What Happens to Your Solar Panels During a Reroof: A Milwaukie, OR Project

There's a solar array on this Milwaukie roof, and it's sitting on shingles that are three days old. The panels came off before tear-off, the roof was rebuilt underneath them, and they went back on once the new system was down.

That sequence is the part solar homeowners rarely hear about, and it's usually what stands between them and a roof replacement they already suspect is coming. The array doesn't have to be a permanent obstacle. It just has to come off in the right order.

Project at a Glance

Reroofing With Solar Panels Is Simpler Than It Looks

Solar tends to freeze homeowners in place. The array represents a real investment. It took a crew and a permit to install, and the instinct is to leave it alone.

The problem is that asphalt shingles don't stop aging underneath it. They reach the end of their service life on their own timeline. If that happens before anyone's willing to touch the panels, the roof keeps going and the homeowner ends up doing the work later under worse conditions, usually after a leak has already started.

Removing and resetting an array is coordinated as part of the project and it happens routinely. This one added a day. That's the whole cost of doing it in the right order.

What the Inspection Turned Up

This homeowner called for a roof inspection rather than a repair, which is the right instinct on a roof of uncertain age.

Shingles Were No Longer Sealed Down

Asphalt shingles aren't just nailed on. Each course carries a strip of adhesive that softens in the sun and bonds it to the course below, so the finished roof behaves like one bonded surface instead of a stack of loose tabs.

On this roof, that bond was gone. A shingle at the eave lifted free under one hand, no resistance, nothing holding it but the nails above it. Once shingles are lifting, wind gets underneath and works on the fasteners. That's how an aging roof sustains storm damage in the Pacific Northwest: the shingles that blow off in the next windstorm are usually the ones that stopped sealing seasons earlier.

The Attic Wasn't Breathing

The inspection included a look in the attic, and it turned up two things: ventilation that wasn't keeping up, and heavy sap buildup.

Attic airflow is the least visible part of a roof and one of the most consequential. Warm, moist air from the living space rises into the attic year-round. In a climate with as many damp months as this one, it needs a path out. Balanced intake down at the eaves and exhaust up high gives it one. Without that, moisture works on the deck from the inside while the shingles are wearing out from the outside, and the roof gets attacked from both directions at once.

The Gutters Were Full

Directly below that lifted eave course, the gutter was packed with fir needles and organic debris, with algae growth along the back edge.

Milwaukie sits in the middle of mature conifer canopy, with Douglas fir that sheds year-round rather than in one tidy autumn window. Without adequate gutter maintenance, the gutter stays full, stops draining, and holds standing water against the roof edge and the fascia, while the eave remains permanently damp throughout the wet season. 

That's the exact stretch of roof where the shingles had already let go.

Rebuilding the Roof, and the Edge It Drains Into

he array came off first, then the old shingles and underlayment came up so the deck could be inspected for rot or damage. Three sheets of plywood replacement are included in every RedBird reroof, and anything beyond that is quoted and approved before it goes on.

From there, the system went back on in sequence. Drip edge and flashings at every transition and penetration. Waterproof membrane in the valleys, where two planes drain into one channel and carry far more water than the field. Synthetic underlayment across the entire deck. Starter shingles around the full perimeter to give the first course something to bond to at the edges, which is where wind uplift begins and where this roof had already failed.

Then Malarkey Vista architectural shingles, with hip and ridge caps matched to the field color. We reviewed the existing attic ventilation and installed the correct amount of intake and outlet venting for the structure, which addressed what the attic inspection found rather than covering it up.

Why the Gutters Went On at the Same Time

The gutters were replaced as part of the same project. A new roof draining into a gutter that can't move water is a system with a known weak point built into it. Doing both at once means the edge detail gets handled properly instead of worked around. We fabricate seamless gutters on site. RedBird's offer, 50% off new gutters with a full roof replacement, usually makes the decision easy.

Three days, wrapped up on July 30. Malarkey Emerald Pro certification means every installation qualifies for enhanced manufacturer coverage backed by our 25-year labor warranty, and that coverage is transferable one time if the house ever changes hands.

Thinking About a Reroof but Worried About Your Panels?

If solar is the reason you've been putting off a roof replacement you already suspect you need, that's a solvable scheduling problem, not a reason to wait. The roof under the array is the one part of the house you can't easily look at, which is a good argument for having someone else take a closer look.

Our estimator Taylor put this project together after an inspection. That inspection included the attic, because the ventilation and moisture questions are usually the ones a homeowner can't answer alone. If your roof has years left, that's what we'll tell you.

We work throughout the Portland metro. Call us at (360) 605-3127 to get a straight read on where your roof stands. You can also request your free estimate online.