Chimney repair in Winter Springs.

1. The crown.

   Spanning the top of the masonry, the crown sheds rain off the stack and away from the brick and flue. Florida's building code calls for a slope, a drip edge and a caulked gap around the liner (R1003.9.1), and no part of the stack takes more weather.

   In Hurricane Ian, gauges in and around Winter Springs collected 12.63 to 15.56 inches. A hairline crack can be sealed, but a crumbling slab, or one that has separated from the liner, has to be taken off and recast.

2. Caps and mesh.

   Keeping rain, birds and squirrels out of the flue is the cap's work, and its mesh also holds back sparks. On a masonry chimney, a spark arrestor or rain cap needs a free area at least four times the flue outlet under the Florida code (R1003.9.2, R1003.9.3).

   Storms dent metal caps, wind loosens them and rust consumes them. After rough weather look for dents, screws that have worked out, rusted seams and mesh that sags or clogs. Where swifts nest in the flue, a new cap has to wait: federal law protects the birds, and the Fish and Wildlife Service asks owners to leave their chimneys uncapped.

3. Flashing at the joint.

   Where the chimney rises through the roof, flashing seals the seam. Wind-blown rain probes for any edge that has risen or any sealant that has dried and cracked, and the telltale indoors is commonly a brown patch overhead, or dampness in the attic beside the stack. A chimney wider than 30 inches along the ridge, and not meeting the ridgeline, requires a cricket behind it under the code (R1003.20).

4. Brick, stucco and mortar joints.

   Mortar is made to wear out before the brick it holds. When joints open, damp is wicked into the brick behind its face and the surface begins to peel away, a failure called spalling.

   Tuckpointing means raking out tired mortar and packing the joints with fresh while the brick is still sound. Brick that has split through, or flaked deeply, gets cut out and replaced.

5. Inside the firebox.

   The firebrick and its mortar take flames and heat directly. Open joints or cracked bricks can let heat reach the wood framing behind the wall, and closing a small gap early prevents that.

   

6. The flue liner.

   A liner lines the passage from the damper up to the cap, shielding the structure of the house from smoke and heat; the Florida code says masonry chimneys must be lined (R1003.11). A cracked or displaced tile, or a corroded seam in a metal liner, may pass heat to the framing or fumes into living space, invisible from roof or firebox. Such faults show only to a camera lowered down the flue, which is what a Level 2 inspection does. Winter Springs homes have a median build year of 1989, so the typical flue has served for more than thirty-five years.

7. Metal lids and chases.

   Some chimneys are not masonry at all. A chase is a wooden frame dressed to match the house and capped with a sheet-metal pan, and if the flue inside is factory-built the code asks that it be listed and labeled (R1005.1). When the pan rusts through or sags, rain gathers on it and runs down into the frame. A screened cap on the flue, over a pan that sheds water properly, keeps the inside dry.

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