Roofs in the Valley do not last forever, and solar arrays outlive them. Sooner or later a lot of Phoenix homeowners face the same project: the roof under twenty odd panels needs replacing, and the panels have to come off first.
It is a manageable job. It is also one where poor coordination between the roofer and the solar crew creates most of the problems, so knowing the sequence in advance puts you in a much better position.
Why Roofers Will Not Touch the Panels
The first thing most homeowners discover is that their roofing contractor will not remove the array. That is not laziness. It is the correct answer.
Solar arrays carry live DC voltage. Even with the inverter off and the AC breaker open, the modules generate voltage whenever sunlight hits them. Disconnecting them safely requires understanding the string topology and the rapid shutdown equipment. Beyond the electrical side, handling modules without cracking cells, tracking hardware, and reinstalling to manufacturer torque specs is its own skill set, and doing it wrong can void module and workmanship warranties.
So you are hiring two trades. Plan for that.
The Sequence
Before Anything Starts
- Call your original installer first. Many have a removal and reinstall service, and using them preserves any workmanship warranty that would otherwise be voided by third party work.
- Get the roofer and the solar company talking directly. You do not want to be the message relay between two crews on a schedule.
- Confirm who is responsible for the roof penetrations on reinstall. This is the single most important question in the whole project.
- Ask where panels will be stored and how. Flat, elevated, covered, and secure. Not leaning against a block wall for a week.
Removal Day
The solar crew shuts down the system, disconnects and labels the strings, removes modules, and then removes the racking and mounting feet. Labeling matters more than it sounds. A properly labeled removal reinstalls fast. An unlabeled one turns into detective work billed by the hour.
The array typically comes off in a single day for a residential system. Conduit and the inverter usually stay in place unless they are in the roofer's way.
The Roof Work
With the roof clear, the roofer works normally. This is the moment to look at the deck under where the array sat, because it is the only time anyone will see it. Ask specifically about moisture damage around the old mount penetrations, since that is where leaks hide, and about the condition of the sheathing.
Reinstall
The solar crew returns, sets new mounting hardware, and this is the part worth being firm about: new flashing and new sealant at every penetration, not reused hardware. Mounting feet and flashings are inexpensive. A leak under a reinstalled array is not, and finding it later means partially disassembling the array again.
Racking goes back, modules go back with fresh labeling checked against the removal labels, connections are made, and the system is energized and tested string by string. Confirm every panel reports in your monitoring app before the crew leaves. That is your acceptance test.
Cost Drivers and Timing
What moves the number:
- Panel count. The primary driver, since most of the cost is labor per module.
- Roof complexity. Multiple planes, steep pitch, and difficult access all add time.
- Storage duration. A tight schedule between removal and reinstall costs less than a two week gap.
- Whether critters got there first. If a crew opens up the array and finds an established rodent or pigeon midden, that becomes an additional cleanup with its own safety precautions.
Two Things to Do the Moment It Is Back Up
Clean the panels. Modules that spent a week or two on the ground next to a roofing job are covered in roofing dust, asphalt granules, sealant residue, and handprints. None of that rinses off in rain. Starting your new roof era with a dirty array means your post project production numbers will look worse than they should, which makes it impossible to tell whether the reinstall went well.
Install bird proofing while the array is fresh. This is the single best window you will ever get. The space under the panels is empty and accessible, nothing is nesting there yet, and the crew is already set up. Retrofitting exclusion later costs more and requires clearing out whatever moved in first.
Two Bits Solar Cleaning does exactly this handoff for Phoenix area homeowners: a full deionized water wash after reinstall so no construction residue or mineral film is left on the glass, plus perimeter bird proofing installed while the roof is still clean. Got a re-roof coming up? Talk to us about scheduling the cleaning on the back end of it.