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Stainless Steel Chimney Cap Installation in Seattle
Tired of replacing rusted galvanized caps? A stainless steel cap is the one that stays. 304 or 316 grade, sized to your flue. Free quote, price match.
- Free 2nd-opinion quotes
- Price match + 10–25% discount
- Same-day service often available
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If we had to pick one material for anything that sits on top of a chimney in the Puget Sound, it would be stainless steel. Galvanized caps are cheap because the zinc coating is thin, and once it is scratched or worn through the steel under it rusts in our weather. A stainless steel cap has no coating to wear off; the corrosion resistance is in the metal itself. Installed properly, it is the last cap your chimney should need.
This page is about the material choice. It covers why stainless matters here specifically, the difference between 304 and 316 grade, what mesh gauge does for animals and embers, and how we upgrade a chimney from a rusting galvanized cap. For the mechanics of putting a cap on a flue that never had one, see chimney cap installation; for swapping a failed cap, see cap replacement; for chimneys a stock cap will not fit, see custom-made caps.
We install stainless caps across Seattle, Tacoma, Everett and the road-accessible Puget Sound. Free quote, price match plus 10-25% off.
Symptoms
Signs you need stainless steel cap installation
- Orange rust streaks on the crown or top bricks below a galvanized cap
- You have replaced the cap before and it is rusting again
- Rust flakes or rusty water in the firebox after heavy rain
- The mesh has rusted thin and animals have pushed through it
- The cap looks fine from the ground but the underside and welds are corroded
- A home near the Sound where every exposed metal fitting seems to rust early
Common causes
- Zinc coating on galvanized steel wears through at bends, cut edges and welds, and the steel beneath rusts
- Constant wet exposure through the October-March season keeps galvanized metal from ever drying out
- Acidic flue gases and creosote attack thin coatings from the inside of the cap
- Salt air near Puget Sound shorelines speeds corrosion of coated steel
How It Works
Our stainless steel cap installation process
Before recommending a grade and size, we look at what the cap will face. We measure the flue, check what fuel the flue serves, note how close the house is to salt water and whether the chimney sits in a shaded, slow-drying spot, and look at what the old cap did to the crown underneath. If rust from the old galvanized cap has stained the crown, that comes up in the quote too. Everything is written up and priced for free.
Measure and specify
We measure the flue tile or pipe and recommend a 304 or 316 stainless cap, single-flue, multi-flue or top-mount, with mesh sized for your fuel.
Remove the old cap
The rusted galvanized cap comes off. We clean rust scale from the tile edge and crown so the new cap seats on clean material, and we look down the flue for debris.
Install with stainless hardware
The new cap is clamped or bolted on with stainless fasteners. Mixing a stainless cap with plain-steel bolts is how a good cap ends up loose in a few years; we do not do it.
Seal and finish
Contact points get a weatherproof seal, the mesh clearance is checked for draft, and we photograph the top so you can see the fit.
Check the rest of the top
While we are there, we look at the crown and flashing and mention anything else that needs attention, with no pressure to do it that day.
Options
Repair and service options
Stainless caps are not all the same. Here is what we ask you to choose.
- 304 stainless is the standard grade and the right choice for most Seattle, Renton, Everett and inland Tacoma homes. It resists rust in rain and flue gases and is the better value.
- 316 stainless adds molybdenum for better resistance to chlorides. We recommend it for homes close to salt water on the Sound or in a spot where every metal fitting rusts early. It costs more; we only suggest it where it earns the difference.
- Mesh gauge and spacing: wood-burning flues get a coarser stainless mesh so creosote does not bridge the openings, while still stopping embers and birds. Gas flues can use a finer mesh. Heavier-gauge mesh stands up to raccoons.
- Single-flue, multi-flue or top-mount: same choice as any cap. Full-coverage stainless caps also keep the crown dry.
- Finish: bright or brushed. Both weather to a soft gray rather than streaking.
