See also: Metal roofs are no problem for solar installations

This installation tip is provided by SunModo

With PV installations increasing across the country, more unique roofing materials are questioned every day. For interlocking metal shingle roofs, finding the right mounting solution can be a puzzle. Most interlocking metal shingles have a pattern stamped onto them, and traditional roof mounts often require smooth, flat surfaces. Flashing is also difficult on interlocking metal shingles since shingles can’t be separated and flashing can’t slip underneath.

One way to mount solar to interlocking metal shingles is to drill a hole through the shingle and fasten a mount to the underlying sheathing and rafter. With SunModo’s EZ Metal Roof Mount, a rubber boot is then fastened to the interlocking metal shingle using small sheet metal screws and sealant to ensure a water-tight seal.

A layout of the desired mounting grid for the PV system should be laid out on the roof in the same manner as if on a composite-shingle roof. Attention should be paid to the rafter locations such that the mounts can be fastened into the rafters of the roof. This task is made more difficult with metal shingles since a stud finder will not work through the metal shingles. Careful measurements and possibly attic inspection of the roof structure may be required to accurately locate the rafters.

A 3-in. hole saw should be used to penetrate the metal roof single, and care should be taken to make a clean hole. Once the mount is secured to the rafter, the rubber boot is secured with sealant and screws.