Cutting roof sheet with wire - GIF

[ductape]

I figured for sure if you ran a carbide tipped blade backwards it would just shatter the carbides or rip them off of the brazing. With most carbide cutters if you keep them in compression they'll last ages, but the second they go into tension they just bust to pieces. Well that's just super interesting. I may try that some day. Thank you.

As hemmjo said above, it works pretty well with carbide-tipped blades that are damaged and no longer useful for normal cutting. There isn't much of an issue with teeth shattering or breaking loose, but it does happen occasionally. A reversed blade cutting through the bottom of the sheet kind of deflects the debris. Wear your safety sandals and put all your thumbs up. It's also loud as all heck, but fast.