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Old 11-25-2014, 08:52 PM   #1
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My Rim Joist Air Sealing Fun...


Well I knew I had some air sealing needed in the rim joists (pic 4) but when I pulled out the batt insulation in a few bays. I didn't expect to see the backside of the aluminum siding though!

My original plans were to caulk all around then add 2" of polyiso rigid foam in each bay using caulking to hold it in place.

With that hole though (pic 1), should I patch with say 1/4" plywood first?

I also found another couple of rim joist bays that have nothing in them, all I see is the backside of the aluminum siding. (not pictured) I'm thinking I may need to take that siding off and patch in a new rim joist.

Also, I have a large gap between a partial interior (one side is a crawlspace)/exterior (closest to the hole in the siding) foundation wall (pic 3). Should I slide and/or pound in a pressure treated 2x4 with some sort of gasket material?
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Old 11-25-2014, 09:05 PM   #2
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My Rim Joist Air Sealing Fun...


You should seal that hole with something. And it's too bad the builder did not lay down sill plate seal between the sill plate and the foundation wall.
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Old 11-25-2014, 09:20 PM   #3
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My Rim Joist Air Sealing Fun...


Will definitely seal up the hole, thinking some 1/4" ply with caulking all around, followed up with the rigid foam caulked in place for air sealing and insulation value.

The top of the foundation wall is just plain nasty with dirt and most likely mouse droppings as we have had some issues with them. I sprayed the top down with diluted bleach and was using disinfecting wipes to wipe it all up, but there is so much crap there not sure how to handle it all.

I know you aren't supposed to use a vacuum, but maybe a shop vac with a hepa filter?
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Old 11-26-2014, 11:35 AM   #4
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My Rim Joist Air Sealing Fun...


I would tack some plywood in there prior to the rigid foam and sealing.
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Old 11-26-2014, 08:11 PM   #5
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My Rim Joist Air Sealing Fun...


I use a vac all the time.
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Old 11-26-2014, 10:10 PM   #6
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My Rim Joist Air Sealing Fun...


Got delayed picking up the rigid foam board due to my son coming down with a fever. He's better now but couldn't head out to the insulation supply house.

Used 7/16 osb for the patch, a bead of caulk on the back around the hole, and decking screws to hold it in place.

Air sealed a few more bays using Alex Fast Dry from DAP.

Will use the PL Premium for the sill plate to foundation sealing. Whatever was used prior is coming off in places so would really like it to stick.

Only 30 more bays to go...
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Old 11-27-2014, 10:46 AM   #7
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My Rim Joist Air Sealing Fun...


Looking good.

Now insulate with some rigid foam, seal the sill plate to foundation connection, back with batt insulation, and admire your work.
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Old 12-06-2014, 08:05 PM   #8
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My Rim Joist Air Sealing Fun...


HDS, caulking around the rim joist and sill plate is interesting. Never thought of that.

Could you use spray foam (the Great Stuff kind) to do that, or is caulking better?

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Old 12-07-2014, 12:24 AM   #9
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My Rim Joist Air Sealing Fun...


Tee, caulking makes a flatter seal for when I add the rigid foam insulation. The gap between the rim joist and sill plate is pretty small, so it is easier to force cualking into the gap. Plus it is a first line of defense against air infiltration. I'll use great stuff for holding the rigid foam in place as the gaps are much bigger.
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Old 12-12-2014, 06:53 PM   #10
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My Rim Joist Air Sealing Fun...


Nice job. Can you come to my house when your done?

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