Planning
Replacing a roof that has solar panels
The panels come off, the roof is replaced and the panels go back on. Most of the work is coordinating two trades and reading the solar paperwork.
The sequence
- The solar installer shuts the system down, takes the panels and racking off and stores them.
- The roofer tears off and replaces the roof, with new flashing planned for each racking mount.
- The solar installer reinstalls and seals the mounts and panels and reconnects the system.
A few companies do both jobs, but most homeowners end up with two contractors. Get both to agree on dates before the old roof comes off, and make sure each one is registered with the Contractors' Registration and Licensing Board; see checking a roofer.
Owned or leased makes a difference
If you own the system, you choose who handles removal and reinstallation, although the original installation paperwork may say who is allowed to work on it.
If you lease or have a power purchase agreement, the panels belong to the solar company. Agreements usually require advance notice and say only the company or its approved installer may move them. Call them before you schedule the roofer.
Timing
Solar panels are expected to stay up for decades, longer than many asphalt roofs. If the roof under a planned array is more than about 15 years old, replacing it first usually makes sense. The roof lifespan guide gives the ranges by material.
If an existing roof is leaking under the panels, do not let it wait. Leaks under an array are hard to trace and can run for months. Near the coast, ask about corrosion-resistant fasteners for both the roof and the racking; see roofing for wind and salt air.
Permits
A roof replacement and the solar reinstallation may each have their own permit requirements under Rhode Island's building code and your town's building office. The roof permits guide explains who usually pulls them.
Solar panels on a roof that is wearing out? Call to talk with a local roofer about the timing.
Mon–Fri 8:30 am–7 pm · Sat 9 am–4 pm (Eastern)
Common questions
+Can the roofer take the panels off?
Some roofers do, but many solar contracts and leases say only the system owner or an approved installer may remove and reinstall the panels. Read your agreement first.
+How long will the system be off?
It depends on the roof and on scheduling two trades. Ask both contractors for dates in writing, since the system produces nothing while it is down.
+Should I replace my roof before adding solar?
If the roof has less life left than the panels are expected to run, replacing it first usually avoids taking the panels off and putting them back a few years later.