sold by thereclaimednation. cool panel design metal roofing panel lengths with 2560×1920 px. cut out around the knobs \u2013 if you have knobs in the wall of your shower, you\u0027ll need to trim the roofing panels to accommodate them. 20140112-192007jpg. copper penny 7/8\” corrugated . caulk! \u2013 finally, you\u0027ll want to caulk all the seams and corners we ran large seams of clear silicone caulk in all of the inside corners and where panels . corrugated metal roof panels noblesville.