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Old 05-21-2013, 01:15 PM   #1
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Basement - Insulation the wall or frame?

I'm reading in circles can anyone help. I've read a lot of posts and obviously everyone is in a different location and home construction.

I'm in Northern NJ. My basement wall is pictured, it has a waterproofing membrane on the block that runs into a weeping drain system into a sump pump.

I'm going to frame the wall up against this membrane. Can I use Roxul in the frame and leave the concrete wall as is?

And/Or I spray foam the rim joist to seal them Or maybe the Rim joist and block down to the membrane?

Does anybody have an opinion on that?
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Old 05-22-2013, 08:15 PM   #2
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I don't know the answer to your question, but someone that does would probably want to know a few more things. Do you have a dry basement now? Have you done a tape foil or plastic to the block wall moisture test?


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Old 05-26-2013, 09:39 AM   #3
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I'm in a similar situation.
If you can afford to spray, then yes i would spray th rim joist and block wall down to the membrane. However Im not not sure if you should spray the membrane or use roxul or similar insulation, maybe xps board. But i am curios to hear what other have to say.
fyi, my feedback is of a novice one.
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Old 05-27-2013, 08:55 AM   #4
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At a minimum, seal up the band joist locations. There are a ton of different applications and methods discussed on this forum as to how to accomplish this (foam board, spray foam, etc).

As far as the walls go, spray foam will be the easiest and most effective.

After that, XPS on the basement wall works well.

Roxul (rockwool) is also a great batt option for basements.

Be sure the drywall is airtight.
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