A homeowner I consulted with had a leased solar system installed under a twenty year agreement, the kind where the company technically owns the panels sitting on your roof. When water started coming through his attic ceiling, he traced it back through the insulation to a mounting point under one of the panels. He called the solar company expecting them to send someone out. Instead they told him to find a roofing contractor himself, get that contractor to write a statement confirming the leak was related to the panel, and only then would they consider next steps. Every roofer he called said no. None of them were licensed to touch the electrical system sitting on top of the leak, and none wanted the liability of working around equipment they did not own and could not disconnect.

He was stuck between two trades, each one correctly saying the job belonged to the other, while the leak kept getting worse every time it rained.

Where Roof Leaks After Solar Actually Come From

The Roof Material Was Never Meant For This

Mounting a solar array almost always means drilling into the rafters and sealing each of those penetrations individually. Asphalt shingle roofs tolerate this reasonably well when the work is done right. Wood shingle, slate, clay, and terracotta roofs are a different story, since those materials are far more prone to cracking or failing to reseal properly around a mounting point. When a roof uses one of those materials, it is common practice to strip the section under the array down to composite shingle first, since that section will be hidden under the panels anyway and composite tolerates the mounting hardware far better.

The Roof Was Already Near The End Of Its Life

Solar panels are built to last 25 to 30 years. Most roofing materials are not. Installing a new array on a roof that already has dry rot or soft spots hidden under the shingles adds real stress to a structure that was already failing, and once that failure shows up as a leak, fixing it means removing the entire array and its electrical conduit first, not just patching a section of roof. The rule of thumb worth following is to have at least 20 years of remaining roof life before adding a system meant to sit there for 25 or more. If replacing the roof is anywhere on the horizon, doing it before the solar installation, not after, avoids paying to remove and reinstall an entire array just to replace the shingles underneath it.

Who Actually Owns The Leak Once Panels Are Up

The homeowner I mentioned earlier was not dealing with a defective panel. He was dealing with a gap between two contracts. His agreement guaranteed roof penetrations for exactly one year, well short of the system's operating life, and after that window closed, responsibility for anything related to the mounting hardware became genuinely unclear. Homeowners insurance often does not help either, since many standard policies specifically exclude solar equipment and the damage connected to it. The practical fix is choosing an installer who either does roofing work directly or has an established, named roofing partner before signing anything, rather than discovering after a leak shows up that two companies each believe the repair belongs to the other one.

What Happens Under The Panels You Cannot See

Nesting And Debris

The gap between a mounted panel and the roof deck makes an attractive, sheltered nesting spot for birds and small animals. Left unguarded, that space collects nest debris that can clog drainage paths and hold moisture against the roof surface, and animals chewing through wiring underneath the array is a real and documented fire risk, not a theoretical one. Mesh guards installed around the perimeter of the array during installation close off that space before anything moves in, and they are far cheaper to install upfront than to retrofit after finding a nest.

Weight And What The Structure Actually Needs To Support

An array adds real, distributed weight to a roof that was not necessarily designed with that load in mind. A structural assessment before installation, not after, is what catches whether the existing framing can carry it without sagging over time. This is also where the choice to upgrade to composite shingle under the array earns its cost twice over, once for mounting durability and once for handling the added weight better than aging asphalt.

The Upside Nobody Mentions

None of this means solar is a net negative for a roof. Panels installed correctly actually shade the shingles beneath them from direct sun, which reduces the UV exposure and heat cycling that age asphalt roofing in the first place, and the same shading effect can measurably lower attic temperatures underneath the array. A roof that would otherwise take the full brunt of a hot climate for decades gets a partial break under a well installed system. The tradeoff only turns negative when the roof underneath was not ready for the array in the first place, or when nobody thought through who is responsible for what once the warranty clock runs out.

Where This Leaves Me

I tell every client considering solar the same thing I wish someone had told the homeowner with the leak. The panels themselves are rarely the problem. The roof underneath them, and the contract governing who fixes what once something goes wrong, are where the real risk sits.

What I walk through before anyone signs a solar contract now: