Put on your gloves and your welding mask before proceeding. Place the corrugated sheet on a work surface, such as a sewing table. Make sure there are no obstructions to your saw blade, especially below the cutting line. Open the blade guard and make sure it's a sharp-toothed metal knife designed for cutting metals. You may want to go for a diamond knife as it makes a clean cut. Bend the corrugated metal with your other hand and begin cutting. Hold the metal at least two feet away from the saw, pull the trigger and make the saw's first cut. Gently guide the saw through the corrugated metal and allow the excess element to fall freely as you cut. The circular wheel cut is very suitable for cutting long lengths of straight-line corrugated metal.