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How to Cut Batts of Fiberglass Insulation

3 easy steps and neat trick to safely make tidy cuts in fiberglass insulation batts.

Cutting fiberglass insulation batts. Ryan Benyi

Cutting batts of fiberglass insulation takes forever because the batts are so thick and fuzzy.

What Can I Use to Cut Fiberglass Insulation?

You can use a sharp utility knife to cut fiberglass batt insulation. You’ll also want to have a scrap piece of plywood handy to help speed up the process and produce a clean, neat cut every time.

How to Cut Fiberglass Batt Insulation

  1. Lay the insulation on top of a scrap piece of plywood with its foil or kraft-paper vapor barrier facing up. Then cut a 2X4 at least 12 inches longer than the width of the insulation.
  2. Place the 2X4 across the batt on the cut line. Compress the insulation by kneeling on one end of the 2X4 and pressing down on the other end with your palm.
  3. Then use a sharp utility knife to slice through the batt in a single stroke.