A ceiling stain is a late symptom. Water travels along decking and trusses before it finds a place to drip, so by the time you see it inside, it has often been entering somewhere else for months. These are the earlier signals, none of which require getting on the roof.
Granules in the gutters. Asphalt shingles shed their mineral surface as they age, and a heavy accumulation of coarse grit in gutters and downspouts means the shingles are losing the layer that protects them from UV. A little after a new install is normal. A lot on a fifteen-year-old roof is not.
Shingles that look wavy, curled, or lifted from the ground. Anything that isn't lying flat is somewhere wind can get underneath, and Florida supplies plenty of wind.
Cracked or slipped tile. On a tile roof, individual broken tiles are worth fixing promptly — not because the tile waterproofs, but because it shades the underlayment that does. Underlayment left exposed to direct sun fails dramatically faster.
Rusted or lifted flashing at walls, chimneys, and skylights. Most leaks we trace start at a transition rather than in the open field of the roof. Flashing and pipe boots are where roofs fail first.
Dark streaks and heavy algae. Cosmetic on its own, but it indicates a roof holding moisture, and it usually accompanies a roof old enough to have other problems.
Daylight or damp sheathing in the attic. Go up with a flashlight after heavy rain. Visible light through the deck, wet plywood, damp insulation, or a musty smell all mean water is getting in somewhere above.
A sagging roof line. This one is different in kind. Sagging suggests a structural or long-term moisture problem in the decking or framing, and it warrants a call now rather than at your convenience.
If you've spotted any of these, a free inspection will tell you which category you're in. Plenty of roofs we look at need a five-hundred-dollar repair rather than a replacement, and we'd rather tell you that than sell you something you don't need yet.