Local chimney cap replacement for Doctors Inlet homes

Why a screen needs four times the flue's open area

Beyond the opening size, the code sets how much total open space the screen must have. After the wire and frame are subtracted, the screen's clear area has to reach at least four times the clear area of the flue outlet under it. Wire takes up part of every square inch of mesh, so the screen's overall size must be well beyond the flue opening to leave that much air path. The rule explains why a cap for a large flue is noticeably taller or wider than one for a small flue. A cap that looks generous from the yard can still fall short once the wire is counted, which is why we size from the maker's data rather than from appearance.

A screen that comes off for the brush

Florida's code also expects the screen or cap to come off so the flue can be cleaned. So the lid should be hinged or bolted, or a screen panel held by screws that are reachable from the roof. Caps that were glued down, or screwed through the lid into the crown, defeat that expectation and turn a routine sweep into a repair job.

We fit caps whose lid or screen comes away with hand tools, and we show you which fasteners hold it in case another contractor needs to know. The same design lets the mesh be brushed clean on the roof, which is where soot deposits build first.

Clearing nest material before capping

Putting a cap on over an old nest traps the problem inside. Twigs, leaves and droppings on the smoke shelf block the draft and can catch fire from the first ember that reaches them. So the flue is cleared from the top and the shelf is cleaned from below before a new cap goes on.

If an animal is still inside, it has to come out first, and that is a separate job, priced on its own. The room below is covered while the debris comes down. The cap is the final step, the one that keeps the cleared flue clear, and it goes on as soon as the clearing is finished, the same day when the cap is already on hand.