Your local chimney repair team in Whisper Lakes

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 Whisper Lakes need work in more than one zone, the estimate splits the job zone by zone and notes the access each part needs.

A thin mortar top that crumbles at the edges

Some chimney tops are not a formed crown at all. They are a layer of mortar troweled over the top course and thinned out to almost nothing at the edges. BIA guidance says feathering a cast cap to the edge should be avoided, because it cuts the thickness at the edge and raises the potential for deterioration.

The thin edge is where these tops break up. Pieces chip away, cracks open and the top course of brick is left exposed to every rain. Without an overhang, water that does run off tends to run down the faces as well.

Patching a feathered top with more thin mortar repeats the mistake. The lasting repair is a new cap with a proper shape, thickened at the sides and overhanging the faces, which BIA says reduces the potential for water penetration, and sloped as the code requires. For your Whisper Lakes home, the estimate describes that shape and its materials, so you know it is not another thin layer.

A chimney with more than one flue

Some chimneys carry two or more flues, one for the fireplace and others for a second fireplace or an appliance. Under the Florida Building Code, masonry wythes separate adjacent flue linings, built into the chimney walls, with an exception for two flues venting a single appliance.

Each flue brings its own top detail, and the masonry between flues cannot be seen from the roof, so every flue is checked from its own top. A cap over one flue with its neighbor left open still lets rain into the chimney.

Every flue gets its own findings on the estimate. That makes it clear which flue a repair belongs to, what that flue serves and whether a problem in one affects the use of the other.

• A liner standing above the crown
• Its own caulked bond break at the crown
• A cap that covers the flue it is meant to protect
• The top of the wythe beside it, as far as it can be seen

Rust streaks running down the chimney

Orange or brown streaks down a chimney come from steel above them. They start under a rusting cap, a spark screen, a metal chase top or another steel part at the top, and they grow each time rain runs over the metal.

Rust on a part at the top of a chimney means that part is not standing up to the water it sees. BIA guidance says a metal rain cap should be corrosion resistant, and flashing is expected to be corrosion-resistant sheet metal for the same reason. A part that rusts through lets water in as well as staining the brick.

The fix starts at the source. Each streak is traced up to the part that made it, that part is replaced with corrosion-resistant metal and the stain is treated as a cleaning item for after the repair. On homes in Whisper Lakes, the estimate names the rusting part first and the stain second.