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

Tags: , cutting fiberglass insulation, electric carving knife, utility knife

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. 

   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 (10¼” thick vs. 12″ for regular insulation). I don’t know about availability.
   Good luck with your project!

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