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Old 05-01-2012, 01:05 AM   #1
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Rim Joist insulation


I've been adding foam board with Great stuff in the rim joists. But, I've got some overhangs where some A/C vents go into and there isn't enough room to properly install the XPS with great stuff around it. What is the best way to insulate around the A/C vents?

In this case, the joists go about 2' past the foundation.
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Old 05-01-2012, 01:14 AM   #2
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Rim Joist insulation


Just stick some fiber glass insulation in the best you can. It's Got to better then it was when your done.

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Old 05-01-2012, 09:34 AM   #3
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Rim Joist insulation


Roxul or Fiberglass.

Roxul is more air impermeable than fiberglass and a bit easier to cut into shapes.
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Old 05-01-2012, 09:17 PM   #4
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Rim Joist insulation


what is on the other side of the foundation ?
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Old 05-01-2012, 10:53 PM   #5
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Rim Joist insulation


See if that register boot will push upward after removing the nails in the sub-floor to install the f.b. Just tin snip off the extra or buy a close-bend boot. Ideally. for optimum value would be adding f.b below the joist bottoms and replacing the soffit wood outside. This would prevent "radiation" and provide a thermal break from the ground/outside air temp. and the joist which is R-1.25 per inch.....http://www.buildingscience.com/docum...n-crawlspaces/

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Old 05-06-2012, 10:38 PM   #6
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Rim Joist insulation


When insulating the rim joist do you:

1. Cut foam to fit rim and spray foam around it

OR

2. Caulk rim, insert foam and then spray foam?
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Old 05-10-2012, 12:12 AM   #7
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Rim Joist insulation


#2 to air seal the rim as it expands/contracts with the seasons; pp.51, http://books.google.com/books?id=iwS...rafter&f=false

http://www.buildingscience.com/docum...l_seal_rev.pdf

http://www.conservationtechnology.co...eakagePathways

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Old 05-10-2012, 08:04 AM   #8
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Thanks Gary. You've been a huge help with all of my projects so far...
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Old 05-15-2012, 08:57 AM   #9
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Here is my progression with the rim joists.

I also have a basement project where you can see the whole project...

2012 - Basement demo
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Old 05-15-2012, 09:30 AM   #10
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Rim Joist insulation


spray foam works good also

Last edited by hammerlane; 02-24-2013 at 06:48 PM.
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Old 05-15-2012, 09:37 AM   #11
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Indeed. How much did that run you for just your rim joists?
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Old 05-15-2012, 09:59 AM   #12
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Rim Joist insulation


Quote:
Originally Posted by Trucon01 View Post
Indeed. How much did that run you for just your rim joists?
$800 for 166 lineal feet of rim joists and a 200 sq foot of wall space in an attic area above a garage.

Attached are a few photos:

The top 3 are of the attic area above the garage. The last is my basement setup.

After they did the spray foam in the attic area I fluffed up all existing batt insulation and laid new batts across the joists.

Last edited by hammerlane; 02-24-2013 at 06:48 PM.
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Old 05-15-2012, 06:26 PM   #13
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You have a chandelier in the attic? Very classy.
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Old 05-15-2012, 07:10 PM   #14
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Quote:
Originally Posted by M3 Pete View Post
You have a chandelier in the attic? Very classy.

Yeah right. Took it out of the dining room when we moved in and put in a ceiling fan. Been trying to sell it but no takers yet. Figured its safer in attic than down in basement.

Actually the 1st photo below shows when I still had batt insulation in the rim joist cavities.

Last edited by hammerlane; 02-24-2013 at 06:49 PM.
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Old 05-15-2012, 11:54 PM   #15
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Rim Joist insulation


Looks good! I was surprised while researching that 1/16" air gap will admit moisture to the rim joist. Just caulk the joints/small holes the SPF missed.

If the attic is not used for storage or attics not joined, an ignition barrier only is required over the SPF for fire-safety;http://publicecodes.citation.com/ico...016_par007.htm

if used for storage; a thermal barrier is required per Code: http://publicecodes.citation.com/ico...016_par003.htm
Some foams are acceptable, ask your local Building Department.

Is there soffit venting, as I don't see the air chutes there?

Gary

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