--- title: How to cut the 12 ft. SM-Rib Galvalume Steel 29-Gauge Roof/Siding Panel? description: Steel roofing and trim should be cut with nibblers, tin snips or a 7-1/4 inch metal cutting wheel on a circular saw. --- [Skip to content](https://help.gibraltarbuildingproducts.com/en/knowledge/how-to-cut-the-12-ft.-sm-rib-galvalume-steel-29-gauge-roof/siding-panel#main-content) English Show submenu for translations ![GBAD Full Color.png](https://blog.stealthbond.com/hubfs/GBAD%20Full%20Color.png) Open main navigation Close main navigation - English Show submenu for translations - Go to www.gibraltarbuildingproducts.com Go to www.gibraltarbuildingproducts.com Hello. How can we help you? - There are no suggestions because the search field is empty. 1. [Help Center](https://help.gibraltarbuildingproducts.com/en/knowledge?hsLang=en) 2. [Metal Roofing](https://help.gibraltarbuildingproducts.com/en/knowledge/metal-roofing?hsLang=en) 3. [Metal Roofing](https://help.gibraltarbuildingproducts.com/en/knowledge/metal-roofing?hsLang=en#metal-roofing) # How to cut the 12 ft. SM-Rib Galvalume Steel 29-Gauge Roof/Siding Panel? ## Steel roofing and trim should be cut with nibblers, tin snips or a 7-1/4 inch metal cutting wheel on a circular saw. Steel roofing and trim should be cut with nibblers, tin snips or a 7-1/4" metal cutting wheel on a circular saw. There are two major concerns when using a saw. First, the filings coming off the blade are hot and will adhere to the surface of the panels and these will rust. Be sure to always cut from the underneath side and make sure all filings are removed from the surface as they will rust and pit the surface of the sheet. Second, be sure that no burrs are left on the ends of the panel. The rough edges are not protected and will rust. The cut end, when possible, should always be used at the ridge. 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