The season nobody is home
Most roofing problems are described as a matter of materials. Here the decisive factor is a calendar. The wet season and the empty season are the same six months, so the failures that matter most are the ones nobody is standing under.
- 1 The ridge. The highest, hottest course, and the one the sun works on all day.
- 2 The field. Tile or shingle above, and the underlayment that actually keeps water out below.
- 3 Valleys. One channel carrying what two slopes shed, at the pace this coast rains.
- 4 Flashing. Where the lanai and the enclosure meet the house, and where neither trade owns the seam.
- 5 Penetrations. Every vent and curb is a hole the underlayment has to seal, and the first place it stops.
- 6 Eaves and metal. Drip edge and fasteners, which salt air reaches years before it touches the covering.
Two calendars that line up badly
Rain on this coast is not spread through the year. It concentrates into daily afternoons from roughly June through September, and those are precisely the months when a large share of houses between Punta Gorda and Naples are shut, shuttered and unvisited. A roof that opens in the first week of that season gets four months of water before anyone walks in the door.
The difference is not academic. A leak found in week one is a flashing repair and a ceiling patch. The same leak found in month four has been running down a truss, into insulation, and along a wall cavity for a hundred afternoons. The roof problem is the small part of what has to be fixed by then.
What a closed house hides
Air conditioning is usually left high or off in an empty house, so the interior stays warm and humid. Water that gets in does not dry. Staining spreads slowly enough that a returning owner often reads it as one recent event rather than a season of them, which is why the first estimate is frequently for the wrong scope of work.
It also explains a pattern that surprises people: the worst damage is rarely under the biggest opening. Water travels along framing before it drops, and with four months to travel it can surface a long way from where it entered.
What to do with that
The practical answer is timing rather than technology. An inspection in late spring, before the house is closed, is worth several done at any other point in the year, because it catches the things that would otherwise run unwatched all summer. The same visit in October tells you what the summer did.
For anyone buying, it reframes the age question. A ten-year-old roof that has been looked at twice a year is in a different condition from a ten-year-old roof on a house that has been empty every wet season since it was built, and no listing distinguishes between the two.