Roofs are subjected to tear and wear because of various types of weather exposure. If your roof isn't taken care of, mold and mildew can cause structural damage and costly repairs. If your roof isn't taken care of, mold and mildew can cause structural damage and costly repairs. Because of this, it is important you have the proper tools to take maintain your roof. First you will need a utility knife. Utility knives can be used to cut drywall, trim asphalt roof shingles, and slice through fiberglass insulation. Utility knives are relatively safe to use since the razor-sharp blade can be retracted. Besides a utility knife make sure you buy a roofing hammer with a straight claw. To cut wood, shingles or roofing panels, a circular saw would be the best tool. A circular saw is an electrically-powered tool can cut roof panels and plywood sheathing into various different sizes. To hammer nails in, abandon the manual hammer and opt for a nail gun. Compressed air is used to force the nails from the loaded gun strip unto the sheathing or shingles. Roof replacement contractors Ballwin