You need a new roof before solar if your roof has roughly ten to fifteen years of life left or less. Solar panels stay up for 25 years or more, so a roof that wears out first means taking the whole array down and putting it back. Sunbridge Solar checks roof age and condition in every free consultation in Oregon and Washington.
Why does roof age matter so much for solar?
Roof age matters for solar because the panels and the roof underneath need to last about the same length of time. The panels Sunbridge Solar installs carry 25-year product warranties and keep producing well beyond that, so the roof under them should have a similar runway.
If an aging roof starts leaking a few years after installation, a solar crew has to come out, shut the system down, remove every panel and rail, and store them while the roofers work. Then the crew comes back to reinstall and recommission the system. In the industry this is called a remove and reinstall. You pay for it on top of the roof, and the system makes no power while it is off the roof. Doing the roof first avoids all of that.
How do you tell if your roof needs replacing before solar?
You can tell a roof needs replacing before solar from its age, its material and a few visible warning signs. A professional assessment is the only way to know for sure, but this is what we look at in the Pacific Northwest.
Roof age
- Under 10 years old: usually ready for solar, with plenty of life left.
- 10 to 15 years old: a gray area. Depending on material and condition, it can make sense to replace the roof before or alongside the solar install.
- Over 15 years old: composition shingle roofs in Oregon and Washington typically last 20 to 25 years, so at this age we usually recommend replacing the roof first.
Warning signs on the roof
- Granule loss: gutters full of sand-like grit mean the shingles are shedding their protective layer.
- Curling or cupping: shingles lifting at the edges let wind-driven rain underneath.
- Heavy moss: common here, but thick moss can lift shingles and hold moisture against the deck.
- Soft spots: a spongy feel underfoot points to rotting sheathing.
Structure
Solar adds weight, and our region adds wind and snow loads on top of it. Sunbridge Solar checks that your rafters and trusses can carry the array. Older homes sometimes need minor reinforcement, such as added collar ties or sistered rafters. Our post on the engineering behind a solar array explains what we look at.
Which roof materials work best for solar?
Composition shingle and standing seam metal roofs work best for solar, tile roofs work with special mounts, and cedar shake usually needs re-roofing first. Each material changes how the array is attached and sealed.
- Composition (asphalt) shingles: the most common roof in the Pacific Northwest and straightforward for solar, using flashings that slide under the shingles to seal each attachment.
- Standing seam metal: often the best surface for solar. Clamps can attach to the seams without drilling through the roof, and the roof’s lifespan matches the panels.
- Tile: possible with tile replacement mounts, but tiles are fragile and need more care.
- Cedar shake: generally not a good match for solar because of fire codes and how the material ages. We usually recommend re-roofing the solar area with composition shingles first.
- Flat roofs: workable with ballasted or bonded mounts, as long as drainage is good so water does not pond around the mounts.
For the rest of the picture, including which way your roof faces and how much shade it gets, see our guide to whether your roof is right for solar.
Should you replace the roof and install solar at the same time?
Replacing the roof and installing solar back to back is usually the smartest order, because the two crews can coordinate. Some installers call this a solar rough-in.
- The roofer strips the old roof.
- The solar team installs the flashings and attachments directly to the roof deck.
- The roofer shingles around and over the flashings.
The flashings end up built into the roofing system rather than added on top, which helps waterproofing. It also cuts down on finger-pointing between roofer and installer if a leak ever appears, and roof vents can often be moved to leave a cleaner area for panels. Sunbridge Solar regularly works alongside local roofers to schedule it this way.
Can you re-roof just the section under the panels?
You can re-roof just the section under the panels, but it has trade-offs. This approach, sometimes called an insert roof, saves money up front. The downside is two ages of roofing on one house: when the rest of the roof wears out, the patch may not match, and roofers have to tie new shingles in around the array. We generally recommend a full replacement, but we will talk through a partial one if your layout suits it.
Can you claim a tax credit on a new roof for solar?
You cannot claim a federal tax credit on a new roof for solar in 2026. The IRS states that the residential clean energy credit is not available for property placed in service after December 31, 2025, so there is no federal homeowner credit on the roof or the panels for new installs.
Even while that credit existed, a standard roof was generally treated as part of the house rather than as solar equipment. If an older article or quote still subtracts a credit for your roof, it is out of date. See our federal solar tax credit update for the details, and talk to a tax professional about your own situation.
Will solar void your roof warranty?
Solar does not usually void the warranty on your whole roof, though a roofing manufacturer may exclude the attachment points themselves. Sunbridge Solar covers its own roof attachments with a 10-year craft warranty. If your roof is new, check with your roofer before installation; many are happy to work with us so your coverage stays in place.
Does solar protect the roof underneath it?
Solar panels shade and shelter the roof underneath them, which can slow its wear. The panels take the direct sun and much of the rain that would otherwise hit those shingles, and the air gap behind them keeps the roof surface cooler in summer. That does not replace a sound roof to start with, but it means the section under the array is often the best-preserved part of the roof.
New roof before solar FAQ
How old is too old for a roof before solar?
A roof older than about 15 years is usually too old for solar in Oregon and Washington, because composition shingles here typically last 20 to 25 years. Roofs between 10 and 15 years old are a judgment call based on condition, and Sunbridge Solar checks this during the free consultation.
Does Sunbridge Solar replace roofs?
Sunbridge Solar installs solar and battery systems rather than roofs. It assesses your roof during the free consultation and regularly works alongside local roofers, so a roof replacement and solar installation can be scheduled together.
What happens if my roof needs replacing after solar is installed?
If your roof needs replacing after solar is installed, the panels and racking have to be removed, stored and reinstalled around the roof work. That is an extra cost and time without solar production, which is why Sunbridge Solar recommends dealing with an aging roof first.
Can solar go on a cedar shake roof?
Solar is generally not a good match for a cedar shake roof because of fire codes and how the material ages. Sunbridge Solar usually recommends re-roofing the solar area with composition shingles before installation.
Is a new roof covered by a solar tax credit?
A new roof is not covered by a federal solar tax credit. The federal residential clean energy credit is not available for property placed in service after December 31, 2025, and a standard roof was generally not treated as solar equipment even before then. Talk to a tax professional about your situation.
Get an honest roof and solar assessment
If your roof is in bad shape, we will tell you, and we would rather wait for a new roof than install a system we expect to take down in a few years. Call 360-313-7190 for a free consultation, or request a free solar quote online.
