Originally Posted by enggass
Yes. It is the Tuftex Panel. Not the PolyCarb one though - the next step down. Vinyl maybe?
Hm, googling does not work so well for me for that, but from a couple of mentions I *think* it is pvc. In which case before you cut into it, you would wnat to make sure you WANT it... it will get brittle once it gets down into the single digits F, should not be installed anywhere that will get especially hot e.g. over top of plywood roof decking, and basically you should not expect to get many years' use out of it or to have it withstand impacts or very high winds. It does have the advantage of cheaper-ness but for a reason Just making sure you know.
Incidentally, having opened the pdf installation guide for it in search of materials info, I notice it says "cut single panels of tuftex with a utility knife or a pair of scissors. multiple panels may be cut using a circular saw with a plywood blade reversed or a fine handsaw". To answer your original Q straight from the manufacturer's mouth http://www.westmansteel.ca/public/File/products/tuftexInstallGuide.pdf If you haven't, read the whole thing b/c it gives you specs about supports and overhang and predrilling hole sizes and so forth, if you do not install plastic roofing exactly right it tends to do unsatisfactory things during storms.
Good luck, have fun,