Chimney Caps and Spark Arrestors

There are two kinds of caps on Valley roofs, and they are not interchangeable. Brick chimneys on older houses, common in Sun City, Glendale, Tempe and central Phoenix, take a cap that clamps or bolts to the clay flue tile or sits over the whole crown. Factory-built fireplaces in stucco chases have a termination cap that is part of the listed chimney system; it is made by the fireplace or chimney maker for that pipe, and a generic cap can change how the unit drafts.

Caps here are beaten by wind more than by cold. Monsoon gusts and dust storms loosen clamps and screws, sun ages paint and sealant, and a cap knocked sideways lets wind-driven rain straight down the flue. An uncapped flue is also an open invitation to pigeons and blown debris.

Signs you need this

• No cap at all on top of the flue
• Cap tilted, dented or loose after a storm
• Screen mesh clogged with debris, or torn
• Rust streaks under the cap, or water in the firebox
• Air pouring down an old brick chimney past a worn damper

How we do it

1. Identify the chimneyMasonry flue or factory-built pipe, one flue or several, and the cap that system calls for.
2. MeasureFlue size, plus the crown or chase cover the cap will sit on.
3. Fit and fastenCap set and secured to stand up to wind; on a factory-built chimney, the listed cap for that pipe.
4. Check the topPhotos of the crown or chase cover around the cap, so you know the condition of the whole top.

Spark arrestors on wood-burning chimneys

A spark arrestor is the mesh screen around a cap that stops embers leaving the flue. In a dry climate, with desert landscaping and wood patio covers around many homes, that matters for anyone still burning wood in an older fireplace. The mesh has to be open enough for the fireplace to draft, which is why a clogged screen can push smoke back into the room.

We clear or replace clogged screens and fit caps with the right mesh for the flue.

Top-mount damper caps for old brick fireplaces

Many older masonry fireplaces have a cast-iron throat damper that no longer seals, so the chimney bleeds conditioned air all summer. A top-mount damper cap seals the top of the flue instead, opened and closed by a cable that runs down to the firebox. HomeGuide puts one at $140 to $420 installed.

Closed, it doubles as a cap, keeping out birds and dust. It is meant for masonry flues; factory-built chimneys use their own terminations.

What a cap costs

HomeGuide's 2026 range for a chimney cap, installed, is $200 to $850. A single small flue sits at the low end; a multi-flue masonry chimney or a large factory-built termination sits higher. The inspection is free, and the price is written first.

If birds are already nesting in the flue, they have to come out before the cap goes on. That is a separate job, covered on our animal removal page.

Checking your cap after a dust storm

You can learn a lot from the yard with a pair of binoculars. A cap should sit square on the flue, with its hood level and the screen intact on every side. After a haboob or a hard monsoon gust, look for a hood that has rotated, a screen pushed in, or a gap between the cap's base and the crown or chase cover.

If anything looks off, don't climb a tile roof to fix it. Book the free inspection; we photograph the top and tell you whether it needs a refasten or a new cap.