With using the 20g corrugated metal roofing, an expected but unusual issue arose.  Finished roofs need a smooth surface upon which to be laid and the metal was corrugated.  A few years back we were introduced to the Dens Deck material by GP.  To create a flat surface for the underlayment, GP Dens Glass, a fiberglass gypsum product, was fastened to the decking.  An added benefit of the Dens Glass was the creation of a sound barrier between the metal roofing and metal rafters. That together with the spray insulation on the underside of the decking resulted in a very quiet interior. When it rains you can’t hear the pitter patter on the metal roof.

We found two underlayment products that passed our testing process and selected Majvest 500 as it was locally available. All products were inert and not mold concerns. The final finished roof was snap lock standing seam manufactured by Everlasting Roofing, a local roofing company.  The use of snap lock standing seam covers the fasteners for a more finished and elegant look with the added long-term benefit of a reduction of possible rain penetration at each fastener location. We accepted the installers recommendation to use striated 16” panels which help reduce the panel buckling from excessive heat, a definite consideration if you are building in high heat location. Metal facia trim and soffit boxing were provided by Quality Edge. As the aluminum soffit was being affixed to metal, we applied Tyvek tape to the side of the boxing channel that came into contact with the steel rafter to prevent the breakdown of incompatible metals.