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Old 02-08-2010, 07:00 AM   #31
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Yes, I filled that gap. Sometimes with caulked in foam and sometimes with canned foam. That can foam is messy.
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Old 02-08-2010, 07:16 AM   #32
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Messy Foam


I lucked out on a NEW foam cartridge gun at the Habitat Re-Store for $20 and a case of foam later on for $5 a cartridge. Having a dial control on the cartridge gun makes this job a snap and if you use it much it 's a quick payback for the foam you save, you never have a dried up half can to throw out...there are also extension guns with long barrels and disposable extension straw tips .
If you have just a bit to foam, latex is much nicer to clean up after, especially for under your baseboards with carpet rolled back, just in case you get a drip of foam.
Bob what are your thoughts on open cell foam or closed on the wall as a thermal break with or without an air gap and then a layer of R 13 Roxul between studs?
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Old 02-08-2010, 07:21 AM   #33
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Quote:
That can foam is messy.
Thanks. Yes, it's very messy stuff, but well worth the trouble.
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Old 02-08-2010, 07:46 AM   #34
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I don't think I said it earlier, but if I had it to do over again I'd hire a foam guy.
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Old 02-08-2010, 09:40 AM   #35
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For the most part mine was a breeze and revealed a few issues behind ducting that a foam guy might have sprayed over. I think its good to know your house especially with my wiring, regradless of who does the final work, but thats why we're all here
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Old 02-08-2010, 01:17 PM   #36
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Open cell allows enough air flow to not need a space. But closed cell has more R-Value/inch and is better for use in the basement walls. I use open cell for cathedral ceilings where getting sufficient venting is tougher to do. To use the hybrid method (foam edges and batt or rigid) use the closed cell type. When using either type of spray foam the space is not needed.
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Old 02-08-2010, 02:21 PM   #37
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I understand what you were talking about now Chemist when you said you came out about 8" from the rim. Thank you for the pictures!!
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Old 02-09-2010, 06:38 PM   #38
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Is Great Stuff expanding foam compatible with XPS?
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Old 02-09-2010, 06:48 PM   #39
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yes it is. For rim joists use expanding foam, not the non-expanding or low expanding types which are used for windows and doors. The high expansion is good to get all the nooks and crannies filled.
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Old 03-17-2010, 04:51 PM   #40
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Quote:
Originally Posted by HeloOne View Post
Thanks, Bob, for the reply.

Since i won't be using duct tape to hold these drywall boxes together, what kind of tape is recommended to keep them sturdy and square?

-HeloOne

Bob,

Any thoughts on what I could use to keep the drywall boxes together?

Thanks!
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