Steel (painted or not) will have a protective coating of pure zinc (galvanized) or aluminum/zinc alloy (Galvalume or Zincalume) for corrosion protection. SSMR is most often carbon steel, aluminum, zinc, and very rarely copper or stainless. Metallurgy is important when materials will be in electrolytic contact. The result is a marriage that is maintenance-free for the service lives of both PV system and roof, while saving about 15 percent of total system cost when compared to other roof types and mounting methods. SSMR is subjected to the most demanding wind tests in the construction industry (ASTM E1592, UL 580, and FM4471) but tributary loads must be uniformly distributed from PV to the SSMR.
#Metal roof attachment solar mounting code#
Of concern to building owners, roof manufacturers, PV integrators, and code authorities is that the integrity of the roof system is maintained, and attendant warranties are not jeopardized. The SSMR industry has used this technology since it was invented by S-5! in 1992, and SSMR manufacturers recommend this method when making attachments to their roofs. When proper clamps are used, this establishes a secure mechanical interlock.
The clamps grab the roof seam by pinching it with non-penetrative, round point set-screws. The seams of SSMR are beam-like elements that provide convenient attachment points for the PV. Standing seam metal roofing (SSMR) is the most convenient of any roof type for mounting PV modules.
What are the best design and installation practices when using seam clamps to structurally attach PV systems to standing seam metal roofs? Best Practices for Solar Mounting on Standing Seam Metal Roofs
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