The Tampa Bay area carries a famous title: the lightning capital of the United States. From June into September, sea-breeze collisions build storms over the Pinellas peninsula almost daily, and they arrive the Florida way: an intense hour of lightning, wind, and hard vertical rain, most afternoons. Your chimney is the tallest, most exposed thing on the house, and it takes every one of those storms head-on.
The rain is the everyday enemy. Hairline crown cracks let water into the structure a little at a time, tired flashing lets it into the ceiling, and bare brick simply drinks. Masonry can absorb a startling amount of water across a single storm season. The frustrating part is that chimney leaks rarely announce themselves at the chimney: they show up as a ceiling stain a few feet away, a peeling corner, or a damp smell in a spare room. Real chimney leak repair starts with finding the true entry point (crown, flashing, cap, or saturated masonry), because sealing the wrong spot doesn't stop water, it just reroutes it.
Prevention is cheaper than chasing stains. A breathable water repellent, the kind that sheds rain but lets trapped vapor escape, applied before the summer pattern sets in protects brick through the wet months, and in Largo's climate it earns its keep every single afternoon. Chimney waterproofing, a sound crown, and healthy flashing are the three-legged stool of a dry Pinellas chimney; lose any leg and the other two eventually follow.