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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 to and you’ll save a few hassles. To cut insulation squarely and accurately use a utility knife with snap off blade. Extend the blade all the way out and lock it. The resulting 3″-4″ 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 wear a long sleeved shirt, pants, gloves, dust mask and safety glasses