Your local chimney repair team in Spring Lake

The stack above the roof and the part you never see

A chimney runs through several zones, and each one ages differently. The stack above the roof takes sun and rain on every face. The roof junction depends on flashing. The run through the attic and between floors is hidden behind framing, and the breast inside the room sits behind the finished wall or the fireplace surround.

Hidden sections still have rules. The Florida Building Code does not let the chimney wall or the flue lining change size or shape close to where the chimney passes through a floor, a ceiling or the roof, and it keeps combustible framing back from the masonry. A repair to a crack or a leak in those zones has to leave the shape and the clearance as the code wants them.

Access changes with the zone too. The stack is worked from the roof, while an attic section is reached from inside the house. When homes in Spring Lake need work in more than one zone, the estimate splits the job zone by zone and notes the access each part needs.

Where the flue liner meets the crown

A flue liner should stand up out of the crown rather than stop flush with it. BIA guidance shows the liner extending above the top of the cap, and the Florida Building Code requires a caulked bond break around any flue liner at the cap.

The point of a bond break is that the liner and the cap stay separate pieces. BIA guidance has the cap and liner interface thoroughly primed, backed and sealed to reduce the potential for water getting in. Solid mortar packed tight against the liner locks the two into one rigid piece, and a rigid joint that cracks opens a path for water right beside the flue.

This joint gets its own look on every chimney. The fix is written as a separate item, apart from any work on the crown surface.

• Cracked mortar packed against the liner
• A missing or split sealant bead
• A liner that stops at or below the crown surface

Base flashing and counterflashing work as a pair

Where a chimney passes through the roof, two layers of metal keep water out. Base flashing goes in first. It turns up the face of the chimney and runs out along the roof, and the roofing laps over it, so water on the roof flows across the metal rather than into the joint.

Counterflashing comes second. It is set into the chimney masonry and laps down over the top edge of the base flashing, covering the gap where that layer meets the brick. BIA guidance has the counterflashing lap the base flashing by at least three inches, while the Florida Building Code requires counterflashing on a shingle roof to be corrosion-resistant metal of a set minimum thickness.

When either layer is missing, bent, loose or rusted, water can find its way behind the other. The fix belongs to our chimney flashing repair service, and the estimate says which layer failed and which one stays.

Rust on a steel lintel or support angle

Some chimneys and fireplaces rely on steel to carry masonry. Over a fireplace opening, the Florida Building Code has the masonry supported by a noncombustible lintel with bearing at each end, and brickwork elsewhere can sit on steel shelf angles.

Rust on steel that carries brick is more than a stain. BIA maintenance guidance lists accumulated rust on lintels or shelf angles among the conditions it treats as structural, the kind that warrant a professional engineer's investigation.

Light surface rust and accumulated rust are not the same finding, and the difference is checked up close. At your Spring Lake home, a lintel with heavy rust is written on the estimate as a structural item with an engineer's evaluation recommended, not as a paint job.

• Rust building up in layers on the exposed steel
• Cracked mortar joints just above the steel
• Brick over the opening that has dropped out of line