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Thread: Cutting polysio foam insulation with a track saw

  1. #16
    Join Date
    Mar 2003
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    SE PA - Central Bucks County
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    57,862
    Whatever method you choose, accuracy will be a good thing, not just for visual appeal, but also because it cuts down the amount of sealing you'll need to do along the edges of the material. Straight cuts and a snug fit are a good thing.
    --

    The most expensive tool is the one you buy "cheaply" and often...

  2. #17
    Join Date
    Nov 2016
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    Itapevi, SP - Brazil
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    Jigsaw with appropriate blade

    If you are looking for a saw to cut a such insulation, consider a guided jigsaw with appropriate blade.

    Bosch makes blade specific for it but I guess it can be done by other manufacturers also. These blades are toothless and have some kind of waved knife like cut similar to traditional bread knife.
    All the best.

    Osvaldo.

  3. #18
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    Jan 2008
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    1.5 hrs north of San Francisco, CA
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    I switched to a thin putty knife sharpened along its side, after trying a serrated knife and twin-blade electric knife (which is the cat's meow for soft foam cushions, BTW). The putty knife's length makes cutting straight lines especially easy. Cuts are clean and beautiful. I don't remember where I saw this tip, but it works great.

  4. #19
    Join Date
    Dec 2019
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    Columbus, OH
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    122
    Quote Originally Posted by Wayne Cannon View Post
    I switched to a thin putty knife sharpened along its side, after trying a serrated knife and twin-blade electric knife (which is the cat's meow for soft foam cushions, BTW). The putty knife's length makes cutting straight lines especially easy. Cuts are clean and beautiful. I don't remember where I saw this tip, but it works great.
    I saw a similar tip as well. I just use a big knife since my use was limited to about 3 sheets of it. If I had more I would have sharpened up a putty knife. I tried using my circular saw, but found the dust it made stuck everywhere and was a huge pain to clean up.

  5. #20
    Join Date
    Sep 2016
    Location
    Modesto, CA, USA
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    6,284
    Used a big kitchen knife and it went well today. After I cut it I shaved it back a few degrees so it fit in better here and there. Still made a big mess. Not as messy as styrofoam. I cut once at about 60 degrees to the travel maybe one inch deep then came back and went all the way through 2" deep pushing and rocking the blade on both ends.
    Bill D

  6. #21
    Join Date
    Nov 2006
    Location
    N.E. Ohio
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    5,911
    Mafell makes this little gem of a track saw for cutting insulation.
    https://www.timberwolftools.com/mafe...insulation-saw
    My granddad always said, :As one door closes, another opens".
    Wonderful man, terrible cabinet maker...

  7. #22
    Join Date
    Jan 2010
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    Tampa Bay, FL
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    2,738
    Quote Originally Posted by Rich Engelhardt View Post
    Mafell makes this little gem of a track saw for cutting insulation.
    https://www.timberwolftools.com/mafe...insulation-saw
    IDK. $3800 saw vs pilfered knife. That's a tough call.
    - When God closes a door, he opens a window. Our heating bill is outrageous & six raccoons got in last night. Please God, this has to stop!
    - Outside of a dog, a book is man's best friend. Inside of a dog, it's too dark to read.

  8. #23
    Join Date
    Nov 2006
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    N.E. Ohio
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    $3800 saw
    That's the cheap one! :O
    The upgraded one is over 8 grand. It comes with the dust collector & table.
    My granddad always said, :As one door closes, another opens".
    Wonderful man, terrible cabinet maker...

  9. #24
    Join Date
    Mar 2003
    Location
    Upland CA
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    4,900
    Installers that I have seen all seem to wear a knife. Bread knife works great for me.
    Rick Potter

    DIY journeyman,
    FWW wannabe.
    AKA Village Idiot.

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