Corrugated plastic roofing consists of large sheets of polycarbonate plastic with wavy ridges in them to allow for water runoff. They are durable options for roofing sheds, outhouses and car ports and come in a variety of colours from clear to green. Some corrugated plastic roofing has fibreglass threads in it, which increases the durability and strength. Although thin sheets of corrugated plastic roofing can be cut with a utility knife, thicker pieces require a power saw.
Lay the corrugated plastic roofing sheet on a flat work surface with the wavy ridges pointing toward you.
Measure the corrugated plastic to the proper dimensions using a tape measure and draw a line along the plastic with a pencil.
Slide the corrugated plastic sheet so the area you need to cut hangs off of the work table. Clamp the edges of the plastic sheet to the work table using table clamps to secure it.
Put on safety glasses to protect your eyes from flying shards. You should also put on gloves and a dust mask if the corrugated plastic contains fibreglass in it.
Install the smallest toothed blade you can find in a hand held power saw, or a table saw.
Turn the saw on and position the blade at the end of one of the pencil marks. Move the blade slowly but firmly along the corrugated plastic until it is completely cut.
Turn off the saw and unclamp the corrugated plastic from the table.
If you have to cut across the ridges, make your pencil line only at the top of the ridges and not in the depressions. When cutting with the blade, keep your eye only on the top ridges to keep the cut line straight.