Roof cleaning in Beaverton, Oregon means removing the moss, algae and lichen that grow on shaded roofs through the long wet season, without damaging the shingles underneath. Call 971-385-8011 to request a quote from Gorilla Property Services.
Why moss grows so well on Beaverton roofs
Moss needs shade, moisture and something to hold onto. Beaverton supplies all three. Rain falls on and off from fall through spring, mature firs and maples keep many roofs shaded, and the gritty surface of an asphalt shingle gives spores a place to settle. North-facing slopes and the sections under overhanging branches usually turn green first.
Moss is more than a cosmetic problem. A moss cushion holds water against the roof for weeks at a time. As it grows, it pushes up under the lower edge of each shingle, which lets wind-driven rain reach the layers beneath. Clumps that break off in storms wash into the gutters and block them.
Moss, algae and lichen are not the same
- Moss forms green, spongy mounds that lift shingle edges and hold water.
- Algae shows up as dark streaks running down the roof. It looks bad but sits on the surface.
- Lichen appears as flat, crusty patches, often pale green or gray, that grip the shingle tightly.
Most Beaverton roofs we see have some mix of the three, and the cleaning approach handles all of them together.
How we clean a roof
We use a soft wash: a cleaning solution applied at low pressure that kills moss, algae and lichen down to the root. Loose moss is cleared by hand first, then the solution goes on and is given time to work before the growth is rinsed or brushed away.
We do not pressure wash shingle roofs. A pressure washer can make a roof look clean for a day, but it strips the mineral granules that protect asphalt shingles from sunlight, and it can drive water up under the shingle edges. Losing granules shortens the life of the roof.
Pair it with gutter cleaning
Moss and debris that come off the roof end up in the gutters. Booking gutter cleaning on the same visit means the gutters are clear once the roof is done.
When to schedule roof cleaning
Moss is easiest to treat while it is actively growing, which in Beaverton is from fall through spring. Treatment works most effectively in a dry spell of a day or two, so the solution is not diluted by rain before it can work. Many homeowners book roof cleaning in early spring or early fall and pair it with gutter cleaning.
| What you see | What it usually means |
|---|---|
| Green mounds along shingle edges | Active moss that is lifting the shingles |
| Black streaks down the slope | Algae on the surface |
| Crusty pale patches | Lichen gripping the shingle |
| Granules piling up in the gutters | Shingle wear, often made worse by moss or past pressure washing |
Is your roof ready for cleaning?
If you can see green on the roof from the street, it is time. Other signs include gutters that refill with moss soon after cleaning, shingle edges that curl upward and dark streaks on the shaded side of the house. Removing moss before it gets thick is easier on the roof than waiting until it has lifted the shingles.
Request a roof cleaning quote
Tell us about the size and pitch of the roof, how much of it is shaded and what you can see growing on it, and we will get back to you with a quote. Call 971-385-8011 or use the form on this page.
