Here are two photos from a recent install. Corrugated metal roofing required special feet to bridge the corrugations. Also needed a little extra backing under the roof to ensure the lag bolts had enough MEAT to assure they would not pull out in 90MPH winds. Customer had 27 panels, but we could only fit 26 on the roof with two rows of portrait and one of landscape with just 12 inches space between the two sections. Much like painting yourself into a corner, we laid down panels, till the last one forced us off the roof onto a ladder… Excellent “helper” crew allowed the ENTIRE INSTALLATION to be executed in 1 day – 8AM til 6PM with 20 minutes for lunch! System used Canadian Solar CS6P-225 panels and Enphase M215 inverters. Powered up without a hitch and has been running for a couple weeks without any problems. Here’s a solar performance link for this installation if you’re interested! https://enlighten.enphaseenergy.com/public/systems/kEHV51259