West of the Cascades, moss is not a cosmetic problem. It holds water against the shingle, lifts the edges, and works its way under the course above until the roof leaks. We remove it without pressure-washing the granules off — a pressure washer takes the moss and the remaining life of the roof with it — and treat what is left so it stays gone.
How It Works
Look at the growth
Moss, algae streaking and lichen all come off differently, and how far in it has got decides the method.
Remove it by hand
Brushed and scraped off, never blasted. A pressure washer strips the granules and shortens the roof's life.
Treat what's left
Treatment kills the roots left in the shingle mat, which is what stops it growing straight back through the winter.
Clear the run-off
All of it ends up in the gutters, so the gutters and downspouts get flushed before we call the job done.