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Old 10-12-11, 07:30 AM   #1
Daox
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Default Sill plate sealing

My home, being as old as it is is just wood on a field stone basement. So, I would love to seal the sill plate as I know its a major source of air leakage. I believe I've seen a few videos and/or write ups that say to use acoustic sealant for sealing the sill plate. I went to the store the other day in search of said product and apparently I'm not familiar with the actual name this goes by because I could not find it. Any tips here, or should I just use caulk (what kind?) and/or spray foam (picked up a great stuff gun, woohoo)?

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Old 10-12-11, 07:43 AM   #2
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I would fill it with expanding foam, vacuum it clean first, or shoot it with compressed air.
I have a stone foundation as well and the gaps vary a great deal, if it was a straight even gap then caulk could work, but adding insulation and sealing it in one shot is always a plus.
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Old 10-12-11, 09:21 AM   #3
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Acoustic sealer is the sealer they use for sealing joints when installing vapour barrier. My garage was insukated and vapor barrier installed about 16 years ago. When I installed my popcan heater I took a sheet of gyp-roc off the wall to cut my vent holes and the acoustic sealant was still soft and sticky, pretty much like when I applied the stuff. When I used to do construstion work we call it Black Death. The sealant was black and if you ever got any on you, you would have to scurb till you just about died.
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Old 10-12-11, 09:31 AM   #4
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Is there another name for it? I swear I looked at every bin with caulk, construction adhesive, and all the other stuff and I saw nothing that said acoustic sealant.
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Old 10-12-11, 10:02 AM   #5
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Here is a link to the sealant that I have used Home Hardware - SEAL, ACOUSTICAL 300ML (G)

I still have a partial tube that is 12 years old and it is still usable.
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Old 10-12-11, 04:41 PM   #6
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Quote:
Originally Posted by madmike View Post
Acoustic sealer is the sealer they use for sealing joints when installing vapour barrier. My garage was insukated and vapor barrier installed about 16 years ago. When I installed my popcan heater I took a sheet of gyp-roc off the wall to cut my vent holes and the acoustic sealant was still soft and sticky, pretty much like when I applied the stuff. When I used to do construstion work we call it Black Death. The sealant was black and if you ever got any on you, you would have to scurb till you just about died.
I know what you mean mike... sticky stuff. next time you get any on you, spray it with WD-40 and it will wipe right off!
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Old 10-12-11, 05:01 PM   #7
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Tremco is a popular brand. It's only really used for tight cracks and, as has already been mentioned, for adhering to poly. It's one of the only things that will stick to it. The stuff is crazy. I have taken apart a wall that was over 25 yrs. old and found it to still be goopie.

And acetone will take it off.

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