Chimney repair with a free inspection in Pine Hills

Spark arrestor screens and their size

Some chimney caps carry a mesh screen around their sides. That screen is a spark arrestor, and on a masonry chimney the Florida Building Code lists what it has to meet.

A spark screen only helps while its mesh is open. Soot, creosote or leaves packed into it cut down the opening the smoke has to pass through, which works against the open area the code sets.

Where a screen is clogged, bent or rusted through, our crew checks whether cleaning will do or the cap needs replacing, and whether a replacement is sized for your flue. Screen and cap then share one priced line.

• Its open area is at least four times the open area of the flue outlet
• The screen resists heat and corrosion
• It can be reached and removed so the flue can be cleaned

Tile, metal and shingle roofs need different flashing details

Flashing has the same job on every roof. The Florida Building Code says flashing seals the roofing where it is interrupted and keeps moisture from entering the wall and roof at penetrations such as a chimney. How that job is done depends on what the roof is covered with.

The code has separate sections for asphalt shingles, clay and concrete tile and metal roofing, and each points to its own installation rules and manufacturer's instructions. A shingle roof takes step or L flashing worked into the courses. Tile and metal have profiles of their own, and a detail borrowed from a shingle job may not seal them.

Because the flashing ties into the roofing, some jobs need the roofer who installed or looks after that roof. The roof covering is identified before any flashing is priced, and the estimate spells out which work is ours and where a roofer has to be involved.

Vines and plants growing on the chimney

Ivy on a chimney can look settled and harmless, but its small shoots work into voids in the mortar and may carry moisture into them. BIA maintenance guidance lists plant growth among the things that can contribute to water getting into brickwork.

Removing it the wrong way does its own damage. The guidance says to cut vines away from the wall rather than pulling them off, which could damage the brick. The shoots left behind are allowed to dry and darken before they are brushed off with a stiff fiber brush and detergent, and chemicals or acids are not used on them.

Once the growth is gone, the joints underneath get a proper look, since BIA notes repointing may be necessary if the mortar cracks or deteriorates as the ivy comes off. Removal and any joint repair are priced as separate lines.

Factory-built chimneys take their own listed parts

A factory-built chimney is a tested system. The Florida Building Code requires it to be listed and labeled, and installed and terminated per the manufacturer's instructions. The listing belongs to the whole system, which in one maker's instructions runs from the pipe and supports through firestops and shields to the chase top and cap.

That is why a generic part is a problem even when it fits. Those instructions, DuraVent's for its DuraChimney II chimney, say to use only its authorized parts, not to mix parts from other systems and not to improvise. A section borrowed from another brand or a cap bent up from sheet metal leaves the chimney outside the conditions it was tested under.

Before any part is quoted, the chimney's maker and model have to be known. On a chimney in Pine Hills, our technicians read the label where it can be reached and write the maker and model on the estimate, so each replacement matches the system already in the house. If the system can no longer be matched, that is said plainly.