# Snohomish County Wind Speed & Roof Requirements (2026) | Roofing Everett WA

> Snohomish County's 110 mph prescriptive design wind speed and 25 psf minimum roof snow load, and what they mean for a re-roof or replacement in Everett.

URL: https://roofingeverettwa.com/guide/snohomish-county-wind-speed-snow-load-roof-requirements/

Snohomish County requires a 110 mph prescriptive design wind speed for residential construction under the IRC, and a minimum 25 psf roof snow load. In practice, this means underlayment, fastening, and material choice have to be rated for direct wind exposure, particularly on waterfront-facing Everett properties.

Snohomish County's building code sets specific structural requirements for wind and snow load — real numbers that affect how a roof should actually be built here, not just paperwork.

## The wind speed requirement

For prescriptive structural design under the International Residential Code (IRC), Snohomish County requires a **110 mph design wind speed**. If a project uses IBC-based structural design instead, the applicable wind map under the currently adopted IBC applies. Either way, the wind exposure category — how directly a specific site is exposed to wind, versus sheltered by terrain or structures — is determined on a site-by-site basis.

## Why this matters more on some Everett properties than others

Everett sits directly on Puget Sound at Port Gardner, with no sheltering high ground to the west. A waterfront-facing or bluff-lot property here sits at a meaningfully higher wind exposure category than an inland lot surrounded by other buildings and mature trees — even though both fall under the same county code minimum. We assess actual site exposure, not just the code floor, when specifying underlayment and fastening.

## The snow load requirement

Snohomish County requires a minimum **25 psf (pounds per square foot) roof snow load** — lower than what Cascade-foothill communities require, since Everett's low elevation and coastal location see far less snow accumulation than higher-elevation parts of the county. This is a baseline structural minimum, not a reflection of how often it actually snows in a given year.

## What this means for your roof, practically

- **Underlayment** — high-wind-rated synthetic underlayment, not a standard-grade product, especially on wind-exposed lots
- **Fastening pattern** — matched to the site's actual exposure category, following manufacturer wind-uplift specifications
- **Flashing** — properly sealed at every penetration, since wind-driven rain finds gaps that gravity-fed rain wouldn't
- **Material choice** — while not strictly mandated by wind speed alone, higher-wind-rated materials (architectural shingle over 3-tab, for instance) make more sense on exposed sites

## The bottom line

We install to Snohomish County's actual requirements, adjusted for your specific property's real exposure — not a one-size-fits-all national-average spec. Call for a free inspection and we'll assess your lot's actual wind exposure as part of the quote.

## FAQ

**Does every Everett property see the full 110 mph exposure?**

Wind exposure category is determined site-by-site — a waterfront-facing property near Port Gardner sees more direct, unsheltered exposure than an inland lot with surrounding structures or tree cover, even within the same city.

**Does this affect which roofing material I can choose?**

It affects installation spec more than material choice itself — proper wind-rated underlayment and fastening pattern matter for any material, though metal and architectural shingle generally have higher wind-uplift ratings than builder-grade 3-tab shingle.

**Is snow load a real concern in Everett specifically, compared to foothill areas?**

Less so than in Cascade-foothill communities, but the 25 psf minimum still applies as a baseline structural requirement regardless of how much snow actually falls in a given year.