Repair Guide
Solar Roof Leak Repair — Mounting Penetration Leaks
Leaks at solar mounting feet or conduit entry points are a known failure mode, especially on older installations. Here is how to identify them and what the repair involves.
Is it a solar leak or a roofing leak?
Likely a solar penetration leak
- Water staining directly below a mounting foot location
- Leak appears only during heavy rain, not light rain
- Leak started years after installation (sealant dried out)
- Visible cracked or missing sealant at mounting hardware
Likely a roofing issue
- Leak appears in the middle of a roof section, not near panels
- Leak appears even in light rain
- Roof is 15+ years old with no recent inspection
- Multiple leak locations across the roof
Why solar penetration leaks develop
Solar mounting hardware uses lag bolts or standoffs that penetrate the roof sheathing. Properly installed, these are sealed with flashing and butyl tape or roofing sealant. The seal is weathertight when new.
In Fresno, summer temperatures regularly reach 105–115°F. That heat cycles daily — expanding and contracting the sealant, the metal hardware, and the roof material at different rates. Over 8–12 years, this thermal cycling dries out and cracks the sealant, creating a path for water.
Installations that used inadequate sealant or skipped flashing steps may develop leaks sooner. We see this most often on systems installed during the 2010–2015 solar boom, when some installers cut corners on weatherproofing.
How we repair a solar roof leak
Locate the penetration
We identify which mounting foot or conduit entry point is the leak source. This usually requires attic access to trace the water path.
Remove affected panels
We remove only the panels directly above the leaking penetration — typically 2–4 panels, not the entire array.
Remove and inspect hardware
We remove the mounting hardware, inspect the roof sheathing for water damage, and assess whether the sheathing needs repair.
Reseal and reinstall
We install new flashing, apply fresh butyl tape and roofing sealant, reinstall the hardware, and replace the panels.
Verify and document
We photograph the completed repair and verify the system is producing normally before leaving.
Frequently asked questions
How do I know if my solar panels are causing a roof leak?
Solar-related leaks typically appear directly below a mounting foot or conduit entry point — not in the middle of a roof section. If you see water staining on the ceiling or attic framing that traces back to a point directly below a panel mounting location, a solar penetration is the likely source. Leaks that appear in the middle of a roof section between panels are more likely a roofing issue unrelated to solar.
Are solar roof leaks common?
Properly installed solar systems rarely leak. The mounting hardware uses flashed lag bolts or standoffs that are designed to be weathertight. Leaks typically occur when: (1) the original installation used inadequate flashing or sealant; (2) the sealant has dried out and cracked over time (common after 8–12 years in Fresno's heat); or (3) the roof membrane itself has failed near a penetration point.
Can you repair a solar roof leak without removing all the panels?
Usually yes. We remove only the panels and racking hardware directly above the leaking penetration, reseal the mounting point, and reinstall. In most cases, this is 2–4 panels rather than the entire array. If the leak is at a conduit entry point, we may not need to remove any panels at all.
Do you do the roofing work or just the solar work?
We handle the solar side — removing and reinstalling panels and racking, resealing solar penetrations, and repairing conduit entry points. If the leak is in the roof membrane itself (not at a solar penetration), we coordinate with a licensed roofing contractor. We do not perform general roofing work.
How much does solar roof leak repair cost?
Cost depends on the number of penetrations involved and the extent of repairs needed. We provide a written quote before any work begins.
Will my homeowners insurance cover a solar roof leak?
It depends on the cause and your policy. If the leak resulted from improper installation by a previous contractor, you may have a claim against that contractor's liability insurance. If it is normal wear (dried sealant), it is typically a maintenance item not covered by insurance. If the leak caused interior water damage, that damage may be covered under your homeowners policy. We document the leak source with photos, which can support a claim.
Related guides
Roof leak at a solar mounting point?
We locate, repair, and reseal solar penetration leaks throughout Fresno, Clovis, Madera, and the Central Valley. License #1063682.