if necessary. The crack must be large enough for the material to get inside. We recommend an opening between 1/4 of an inch and 3/8 of an inch. Use a backer rod if the crack is larger than 1/2 an inch.

When the crack is ready to fill, it’s time to spray the sealant. Fill the crack entirely so there are no openings for sound to work through. Wipe away any excess sealant within 30 minutes using a paper towel or cloth.

Learn More With Soundproof Cow

Soundproof sealant is just an all-around great thing to have for quickly and easily reducing noise transmission and preventing drafts from entering a room. Hey, we’ve even got more mind-boggling things to tell you about our sound sealant if you call us at 1-866-949-9269!

I just wanted to send a quick thank you for your rapid response and helpfulness. I very much appreciated it. You have been responsive in every way all through the process. It has been a pleasure doing business with you and your company.

- T. Alexander

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