Difficult Rim Joist Insulation
10 years ago
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Insulating rim joists
Comments (6)I understand what they are saying, but...I have done a lot of research on this and including on these forums rigid foam seems to be the way people are going with this. You can check out some great videos in you tube also. Can we know for sure our basements have no humidity or moisture issues? I know I have to run a dehumidifier in mine in the summer, but over all it is pretty dry. The other issue some folks have raised is even with the rigid foam you have to make sure it is pretty tight so that moisture does not build up behind it and cause rotting of the rim joists. So much to think about. That is why I may just go with the spray foam despite the cost. I have some pretty big holes where the vents are going through the floor. I can feel the cold on the floor in my living room and dinning room. If you google rim joist insulation you will find a lot of information and videos....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 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 MoreInsulating brick and block rim joists
Comments (2)Apply the XPS as shown in the Building Science Corp. link above. For a tight seal, you can then use handheld expanding foam insulation, such as Great Stuff around the boards....See More- 10 years ago
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