Home Improvement Expert Danny Lipford

How to Cut Fiberglass Insulation Fast

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While fiberglass insulation is usually cut with a utility knife, as demonstrated in our Cutting Insulation video, one of our viewers came up with a novel idea which worked great and gets the job done in a hurry. Here it is:

“We were insulating our bonus room with R-38 bats in the ceiling, and about two-thirds of the way through the job I wished out loud that I had a longer knife to cut the 12″ thick bats. Then it occurred to me: MY ELECTRIC CARVING KNIFE!!!

“It’s incredible how easily it works and can even cut the kraft paper, though I usually use scissors for that.”

Heather
LaCrosse, Virginia



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2 Comments on “How to Cut Fiberglass Insulation Fast”

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  1. Heather Says:
    June 8th, 2010 at 1:38 pm

    Here I am again!! Is there a more compact version of the R-38 that has the same value?? I know there is for R-30 and itis called C-30

  2. Official Comment:

    Ben Erickson Says:
    June 8th, 2010 at 3:47 pm

    Hi Heather,
    Several companies either do or used to make high density (also called high performance) R-38C insulation (10ΒΌ” thick vs. 12″ for regular insulation). I don’t know about availability.
    Good luck with your project!

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