#11  
Old 12-09-2012, 08:15 PM
Peasant
 
Join Date: Oct 2012
Location: Minnesota
Posts: 43
Default Re: Cutting METAL roof.

You are inviting rust if your final cut is not a shearing cut, i.e. tin snips, electric shear or guillotine. A shearing cut will pull enough zinc (galvainization) over the edge to protect the raw steel. If you use a saw or grinder for your rough cut cover your steel sheet to protect it from flying sparks. The hot steel will imbed in the paint and show up later as rust spots. If you rough cut within 1/2 inch its easy to make your final cut in 26 or 28ga. with a tin snips.
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