Rim joist retro insulation with spray foam?
pjb999
15 years ago
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velvetfoot
15 years agoRelated Discussions
How to insulate without rim joists?
Comments (9)Hello, Many thanks, as always, for the speedy replies. I'm afraid, though, that I probably wasn't as precise as I should have been. My fault. I fully expect to use XPS between the joists perpendicular to the wall, cut to fit, and sealed with caulk or Great Stuff. No need to use the spray foam as they are doing in the pictures. What I was wondering about is what I should use to fill the space between the joist that runs _parallel_ to the cinderblock wall and the cinderblock wall itself. In my original picture, it's that dark gap that starts in the center at the top of the photo and then "runs" away from you toward the bottom of the photo. That gap is the entire height and length of the joist (but the gap is not even and there are various random mortar protrusions, some of which you can see in the picture). Should I use Great Stuff to fill that void, before I start adhering my XPS sheets below that? If not, what should I put up in that void (because I don't have a rim joist)? Thank you very much! Tiger...See MoreInsul-cube for rim joist insulation
Comments (2)Stopping air leaks from the exterior is only part of the story. You also need to stop warm interior air from hitting the rim from the inside and condensing there into ice and feeding mould growth on the fibrous insulation in the rim. Do those bags create an air barrier to inside air? How are they affected by moisture? If you wouldn't blow in netted cellulose to rims, is there a difference if you put it in a bag? Not for me. Afraid I'm a fan of spray foam, even when you are required to cover it with a thermal or ignition barrier....See MoreInsulating the rim joist in crawlspace
Comments (3)mightyanvil is correct. While foam insulation is usually a great way to insulate crawlspaces, building codes prohibit foam insulation from being used underground in areas of known termite activity....See MoreInsulating rim joists
Comments (1)You can scribe/cut and break them off. We always add glue to them when putting them in so they don't get lose and fallout due to the floor vibration, you should add some glue also....See Morepjb999
15 years agoandrelaplume2
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12 years ago
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