Solar Panels and a Plano Roof: Which Job Goes First?

A solar quote and a roof quote arrive from different companies, in different formats, usually months apart, and nobody in either conversation is paid to raise the other one. So a Plano homeowner with a fifteen-year-old roof signs for twenty-odd panels, and the question of what happens underneath them gets postponed by about a decade.

That decade is the whole problem. Panels are designed to sit undisturbed for a very long time. Asphalt shingles in Collin County are not. When the two timelines are out of step, somebody pays to take the array down and put it back, and that somebody is you.

Why Does the Roof Come Up in a Solar Conversation at All?

Because the array is a long-term fixture bolted to a short-term surface. The U.S. Department of Energy's step-by-step guide for consumers going solar puts the roof near the top of the homework list, telling readers to make sure your roof can support solar panels and to be familiar with individual circumstances like the age of your roof. It also suggests a practical route when nobody remembers: it can help to know when your roof was installed or replaced, and a local building permit record will often tell you if the previous owners cannot.

The same guide gives the conclusion in a parenthesis most readers skim past: it can often save you money if you install solar at the same time as a roof replacement. That is a federal energy agency, not a roofing company, saying the sequencing matters to your wallet.

What Happens If You Put Panels on a Roof With Eight Years Left?

Nothing, for eight years. Then the roof needs replacing and the array is in the way. The panels have to come off, be stored, and go back on after the tear-off, which is a second mobilization for a second trade on top of the roofing bill. Nobody quotes that number at the start because at the start it is not due.

There is a warranty dimension too, and it is worth reading before the panels are ordered. Owens Corning's Preferred Solar PROtect Limited Warranty excludes damage caused by solar panels or associated structural or electrical parts, and separately excludes removal or damage caused by removal of solar brackets for aesthetic reasons. The shingle maker is drawing a clean line around what the array does to the roof, which means the array's installer is the one standing on the other side of it.

Four checks decide the sequencing on a particular house:

• The age of the current roof, and whether anyone has documentation rather than a guess.
• Whether the roof has already taken hail damage that has not been claimed or repaired.
• The condition of the decking, flashing and penetrations the mounts will sit among.
• Whether the slopes the panels want are also the slopes the roof is struggling on.

How Close Together Do the Two Jobs Need to Be?

Closer than most people expect, if you want the combined coverage. The Owens Corning solar warranty sets an explicit window: the solar system must be installed within 60 days of the roofing system installation. It also requires the roofing system to be installed over a clean roof deck per the manufacturer's requirements, and states that repairs must be made to any damaged areas, such as loose or cracked mortar on chimneys or rotten wood decking, before that applies.

The hardware is specified as well. New metal flashings and drip edge must be installed, with counterflashing required where applicable, and solar panel mounts must be one of the specific mounts named in the program. None of that is unusual engineering. It is simply a reminder that a roof-plus-solar job is a single assembly with one set of rules, rather than two jobs that happen to share a surface.

If your roof has more than about ten good years left, solar first is defensible. If it has fewer, doing both inside the same window is almost always cheaper than doing them in the right order years apart.

Who Is Responsible for the Holes in the Roof?

Every mount is a penetration, and penetrations are where roofs leak. This is the question to settle in writing before anyone drills. The Owens Corning document notes plainly that during the solar mount install, the thermal seal may be broken, which is a manufacturer acknowledging that the act of mounting disturbs the shingle system it warrants.

In practice the answer is usually that the solar installer warrants the penetrations and the roofer warrants the roof, with a seam between the two that nobody wants to own. Doing both jobs in one window, with the flashing and mounts set as the roof goes on, closes that seam. If the jobs are separated, ask each contractor in plain terms which of them you call about a leak near a mount, and get the answer on paper rather than in conversation.

What Does the Permit Side Look Like Around Plano?

Rooftop solar is a permitted electrical and structural job, and requirements are set city by city rather than statewide. A nearby Collin County example gives the shape of it: the City of Anna's solar panel requirements ask for a site plan showing the proposed location of the panels, manufacturer sheets for the modules, inverter and racking system including the method of attachment, and one-line or three-line diagrams. The work must comply with the requirements of the National Electrical Code and International Residential Code, and must be performed by a licensed electrical contractor registered with the city.

The inspection sequence is the part that affects scheduling. Anna's requirements state that inspections will be required prior to and upon completion of work, and that a rough electric inspection shall be performed prior to installing panels on roofs. The checklist also asks what the roof covering and framing are, which is the city asking the same question this article is. Check Plano's own requirements rather than assuming a neighboring city's apply, and give whichever contractor is pulling the permit the information they need early, because the DOE guide warns that permits and inspections can take weeks to months even where the installation itself takes days.

Solar and Roof Questions Plano Homeowners Ask

Can panels be installed on a roof that already has hail damage?

Physically yes, and it is usually a bad idea. An unclaimed hail-damaged roof is a roof with a shortened remaining life and a possible insurance claim attached to it, and putting an array over both complicates each. Settle the damage question first, because an inspection that happens before the panels go on is a great deal simpler than one that happens afterwards.

Do solar panels protect the shingles underneath them?

They shade them, which slows heat aging on the covered area, and that is a genuine if modest benefit in a Texas summer. They do not stop hail hitting the slopes around them, they add penetrations, and they put the covered shingles out of reach for inspection. Treat shading as a side effect rather than a reason.

Should I replace the whole roof or just the slopes taking panels?

Usually the whole roof, for two unglamorous reasons. Partial replacement leaves you with two roofs of different ages and a visible color difference between planes, and it tends not to satisfy the clean-deck and new-flashing conditions a combined warranty expects. Where only one slope is involved and the rest of the roof is genuinely young, it can be worth pricing both ways.

How do I find out how old my roof actually is?

Start with the permit record, as the DOE guide suggests, since a re-roof in a Texas city normally leaves one. Failing that, the roof itself tells you: granule cover, sealing, the condition of pipe boots and the state of the decking read together give a reliable age estimate. A free roof inspection will produce that in writing, which is also the document a solar installer will want to see.