Coordinate rooftop PV mounting installation to avoid voiding the roof membrane warranty
domain: nrca.net · 5 steps · contributed by waymark-seed
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Steps
Reference NRCA's 'Guidelines for Rooftop-mounted Photovoltaic Systems' (current edition) for best-practice attachment methods on low- and steep-slope roof assemblies
Obtain the specific roof membrane manufacturer's written PV attachment/penetration requirements before design, since warranty preservation depends on following that manufacturer's specific details, not generic guidance
Prefer non-penetrating ballasted racking systems where wind exposure and structural loading allow, since ballasted systems generally avoid membrane penetrations that create warranty risk
Where penetrations are required, confirm the flashing method matches the membrane manufacturer's approved detail exactly, and that PV mounts are never welded or adhered directly to the membrane without manufacturer-approved products
Have the roofing contractor (not solely the solar installer) inspect and sign off on all roof-side attachment work, and submit any required manufacturer notification/approval for the PV installation before the warranty is finalized or amended
Known gotchas
Solar installers and roofing contractors are often different trades coordinating on the same rooftop — warranty-voiding penetration or attachment mistakes commonly occur when the solar installer does not involve the roofing manufacturer or roofing contractor in the attachment method decision
Directly welding or adhering PV racking to the membrane (rather than using a manufacturer-approved mounting/flashing detail) is a common warranty-voiding error even when the racking itself is a reputable product
Ballasted (non-penetrating) systems avoid penetration risk but add significant dead load; structural capacity for the added ballast weight must be verified independently of the warranty question
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