Galvanized is still available if budget is the only concern, and we will say plainly what the trade-off is. Copper is the other long-life option, at a higher price and with a different look.
Pricing
What affects the price
- 304 versus 316 grade
- Single-flue, multi-flue or full top-mount coverage
- Flue size and count
- Mesh gauge and whether a heavier animal-resistant screen is needed
- Prefab pipe brand, where the listed stainless termination cap is required
- Rust cleanup or crown repair under the old galvanized cap
- Roof pitch and chimney height
Every chimney is different, so you get a written quote after we look at the system. Ask about our price match and free second-opinion quote.
Safety & Seattle Conditions
Safety considerations
Please do not climb up to pull off a rusted cap or check the mesh; rusted galvanized edges are sharp and a wet roof is the wrong place to handle them. We remove and dispose of the old cap as part of the job, and same-day service is often available.
If the old mesh had rusted through and animals have been in the flue, we clear the flue before the new cap goes on. See animal and nest removal. A cap installed over a nest seals the problem in.
Seattle & Puget Sound conditions
Galvanized steel is a fair material in a dry climate. Seattle is not one. Sea-Tac's 1991-2020 normal is 40.34 inches of precipitation a year over roughly 150 to 156 days with measurable rain, and the October-March wet season accounts for about 73% of it. A cap here is wet for months at a stretch, which is exactly the exposure that wears through a zinc coating at every bend and edge.
Shade makes it worse. Regional roofing guidance says Western Washington moss spreads fastest October through April on north-facing, tree-shaded surfaces that dry slowly, and a cap in that position stays damp longer than the rest of the roof. Stainless does not care; that is the whole argument for it.
Our Work
Stainless Steel Cap Installation in action
Upgrade to a stainless steel chimney cap
Call 206-453-2045. Free quote, free second opinion, price match plus 10-25% off, and if you're not happy, we're not done.
☎ 206-453-2045 Request a QuoteQuestions
Stainless Steel Cap Installation FAQ
Is a stainless steel chimney cap worth the extra cost in Seattle?
In our experience, yes. A galvanized cap is cheaper on the day, but with about 40 inches of rain a year and most of it in fireplace season it rusts, stains the crown and eventually has to be replaced, usually more than once. A stainless cap is bought once. We quote both so you can see the actual difference for your chimney, and we price match any written quote and take 10-25% off.
What is the difference between 304 and 316 stainless for a chimney cap?
Both resist rust far better than galvanized. 316 adds molybdenum, which improves resistance to chlorides such as salt air. For most homes in Seattle, Renton, Everett and inland Tacoma, 304 is the right choice. For homes close to Puget Sound saltwater, or where you have already seen metal fittings rust unusually fast, we recommend 316. We will tell you which we would put on our own house in your location.
Can a stainless steel chimney cap rust?
It can show surface discoloration, especially if plain-steel fasteners were used or rust from the old cap was left on the crown and splashed onto it. That is why we install with stainless hardware and clean the crown first. Structural rust-through of a stainless cap is not something we expect to see in a Seattle lifetime of use.
What mesh should a stainless cap have for a wood-burning fireplace?
A stainless mesh with openings coarse enough that creosote does not bridge them but small enough to stop embers and birds. Too fine a mesh plugs with soot and chokes the draft; we have cleared many of those. For raccoon-prone neighborhoods we use a heavier gauge. If the old screen was caked, a sweep is usually due as well.
Can you put a stainless cap on a prefab or factory-built chimney?
Yes, but it has to be the stainless termination cap listed for that pipe brand and size, because the cap is part of the tested system. We identify the pipe and install the matching listed cap. If the chase cover under it is galvanized and rusting, we will point it out; see chase cover replacement.
How quickly can you upgrade my cap to stainless?
For a standard single-flue size we usually have it on the truck, so same-day service is often available in Seattle, Renton, Tacoma and Everett. Multi-flue, 316-grade and prefab-listed caps may take a short wait for the part. Call 206-453-2045 with the chimney type and we will give you a straight answer on timing.
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