Acoustical Caulking Question

 
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Old 08-23-2015, 12:09 AM   #1
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Acoustical Caulking Question


Excuse my ignorance if I've missed something obvious. But WHY is acoustical caulking required on double framing members? I see guys caulking every double stud and all around the window and door headers, etc. and then cover it all with poly and seal the edges. I thought the poly was the air barrier and the caulking was to seal the joints and edges. What good does it do to smear this stuff in the crack between 2 studs? I've never done it or been called on it though I've been lead to believe its code. Clue me in.....
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Old 08-23-2015, 12:20 AM   #2
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Re: Acoustical Caulking Question


Quote:
Originally Posted by Anthill View Post
Excuse my ignorance if I've missed something obvious. But WHY is acoustical caulking required on double framing members? I see guys caulking every double stud and all around the window and door headers, etc. and then cover it all with poly and seal the edges. I thought the poly was the air barrier and the caulking was to seal the joints and edges. What good does it do to smear this stuff in the crack between 2 studs? I've never done it or been called on it though I've been lead to believe its code. Clue me in.....
If 0 degree air blows between studs, and makes it to the back of the drywall the system has failed. Even if it can't enter a stud bay, if it is to the back of the drywall it is to far.

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Old 08-23-2015, 10:14 AM   #3
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Re: Acoustical Caulking Question


so the idea is for that 1/32 of caulking to provide enough insulation to keep cold from reaching the poly/drywall?
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Old 08-23-2015, 12:01 PM   #4
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Re: Acoustical Caulking Question


I'm not familiar with putting acoustical sealant between a king and jack stud (I think that's what you're talking about). If you are trying to air seal at that point in the building envelope you are too late.
But acoustical sealant is used to prevent air leakage not provide insulation.
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Old 08-23-2015, 09:24 PM   #5
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Re: Acoustical Caulking Question


that's what I always thought. I might have to dig into it a little more and see if I can find a reason for it.
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Old 09-03-2015, 09:49 PM   #6
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Re: Acoustical Caulking Question


Depends on what the wall system is using for an air barrier. Air tight drywall? Membrane behind finished wall? Interior plywood/osb with service cavity? Exterior sheathing as air barrier?

Normally acoustical sealant or neoprene gaskets are used for air tight drywall. Caulking the stud joints of an interior parition wall where it meets an exterior wall is one example. You don't want air drafting around or between that stud into your interior parition wall cavities.
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Old 09-05-2017, 02:59 PM   #7
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Re: Acoustical Caulking Question


When i do it, i always assume its acting as a more direct air barrier, reducing any changes of currents happening between the poly and framing members if the drywall doesn't sit flat enough to seal them. this is especially true when framing members aren't perfectly flush, possibly allowing convection currents to happen and therefore drawing more air in through gaps, like in between the king stud and trimmer.

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