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Old 07-14-2012, 03:44 PM   #1
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Basement Insulation - Which XPS Foam


Hi All - I'm getting ready to refinish my basement and want to start with applying 2 inch XPS foam insulation to the exterior walls. In searching around and visiting a few stores, there are a few options out there (green guard, multiple foamulars, etc). Any advice on which foam board to use that will do the job and keep the costs reasonable?

Thank you.

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Old 07-14-2012, 05:05 PM   #2
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Basement Insulation - Which XPS Foam


Shop it around.

All XPS should be similar in formulation and performance.

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Old 07-15-2012, 11:12 AM   #3
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Basement Insulation - Which XPS Foam


Thanks... Will do. Is 2 inch (R10) the minimum needed? or can I get by with 1.5 inch (R7.5) or 1 inch (R5)? My basement is pretty dry & I have a sump pump and french drain. Thanks, again.
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Old 07-15-2012, 11:47 AM   #4
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Basement Insulation - Which XPS Foam


The insulation does not have any impact on the bulk moisture issues.

Are you going to be studding the walls or just putting on furring strips and hanging drywall from that?

If you are studding out the wall, 1.5" should be good and then insulate the 2x4 walls with unfaced fiberglass.
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Old 07-15-2012, 03:22 PM   #5
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Basement Insulation - Which XPS Foam


OK. I appreciate the response. I'm going to stud out the walls and leave a 1-2 inch gap between the stud walls and the foam insulation. Thank you.
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Old 07-15-2012, 04:50 PM   #6
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Basement Insulation - Which XPS Foam


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Originally Posted by npiergal View Post
OK. I appreciate the response. I'm going to stud out the walls and leave a 1-2 inch gap between the stud walls and the foam insulation. Thank you.
Why?

I understand that if the walls are out of plumb you have to make your wall plumb, but using the studs to keep the wall in place is an easy and effective reinforcement of the foam's adhesion to the wall.

Don't leave and air gap that isn't insulated.
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Old 07-15-2012, 06:35 PM   #7
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Basement Insulation - Which XPS Foam


Well, I have a french drain that has about a gap around the entire basement, so I wanted to pull the stud wall away from the drain. Also, I wanted to leave a open space so there would be some air flow if there was ever any moisure. Lastly, I was thinking a 1 inch gap would be helpful if I ever wanted to run any additional wiring, etc.
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Old 07-15-2012, 07:04 PM   #8
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Basement Insulation - Which XPS Foam


So you have an internal french drain/weeping system?

That changes the insulation schedule in my mind considerably.

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