Stucco Chimney Chase Repair

A stucco chimney is a skin over a framed box. Under the color coat there is a base coat, wire lath and a weather-resistive barrier, and under those, sheathing and wood studs around the fireplace flue. The stucco sheds most water, but it relies on the layers behind it, and any crack or gap at the top, the corners or the roof line gives rain a route into them.

This is the chimney on a great many houses in Peoria, Chandler, Goodyear and Queen Creek, and it fails in a predictable order. The chase cover, or the joint at its edge, lets water in; the water runs down behind the stucco; and weeks later it shows as a stain, a bulge or a soft spot. Because monsoon storms come in summer, when nobody is near the fireplace, damage can sit for months before anyone notices it.

Signs you need this

• Hairline or stepped cracks running out from corners and openings
• Dark stains or white mineral deposits on the chase
• Stucco that sounds hollow when tapped, or bulges outward
• Peeling paint or color coat on the chimney and nowhere else
• Cracks where the chase meets the roof tile

How we do it

1. Inspect top and sidesChase cover, collar, corners and the roof line, with photos of every crack and stain.
2. Moisture checkWe check for damp behind the stucco where staining or soft spots point to water, so the repair matches the damage.
3. Fix the source firstIf water enters at the cover, collar or flashing, that is dealt with before any patching.
4. Repair and finishCracks opened and filled, damaged sections cut out and rebuilt layer by layer, then textured and coated to blend.

Small patch or water-damage repair?

HomeGuide's 2026 stucco repair guide separates the two, and so do we. Hairline cracks, a chipped corner or a small hole in sound stucco are small repairs, $200 to $800. Once water has rotted the sheathing or studs behind the finish, the stucco has to come off that section, the framing is repaired, and the layers are rebuilt; HomeGuide's range for stucco chimney repair or fixing water damage is $1,000 to $4,000.

The inspection and moisture check are free, and we tell you which kind of repair you are looking at before quoting.

Why the cracks start at the top

Most water problems on a chase begin at its highest point. Water comes off the chase cover, over the edge and down the face; if the cover has no proper drip edge, or the sealant at that joint has failed, water gets behind the top course of stucco. Intense sun and heat age sealant and paint faster, and the top of a chase is one of the most exposed spots on the house.

The second weak spot is where the chase passes through the roof. On a tile roof, the tile, the underlayment and the flashing all have to meet the stucco cleanly, and gaps there let water in.

Matching color and texture

Stucco is rarely one even color after years in the sun. We match the texture first, then the color, and on a fully recoated chase use an elastomeric coating that bridges fine cracks. Many master-planned communities have CC&R rules on exterior colors, so check your HOA's architectural guidelines if the chimney is being recoated.

Most of the cost is labor and access, so fixing the chase cover and the stucco on the same visit costs less than two separate trips up the roof.