A 12 kW array is planned for the roof of a community center covered three years ago with a 60-mil TPO membrane at 2/12 pitch. The remaining single-ply warranty requires that every penetration be made and sealed by a factory-authorized applicator, and the structural review finds insufficient capacity for a ballasted system. Which mounting attachment plan keeps the roof warranty in force once the array runs?

The plan that keeps the warranty in force assigns both making and flashing every roof penetration to the factory-authorized applicator, as the warranty requires. This allows the array to be attached to the roof without relying on ballast, which the structural review finds the roof cannot support. Having the roofer make each mount penetration but leaving the PV installer to apply the flashing does not meet the requirement: the authorized applicator must perform both parts of the work. Having the PV crew drill the attachment holes and the roofer flash them also fails, because later flashing by the roofer does not make the roofer the person who created each penetration. Having the roofer install and flash the mounts but leaving the electrician to make and seal the conduit entry fails for the same reason: the conduit entry is also a roof penetration, and the warranty requires the authorized applicator to make and seal every one. An exam caveat is that “factory-authorized applicator” means the qualification specified by the warranty; general roofing experience or approved materials alone do not establish it. In practice, check the warranty’s exact scope and obtain the manufacturer’s written approval for the attachment and flashing details before work begins. Document who makes and seals every roof opening, including conduit entries.