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Discussion Starter · #1 ·
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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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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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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Discussion Starter · #8 ·
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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Discussion Starter · #11 ·
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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Hey don't rule the table saw idea out just yet, if you havent already completed this project. Depending on whether you have enough outfeed and side feed support around your saw, and its rip capacity, we use 2"xps all the time at work and unless it's a random small peice or doesnt break on one of the joints we used the table saw for any repetitive cuts. Nice clean edge for tight fit. It does make a pink mess.Im just speaking from personal experience, not sure if its right or wrong but it does yield good results. Good luck with your project
 
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