How Chimney Leak Repair in Flower Mound Works
A chimney leak is a symptom. Before Flower Mound Chimney Sweep Professionals quotes a chimney leak repair, we find out which part is letting the water in, because sealing the wrong one costs money and the stain comes back with the next storm. Every leak call includes a roof inspection, a camera check inside the flue, and a water test when the source is not obvious. You get photos and a written price for the fix.
- Listen. Where is the stain, when does it show, and does it follow wind-driven rain, every rain, or no rain at all? Each pattern points to a different part.
- Inspect inside. Camera up the flue, check of the damper, smoke chamber and firebox for rust, moisture and white mineral deposits.
- Inspect the roof. Cap, crown or chase cover, flashing on all four sides, the mortar joints and brick faces, and the siding on a prefab chase.
- Water test. With a hose we wet one part at a time, lowest first, while someone watches inside. The leak shows up when we reach the real source.
- Quote and repair. Written price for that repair. Most leak fixes are done the same week.
The Five Places a Chimney Leaks
| Entry point | What the leak looks like | The repair |
|---|---|---|
| Missing, rusted or loose chimney cap | Water in the firebox, rust on the damper, drips you can hear | Chimney cap installation |
| Cracked crown (masonry) | Water beside the flue tile, stains on the top courses of brick, efflorescence | Chimney crown repair |
| Rusted chase cover (prefab) | Rust streaks on the chase, water running down the metal flue, rotted siding at the top | Chimney chase cover replacement |
| Failed flashing at the roofline | Stain on the ceiling or wall at the base of the chimney during wind-driven rain | Chimney flashing repair |
| Porous brick and worn mortar | Whole chimney face damp after rain, flaking brick, stains that spread slowly | Tuckpointing, then chimney waterproofing |
Two or three of these often fail together. A crown that has leaked for years usually took the top mortar joints with it, and water that came through a cracked crown then finds the flashing on the way down. The estimate lists each repair as its own line so you can see what fixes what.
Signs You Have a Chimney Leak
- A brown or yellow stain on the ceiling or wall next to the chimney
- Water pooled on the firebox floor or on the smoke shelf after rain
- Rust on the damper, firebox or the metal flue of a prefab fireplace
- White, chalky powder (efflorescence) on the brick inside or outside
- Flaking or popped brick faces, called spalling
- A musty or damp smell from the fireplace after storms
- Peeling paint or soft drywall on the chimney wall
- Rust streaks running down the chase or the brick from the top
Any one of these is reason to book. Leaks in Flower Mound show up most often after the spring hail season and again after the first fall rains, when a crown or flashing that cracked in the summer heat gets its first real test.
Why Chimneys Leak More in North Texas
Flower Mound chimneys go through 100 degree summers that dry out sealant and crack thin crowns, spring hail that dents flashing and chase covers, and storms with wind from the south that drive rain against one side of the chimney. Most homes built from the 1990s on have a prefab fireplace in a wood-framed chase with a galvanized chase cover, and those covers rust through in 10 to 15 years. Older masonry chimneys near Grapevine Lake and Lake Lewisville have crowns and mortar that are reaching 30 to 40 years old. The Chimney Safety Institute of America’s homeowner resources list water as the biggest single cause of damage to masonry chimneys, and in this climate it works fast.
Chimney Flashing Repair
A stain at the base of the chimney, worst during windy storms, is a flashing leak until proven otherwise. We reseal lifted counter flashing, re-bed it into the mortar joint, or replace the step flashing under the shingles. The chimney flashing repair page covers how we tell a flashing leak from a crown leak and what each repair involves.
Chimney Crown Repair
Water in the firebox with a good cap in place usually means a cracked crown. Hairline cracks get a flexible crown coating, wider cracks get patched, and a thin mortar-wash crown gets replaced with a poured concrete crown that overhangs the brick. See chimney crown repair.
Chimney Chase Cover Replacement
On a prefab chimney, a rusted galvanized chase cover is the leak source more often than anything else. It shows as rust streaks on the chase and water running down the metal flue inside. A stainless steel chimney chase cover, cross-broken so water runs off, is the fix.
Chimney Waterproofing
When the brick itself is soaking up rain, the fix is to repair the mortar joints first and then apply a breathable water repellent. Chimney waterproofing is the last step after the other sources are closed, never the first. For everything else, see the main chimney repair page.
Book Chimney Leak Repair in Flower Mound
Flower Mound Chimney Sweep Professionals is veteran-owned and based on Long Prairie Rd in Flower Mound 75028. We find and fix chimney leaks in Flower Mound, Lewisville, Southlake, Colleyville, Keller, Fort Worth and Collin County, 7 days a week from 7 AM to 8 PM. Call (817) 518-6131 or send the form on this page. You get photos of the source, a free written estimate and a firm price before we start.
