How to seal a dryer vent going through foundation?


Old 01-22-05, 12:37 PM
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Join Date: Jan 2005
Location: northern, NJ
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How to seal a dryer vent going through foundation?

I have a gas dryer and the vent is going through my foundation to the outside of the house. It's the standard shinny sheetmetal vent that goes through the foundation. Right now it's not really even attached to the foundation, it just sorta goes throught it and cold air can get in on the sides of this vent. What is the best way to seal it up around the vent so cold outside air doesn't get into my washer/dryer room? I saw this foam stuff, then there is caulk, silicone, etc.. I just don't know what is the best to use to to seal up leaks through a foundation wall... thanks!
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Old 01-22-05, 02:04 PM
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Hi Squale,
- you need something with a bit of 'flex' in it due to expansion/contraction of the tubing. I'd use 'butyl' caulk at both ends. Blow all dust away first, to ensure it will stick to the concrete. Get a good covered flapper outlet unit to ensure cold air can't be blown back up the tube.

Do it Right - Do it once.

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