I have the pink rigid foam insulation which I wish to cut for the exterior of my basement walls in the rafter area.
1.) What is the best method to cut this foam board - with an utility knife?
2.) The first area I am working on is just for storage, can I simply cut for the rafters? Would the foam just in the rafters be worth the effort of all the various cuts? My plan was to cut each one for these small spaces and then add the foam around the perimeter of the foam to completely seal. I think are floors are very cold because this space is open.
Just use a normal handsaw. The best bet is to measure the space then score the board with a straight edge first. If you make it a tight fit you can just wedge it in. It's very easy to cut through with a saw, but you'll probably want a face mask as you don't want to be breathing the stuff in.
Why are you using foam board. in the rafters. you may not get an acceptacble R value with Foam . encapusated fibre glass is much better and easier to install with very little cutting. With foan board you really do not need a mask but use one to be on the safe side. Definitley use a mask with teh fibre glass
Like others have said, I would install some fiberglass batts instead of the foam. If you're insistent on using the foam, then you can cut it with either a normal utility knife or the safe method, a hand saw.
Also, make sure you look out for pipes or wiring in the rafters when you're installing your insulation.
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