Chimney care for Bellevue's postwar housing

Most Bellevue calls start with a sweep, an inspection, or both. What follows depends on the findings: repointing, crown repair, cap installation, flashing repair, leak diagnosis, relining, rebuilds above the roofline, and waterproofing.

1. 1

   Look first

   Firebox, connector, roof, and flue are examined before anything is cleaned or opened up, to establish which system you have and its condition.

2. 2

   Scope and price in writing

   You get both on paper, and nothing starts until you approve it. If the findings change the job, the paperwork changes first.

3. 3

   Photographs before and after

   From the same angles where practical, so you can see the part of your house you cannot reach.

4. 4

   Plain answers

   We say what is urgent, what can wait a season, and what does not need doing at all.

Because the housing here is overwhelmingly postwar — all but two percent built in 1950 or later, roughly 39 percent of it in the 1960s and 1970s — a chimney in Bellevue is as likely to be a listed metal system as a full-height brick stack. A good share of what reads as a chimney from the street is a framed, sided chase with a metal flue inside, and the two are repaired in entirely different ways.

Masonry chimney

Brick or block with a clay tile or metal liner inside, topped by a crown — the sloped slab that sheds water off the masonry. Repaired as masonry: joints repointed, crown recast, counter flashing let into a mortar joint.

Factory-built chimney

A listed metal chimney built from one manufacturer's parts, usually inside a framed and sided chase. Repaired with that system's listed components, and topped by a sheet-metal chase cover rather than a masonry crown.

Relining

Either kind can be relined, but a factory-built chimney limits what fits inside it — a measurement answered on site.

Chimney4u is a service-area business. There is no office or shop in Bellevue — crews travel to the property, which is why the whole city is in range rather than a radius around one address.

That means Bellevue's neighborhood areas as the city lists them: BelRed, Bridle Trails, Cougar Mountain/Lakemont, Crossroads, Downtown, Eastgate, Factoria, Lake Hills, Newport, Northeast Bellevue, Northwest Bellevue, Somerset, West Bellevue, West Lake Sammamish, Wilburton, and Woodridge. Access, not distance, is what varies — a steep Cougar Mountain lot is a different setup from a flat one in Crossroads.

Bellevue permits its own work. Building permits come from the City of Bellevue Development Services Department through its Permit Center. Seattle's SDCI has no jurisdiction here, and Seattle-only rules such as SDCI Director's Rule 07-2025 on unreinforced masonry chimneys govern work there, not on this side of Lake Washington. Bellevue enforces the 2021 I-Codes, effective March 15, 2024, with Washington State and City of Bellevue amendments on top.

• Fireplaces and stoves. A permit is required to install a zero-clearance fireplace, fireplace insert, pellet stove, or similar device.
• Gas piping. A permit is required for a new gas line or a change to an existing one; fireplace logs are among the city's own examples.
• Roofing past the shingles. A permit is required for roofing that modifies or replaces the sheathing — which matters when a flashing repair turns up soft deck.

Water, not fire, is what takes most masonry chimneys apart — CSIA's long-standing position. At Sea-Tac, the nearest long-record station, the 1991-2020 normals show 156.2 days a year with measurable precipitation, about three quarters of the yearly total falling October through March. Leaks begin when a chimney never fully dries between wettings.

Bellevue adds shade. The 2023 canopy assessment measured 8,429 acres of tree cover, 39.3 percent of the city, and two-thirds of Bellevue's trees stand on residential land. A chimney under conifers collects needles on the cap and crown and dries slowly — so caps, crowns, and chase covers are worth checking before the mortar is.

• Which system you have. Masonry repair and listed-component work on a factory-built chimney use different materials and labor.
• Height, pitch, and access. A tall stack, a steep roof, a wooded lot, or a long carry from the street all add setup time.
• How much is involved. Repointing a few feet of joints and rebuilding above the roofline are opposite ends of one service.
• Whether the water source gets fixed. A leak repair that skips the failed flashing, crown, or chase cover behind it gets redone.
• Whether a permit applies. Permitted work carries review and inspection time that routine maintenance does not.

Not sure where to start? A chimney inspection tells you which of the other services you actually need. In Bellevue, cap installation, crown repair, and flashing repair most often follow, because they are what keeps the wet season out. Nearby we cover Kirkland, Redmond, Issaquah, and Seattle — each permits its own work.