How Often Should You Clean Your Roof in Vancouver, WA?

Most homes in Clark County need a roof cleaning once a year. Shaded roofs and homes with a history of moss may need it more often. A roof in full sun with no trees nearby can sometimes go longer. Here is how to figure out where your house lands.

Why once a year is the baseline here

Vancouver gets around 40 inches of rain a year, and most of it falls between October and May. That is seven or eight months where your roof rarely dries out. Add fir needles, maple leaves, and shade from a tall tree line, and moss and algae have everything they need.

A roof that is cleaned every year never gets the chance to build up a thick layer. That makes each treatment lighter, cheaper, and easier on the shingles than a heavy cleaning after three years of neglect.

Where your roof falls on the schedule

• Twice a yearHomes with heavy tree cover, a north-facing slope, or a history of moss. If you have had roof moss removal done before, you are probably in this group.
• Every yearMost homes. Some trees, average shade, and a roof that has been cleaned before.
• Every two yearsHomes with an open lot, full sun, and a roof that has stayed clean since the last treatment.

If you are not sure, look at the roof after a rainy stretch in early spring. If you see green, it is time.

What to check between cleanings

You do not need to get on the roof. Stand across the street and look for green or black streaks running down the slope, fuzzy patches along the shingle edges, debris piled in the valleys, or gutters overflowing during rain. Any one of those means the roof is holding moisture. For what moss actually does once it takes hold, see moss on your roof in Vancouver.

What regular cleaning prevents

Moss lifts shingle edges and lets water underneath. Debris in the valleys dams up water and pushes it sideways under the shingles instead of down into the gutters. Clogged gutters make both worse. Regular gutter cleaning is part of keeping the roof dry, not a separate job.

Together those are how a roof that should last 25 years ends up needing repair at 15.

When to schedule it

Late summer through fall is the best window for most Vancouver homes. The roof gets treated before the wet season starts, and moss that was going to grow over the winter never gets the chance. Spring works too if you already see moss. We cover the timing in more detail in the best time of year to clean your roof.

How a professional roof cleaning is done

We use soft washing on every roof. That means low pressure and a cleaning solution that kills the moss and algae at the root, instead of blasting it off with a pressure washer.

After the treatment, the moss dies and sheds on its own over the following months. The roof keeps getting cleaner after we leave.

Our roof cleaning is backed by our 12-month warranty.