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Old 12-02-2012, 09:56 PM   #1
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How to cut and seal insulation


I was wondering what you guys thought the best way to cut 2" xps rigid foam board. Tools I have at my disposal are a table saw, circular saw, jigsaw, and simple knife. Can it be scored and snapped. I just want it to be a nice clean cut no matter what it is.

Also, they are 4x8 pieces so what would be the best way to seal them together? Simply joist tape? Thank you.

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Old 12-02-2012, 10:52 PM   #2
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How to cut and seal insulation


I would imagine the circular saw would give you the best cut. You certainly wouldn't be able to cut a 4x8 board on a table saw...

I used Tyvek tape when I put my boards together along with PL 300 adhesive on the walls.

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Old 12-02-2012, 11:26 PM   #3
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How to cut and seal insulation


Yeah i realized after i typed that, that it might be abit too big for the table saw lol. Yeah I bought the PL 300 as well. How much did you use per board?
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Old 12-03-2012, 12:02 AM   #4
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How to cut and seal insulation


saws make a lot of "dust" which blows everywhere, and static makes them a PITA to clean up. a hand saw is the best in that regard. i find that if i cut them w/ a knife on both sides, sheets snap pretty nicely & w/ little dust.
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Old 12-03-2012, 07:43 AM   #5
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How to cut and seal insulation


I also perfure using a knife to cut it.
Just use some spray foam to fill any gaps or flaws once it's all up.
I use a cheap throw away plastic putty knife to smooth off the foam.

One other way that I did many years ago was install the blade backwards in a jig saw. It sort of melted it's way through and made almost no dust.
I've only done it that way once, and that was 10 years ago but it worked.
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Old 12-03-2012, 06:00 PM   #6
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How to cut and seal insulation


The dust I can deal with, just looking for which option will give me the smoothest cut.
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Old 12-03-2012, 06:03 PM   #7
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How to cut and seal insulation


Utility knife with a sharp blade works well.
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Old 12-03-2012, 10:15 PM   #8
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How to cut and seal insulation


Good call. I went out and got a drywall blade for my utility knife and it scored and snapped like a charm. Thanks everyone. Now for the next part. Does anyone know the cure time for PL 300 adhesive?
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Old 12-03-2012, 11:39 PM   #9
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How to cut and seal insulation


Actually I finally found it. 20 minutes to set and 7 days to cure...what the. Does it have to be braced against the wall for those 7 days? sheesh.
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Old 12-04-2012, 08:35 AM   #10
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How to cut and seal insulation


I braced mine overnight. Never had a problem. Shoot out a little dab and see how hard it gets in 24 hrs. My sheets were wedged snug between the joists and floor.

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Old 12-05-2012, 12:54 AM   #11
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How to cut and seal insulation


So I cut, glued and placed the xps boards on 1 wall tonight. They're being braced by whatever I could find around the house lol. Should 24 hours be enough to take the braces down?

Also, How do i go about sealing the xps at the corner. I have 1 side that is cornered to concrete, it's a small indent coming in about 5 inches from the main wall(only finishing half the basement) and another corner that will take more xps on the perpendicular wall. Thanks.
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Old 12-05-2012, 07:23 AM   #12
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How to cut and seal insulation


The glue should be dry by then. Whether it holds very well is another story.
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Old 12-05-2012, 03:03 PM   #13
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How to cut and seal insulation


Ok good. So does anyone know how best to seal those corners in my above post?
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Old 12-05-2012, 07:07 PM   #14
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How to cut and seal insulation


Would just sealing it with the PL-300 caulk be adequate for the floor and corners?
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Old 12-05-2012, 08:23 PM   #15
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How to cut and seal insulation


Anyone?

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