Two Pierce County problems with one cause: 149 days of rain under a conifer canopy. Straight answers on what to do, when to book it, and who is licensed to do it in Washington.
of single-family homes in Pierce County have a roof moss can grow on — composition shingle or wood shake.
Pierce County Assessor · 240,015 homesdays of rain a year in Tacoma. Not a lot of water — but far more wet days than Atlanta, at temperatures where nothing dries.
NOAA climate normals, 1991–2020of Tacoma’s annual rain falls November through January — the three months right after the needles come down.
NOAA normals · USDA Forest Service PNW-14Most of what you will read about roof moss and gutter work was written for somewhere else — different trees, different rain, different houses. We wrote this from the manufacturers’ own guidance, Washington statute, NOAA rainfall and Pierce County records — so that when you do pick up the phone, you already know what you are asking for.
Two jobs, two seasons. Moss comes off in spring; gutters come clear in late fall. Most Pierce County homes need both.
Your roof — treat it any dry day, October to May Moss grows all winter and dies back once it is treated. The season is long — any dry day from October to May — and it is the cheapest work on this page.Find your own roof on a five-stage scale and see what it costs to leave it another year.
A dry day between October and May, with spring the sweet spot. Four years of search data and NOAA rainfall show why.
Washington law treats your roof as “land,” which puts moss treatment under the Pesticide Application Act. Most people are surprised.
When to book it, what a thorough visit includes, and the 29,000 gallons a year that have to go somewhere.
Yes — when the type matches your trees. Why the Pierce County needle season is the strongest case for guards, and how the right one gets chosen.
Pierce County. The older tree-shaded neighborhoods come first, because that is where the moss is — share of moss-susceptible roofs sitting on homes built before 1990, measured from the Pierce County tax roll.
Oldest housing, deepest canopyTell us your city and what is above your roof. Two minutes on the phone and you will know exactly where your roof stands and what it needs — at no cost to you.
Call (253) 366-8066 Cascade Roof & Gutter is not a contractor and does not perform work. We connect Pierce County homeowners with independent licensed specialists, and do not warrant work performed by others.