Does the system’s Class-A fire rating still apply after third-party penetrations or skylight replacements—what combination of underlayment/flashings is required to keep the assembly listing valid?
So, your Tesla Solar Roof is made to be super safe from fires and has this cool UL certification. But, here’s the thing: if you want to put in skylights or vents, you gotta make sure the person doing it uses the right parts and knows the right way to install them to keep that fire safety rating. If they don’t get it perfect, the whole roof loses its Class A fire rating. Usually, the inspectors check everything with photos and paperwork to be sure it’s all good before they give it the thumbs up.
Maintaining a Class-A fire rating for your roofing system after third-party penetrations or skylight replacements requires careful consideration of materials and installation methods.
Installation and Flashing Requirements;Proper Flashing, Sealants and Sealers, Underlayment and Flashing Combination
The Class-A fire rating only remains valid if any penetrations or skylight replacements are detailed exactly per the manufacturer’s tested assembly and UL/ICC listing. This usually means using the specified Class-A–rated underlayment beneath and around the opening, plus compatible fire-rated flashings approved by the system manufacturer.
Deviations like unlisted sealants, different flashing metals, or non-rated skylights can void the fire classification, so verify with the manufacturer’s installation manual and listing agency before work.