Solar panels on a flat roof: leaks, weight, tilt, and warranty

Solar panels on a flat roof can work well, but four questions have to be answered before the proposal is worth trusting: will it leak, can the roof carry it, what tilt makes sense, and what happens to the roof warranty?

Leak risk is mostly a workmanship issue. A good design avoids unnecessary penetrations, uses the right attachment and flashing method when penetrations are needed, and leaves access for future roof service.

Weight is the next issue. Ballasted systems can add meaningful load. That does not make them bad. It means the installer has to understand the roof structure before treating the system like a simple pitched-roof install.

Tilt affects production and spacing. More tilt can improve angle, but it can also create row-to-row shading and reduce how many panels fit. On some roofs, a lower tilt with more usable rows produces better total economics.

Warranty is where homeowners need plain language. If the roof is new, the solar design should protect the existing roof warranty. If the roof is old, the warranty conversation may point toward roof work first.

Flat roof solar is not a reason to avoid solar. It is a reason to avoid lazy solar. The roof review comes first.