How to Cut Insulation

Hand on top of stone wool insulation
Most homes are under-insulated, so adding a layer of stone wool insulation in your attic can help trap extra heat. (Rockwool)

Adding insulation is a very do-it-yourself-friendly project that pays big dividends, so it just makes sense to take on the task yourself. If you do, remember these tips, and you’ll save a few hassles.

To cut insulation squarely and accurately, use a utility knife with a snap-off blade. Extend the blade all the way out and lock it. The resulting 3- to 4-inch blade will make it easier to cut through thick batts of insulation.

Use the straight edge of a piece of wood, lay it across the insulation, then kneel on one end of the insulation to compress it. And run the blade down the edge of the wood for a nice, square cut.

Remember, to keep the fibers from irritating your skin you need to wear a long-sleeved shirt, pants, gloves, dust mask, and safety glasses.

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