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Old 01-03-2014, 06:38 PM   #1
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Air Seal Rim Joist with Quad?


I'm in the process of air sealing the band joist cavities in my new (to me) place. It's a ranch built on a full unfinshed basement. The interface between the rim joist and poured concrete foundation walls is gasketed but I'm considering air sealing this interface as well. I'll know better how well the existing gasket works once I seal the rim joist cavities.

The common material for sealing the rim joist to foundation interface seems to be one part expanding foam. I would actually prefer a caulk type product. Would quad be an appropriate product for air sealing between the concrete foundation and rim joist? The stuff wears like iron sealing wood to wood and OSI claims it bonds well to concrete. Thoughts?
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Old 01-04-2014, 07:13 AM   #2
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Not suitable for interior use in my opinion.

Low VOC does not equal No VOC.

It still puts off some good fumes.
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Old 01-04-2014, 09:43 AM   #3
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The VOC issue is something I have considered and certainly wouldn't be looking forward to the first three days while it cures. Silicone caulk does a great job on the wood to wood interfaces, but what would be appropriate to air seal the wood to concrete interface? Or maybe there isn't an appropriate caulk which is why urethane foam is the go to product for this application?
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Old 01-04-2014, 02:47 PM   #4
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Compare chart enclosed; http://www.google.com/url?sa=t&rct=j...,d.cGU&cad=rja

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Old 01-04-2014, 06:27 PM   #5
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Gary, that Geocel looks like just the product for sealing the sill/foundation gap. Certainly not cheap. Looking at comments online, there appear to be many people who use it for sealing wood/wood joints throughout. A bit pricey compared to silicone but it may very well hold up longer inside those inaccessible walls.

Several places in my area seem to carry it.

Thank you for the pointer.
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