Sealing around registers


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Old 02-29-20, 06:53 AM
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Sealing around registers

EDIT: I just realized this should probably be in the energy usage / weather stripping forum, but I'm not sure how to move the thread.

I'm replacing some return register covers, and it looks like I need to seal the duct to the drywall (see picture). Is Is it better to use a foam like great stuff, silicone caulk, or dry wall putty to fill the gaps before taping? Is metal tape by itself enough?
 
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Last edited by JAHMD; 02-29-20 at 07:21 AM.
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Old 02-29-20, 07:56 AM
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If the new covers will cover the gaps I see no reason to fill the gaps. They are not causing any issues.
 
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Old 02-29-20, 08:07 AM
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There is noticeable cold air coming in from the gaps, so this is to create an air seal. It's an older brick house and I do not think there is much if any insulation between the drywall and the brick.
 
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Old 02-29-20, 08:42 AM
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Self-stick foam weatherstrip applied to the back of the register cover will cover the gap and seal the edge enough to prevent air infitration. Half inch or 3/4 inch wide--as much as the register overlap will allow.
 
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Old 02-29-20, 08:57 AM
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You can probably get some duct from the big box and insert it into the inside of the duct. It should have a little flange around it that is about 1/2" wide. That flange can then be caulked and pushed tight to the wall to fill and cover the gap.
 
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Old 02-29-20, 09:14 AM
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so this is to create an air seal
Then by all means gety a canof low expansion foam and start as deep inside as the nozzle will allow, fill some, wait an hour then fill more till it's oozing out then trim flush!
 
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Old 02-29-20, 10:26 AM
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If you do use foam I would recommend the Dap latex foam. It's easier to clean up with water.
 
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Old 02-29-20, 11:02 AM
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Thanks everyone, it seems like any of these options should work.

I have several registers that I expect have the same problem, so I think the low-expansion latex foam, cut flat, with metal HVAC tape over the top will be the easiest. The flanged duct makes sense, but I think I'd need to get multiples and the drywall as is might be difficult to get a great seal with caulk.
 
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Old 02-29-20, 11:09 AM
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If you do use foam I would recommend the Dap latex foam. It's easier to clean up with water.
Just to confirm, is this what you mean: https://www.acehardware.com/departme.../caulk/1096189
 

Last edited by JAHMD; 02-29-20 at 11:28 AM.
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Old 02-29-20, 11:58 AM
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Yes.

......................
 
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Old 02-29-20, 01:55 PM
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Seems like it worked pretty well and cleanup was easy. It definitely would have been a pain with the non-water cleanable foam.

Do I need to wait for it to cure or can I tape over it with metal tape at this point? Is it not going to cure without enough air exposure?

Thanks everyone for your help!
 
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