Honest chimney repair for Avalon Park homeowners

Sealant at the top is a detail, not a cure

Sealant has a proper place on a chimney top, chiefly the joint where the cap meets the flue liner. BIA guidance treats it as part of the construction, to be detailed and installed with the same care as everything else, with proper priming and backing rope behind the bead. It also says oil-based sealants should not be used.

The same guidance warns that caulking is often treated as a way to correct or hide poor workmanship. A thick bead smeared over a cracked crown or a loose top course may look like a repair from the ground. It covers the defect rather than fixing what caused it, and it hides the damage from the next person who looks.

Sealant goes only where it belongs, and old caulk covering a defect comes off so the defect can be judged. The estimate says where sealant is used and what it is sealing.

Step flashing on a shingle roof

On an asphalt shingle roof, the sides of a chimney are flashed with the roofing. The Florida Building Code allows flashing against a vertical sidewall by the step-flashing method or with continuous L flashing, and it sends chimney flashing on a shingle roof to the shingle manufacturer's instructions.

Step flashing is a run of short bent pieces, each tucked in with a course of shingles and turned up the chimney, so every piece sheds water onto the shingle below it. Continuous L flashing is one long angle along the side instead. Where the code spells out an L flashing method, it starts the flashing at the lower part of the roof so every metal lap sheds water.

The shingle maker's instructions control the details, and our crew follows the ones for the shingle on your roof. Your estimate spells out the method, the metal and how the counterflashing will lap over it.

What the attic shows about a chimney leak

If you can reach the attic safely, it often shows where a chimney leak gets in. Look at the framing and roof decking beside the chimney and at the insulation around it. Where the marks start high near the roof, the flashing or the stack above is the likely entry point.

Leave the insulation around a masonry chimney as you found it, and do not pack more into the gap to stop a draft. That gap is an air space the code requires, and a stain beside it is a reason to find the leak rather than to close the gap.

Tell us what you saw and where. The attic signs from your Avalon Park home go on the estimate beside the roofline and top findings, so the repair targets the entry point rather than the stain.

• Dark stains or drip marks on framing
• Soft or discolored decking beside the chimney
• Damp or matted insulation

Film coatings that hold moisture in the brick

Some coatings sit on top of brick as a continuous film. BIA guidance on coatings explains that a film keeps water out from the outside but also inhibits the evaporation of water already inside the masonry, which can lead to clouding and spalling if the source of moisture is not addressed. BIA maintenance guidance goes further and says film-forming coatings should not be applied to exterior brickwork.

Salts make it worse. When water cannot pass out through a coating, dissolved salts can be left behind it, and as they crystallize they can grow enough to break the face of the brick. The coating that looked like protection ends up holding the damage in.

If your chimney is already painted or sealed, the first question is where the water is coming from. Flaking faces and clouding under the film show where to look. Your Avalon Park estimate puts the water repair ahead of any new coat and says whether the existing film is part of the problem.