Panels Belong on a Roof With Twenty Years Left in It

Twenty five years is the warranty term stamped on most of the panels going onto Thurston County roofs this year. Anyone pricing solar panels olympia wa crews are quoting should hold that number against a second one, the age of the composition roof those mounts are about to punch through. Almost nobody does. The bid gets compared on price per watt and the deck underneath is treated as a fixed part of the house. It is not fixed. The roof under an array decides the economics of the whole install. Bolt a 25 year system onto a deck with five summers left in it and the array has to come off and go back on at the owner's expense.

Crews Keep Finding Aging Roofs Beneath New Panels

Job after job, what turns up beneath a young array is a roof that was already tired when the racking went on. Not bad luck. Rooftop solar is a first time purchase for nearly everyone who buys one, so the questions asked at the kitchen table tend to be the ones the salesperson prompts. Researchers at Ohio State reported in July 2026 that roughly 8% of American households have adopted residential solar, a share they argue could climb with better support for the decision at home. Roof age never makes that list of questions. It belongs at the top of it.

Nobody Inspects What the Mounts Screw Through

A mount is a lag bolt driven through the sheathing into a rafter, flashed and sealed, and it performs exactly as well as the wood it lands in. The solar scope of work stops at the array. There is no roofer on the job, because nobody hired one. So the first person to look hard at the deck is usually whoever gets called out after a stain shows up on a bedroom ceiling. By then the array is sitting on top of every repair. Southwest Washington also ages a roof faster than the rating on the bundle suggests. From October through March the moss holds water against the granules and shaded north slopes stay damp for weeks. A 22 year old composition roof in Thurston County is not the same animal as a 22 year old roof in Phoenix. (If you have ever cleaned one and watched the granules rinse into the gutter, you already know this.)

A Detach and Reset Is a Second Install

Detach and reset is the trade name for pulling an array off, storing it, replacing the roof underneath, then remounting and rewiring the entire system. On a single story 1990s ranch that work lands in the mid four figures, and none of it buys the homeowner anything new. Dropping a rebuilt engine into a truck with a rotted frame costs money the same way. The expensive part is fine, the thing holding it up is not, and separating the two is where the bill comes from. A detach and reset makes the owner pay for the same installation twice. None of that arithmetic is complicated, which is exactly why it gets skipped.

That line is an example scenario rather than a measurement, and the chart says so in its own title. Assume a 30 year roof, then subtract its age on the day the panels go up. A 5 year old roof leaves roughly 25 years of undisturbed service under the array, a 20 year old roof leaves 10, and a 25 year old roof leaves 5. Somewhere in the middle of that descending line the panel warranty stops being the limiting factor and the deck quietly takes over. Real roofs vary with material, slope, shade and exposure, so read the shape and not any single point. The shape is the whole lesson.

One Contractor Sequencing Both Jobs Ends the Repeat

The fix is sequencing, not a better panel. The American Solar Energy Society puts the demonstrated real-world service life of well built panels at 25 to 30 years or more, which means the hardware will usually outlast any roof that is already past its teens. So the roof goes first. When one contractor carries roofing and solar with in house crews, the deck assessment and the array design happen in the same conversation. Nobody ends up refereeing two companies over whose work caused the ceiling stain.

A quote for solar panels olympia wa homeowners can actually trust opens with the deck, not with the array. Ask for the roof's age, ask what the sheathing looks like, and ask what the plan is when those two numbers refuse to line up. A deck with 20 good years left in it carries an array through the entire warranty without anyone climbing back up there to unbolt it. Doing the jobs in that order costs less than doing the second one twice.