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Nov 14, 2018 at 13:31 comment added granadaCoder Thanks Kris. With your tips, I (eventually) came across this. youtube.com/watch?v=1j0UurpIKAA&feature=related (which is an electrical knife mounted upside down in a router table)
Nov 14, 2018 at 13:21 vote accept granadaCoder
Nov 14, 2018 at 6:11 answer added Jimmy Fix-it timeline score: 5
Nov 14, 2018 at 4:31 comment added Alaska Man You could run your utility knife against a straight edge. You can also cut it with a circular Saw and a straight edge.
Nov 13, 2018 at 22:31 comment added Daniel Griscom You'll never get an air-tight joint between the rafters and the pieces of rigid foam. How about leaving a deliberate 1/4" gap, and filling with spray foam?
Nov 13, 2018 at 22:18 comment added Kris Try a jig saw with a long blade or google hot wire foam cutting
Nov 13, 2018 at 21:51 comment added granadaCoder As stated. I get "wobble". When I break the rigid foam, that little wobbles throw off the clean break. I have 3.5 inch thick rigid foam. I need to cut both sides of the foam and need the (not all the way through) cuts to be perfectly in line with each other. Also, the cut pieces are going in between rafters, so to prevent any air passage, I need a really clean cut. Using table saw causes too much nasty dust. Thanks.
Nov 13, 2018 at 21:48 comment added Daniel Griscom Hello, and welcome to Stack Exchange. Unfortunately, "shopping" questions are off-topic here. That said, why don't you just run the knife against the straightedge?
Nov 13, 2018 at 21:00 review First posts
Nov 13, 2018 at 21:48
Nov 13, 2018 at 20:59 history asked granadaCoder CC BY-SA 4.0