On A Metal Roof

On A Metal Roof

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There are two kinds of common metal roof options for installing solar modules: corrugated metal roofs that are sometimes called galvalume, and standing seam metal roofs.

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There are two kinds of common metal roof options for installing solar modules: corrugated metal roofs that are sometimes called galvalume, and standing seam metal roofs.

With corrugated metal roofs, installation involves using lag screws to connect rails to the roof by penetrating into the rafters. This is very similar to installation on a shingle roof, and special flashing kits and washers are used with generous amounts of roofing compound to keep things watertight. A galvalume-style roof usually has shallow and continuous ridges and lots of screws to hold it down.

With standing seam metal roofs, we provide special clamps made by S-5 that squeeze onto the seams with a lip that extends under the lip of the seam closest to the roof surface. This is a non-penetrating option and it is a quicker installation. Rails kits are mounted onto the S-5 clamps and modules and other pieces of equipment are then attached to the rails.  A high-quality standing seam product called Prolok is made in British Columbia by Westform Metals for this application. We recommend the Prolok 12” in 24 gauge for roof mounted solar. This metal roof is also excellent for rainwater capture.