Cut wall insulation clean and fast with this jig made from two boards and an old door hinge. Cut a 2x4 and a 2x8 4 in. longer than the width of the insulation. Connect them with the hinge. Then open the jig and slide in the insulation. Press down on the 2x4 to compress the fiberglass and slice along the 2x4 with a utility knife. Clean cuts every time.



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