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Acoustical caulk/sealant confusion

I keep hearing the term "acoustical sealant" in the context of air sealing, as in "use acoustical sealant for air sealing because it remains flexible", but am a little bit confused as to what it means. Does it refer to:

  1. Tremco accoustical sealant, the specific product?
  2. Any caulk or other sealant that exhibits the "remains flexible forever" property?
  3. Something else entirely?
Asked by Aaron Birkland
Posted Aug 29, 2014 9:24 AM ET
Edited Aug 29, 2014 9:59 AM ET


5 Answers

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Tremco is by far the best known manufacturer of acoustical sealant, but it is a type of sealant and yes, other people make it. OSI I believe has a low- or no-VOC product, who knows if it holds up as well long-term to Tremco (aka Black Death).

Answered by Dan Kolbert
Posted Aug 29, 2014 9:35 AM ET


Thanks, Dan.

So if acoustical sealant represents a type, then is there a way to determine if an arbitrary tube of caulk is an acoustical sealant? Will it have the word "acoustical" on the tube somewhere, or is there some other way to tell?

Answered by Aaron Birkland
Posted Aug 29, 2014 9:48 AM ET


The answer to your question is yes -- if the product is acoustical sealant, it will have the word "acoustical" on the tube. Most people just buy the Tremco product, which has been around for decades.

Answered by Martin Holladay, GBA Advisor
Posted Aug 29, 2014 10:03 AM ET


OSI is what my builder used and after 1.5yrs it has held up very well and is still very nasty/gooey in our unfinished basement (walkout basement , framed/insulated/poly wall).

I have found it locally at Menards in the large tube - Tremco i have had trouble finding (couldn't find in stores).

Answered by Nick T - 6A (MN)
Posted Aug 29, 2014 2:27 PM ET


Hi Nick T,

Do you know which OSI product was used on your house?


Answered by Ryan Ouimette
Posted Jan 7, 2015 5:06 PM ET

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