Stop 02 of 08
A roof is a schedule, not a surprise
Sealant is a maintenance item with an inspection interval. It is not a repair item you discover from a brown ring on the ceiling — by the time the ceiling tells you, the decking has been wet for months.
Twice a year, and after anything hits it. That is the interval, and it is not arbitrary: ultraviolet and heat are what break sealant down, and in Florida a roof gets a full year of both without ever leaving the storage lot. Add a low branch on a campsite road, a ladder leaned in the wrong place, or a pressure washer held six inches from a seam, and you have the other half of the failures we see.
The membrane and the holes in it
Most rigs have a rubber or thermoplastic membrane bonded to a wooden deck; some have fibreglass. The membrane itself rarely fails first. What fails is the sealant around the holes cut through it — the roof vents, the fan flanges, the air-conditioner shroud, the refrigerator vent, the antenna, the ladder mounts, the skylight. Every one of those is a deliberate hole in your roof held closed by a bead of sealant, and each one has its own life expectancy depending on what it is bolted to and how much it moves.
Self-leveling and non-sag are not interchangeable
Self-leveling sealant is for horizontal surfaces: it flows out and seals itself around a flange. Put it on a vertical surface, such as the side of a slide box or a front cap seam, and it runs, thins out and leaves you with a stripe instead of a seal. Vertical joints take a non-sag product. Getting those two the wrong way round is one of the most common things we find on a roof somebody has already had a go at — and the second most common is a new bead laid straight on top of an old failed one that was never removed.
What resealing actually involves
The old sealant comes off, properly, down to the flange. The surface gets cleaned with something the membrane will tolerate. Then the correct product goes on, in the right weather — not in wind, and not on a roof so hot you cannot kneel on it, because a sealant that skins in seconds does not bond. Doing it right takes temperature into account, which is why a good deal of our roof work happens early in the morning.
When we say no
We will tell you plainly when a roof does not need resealing yet, and we say it in writing on the sheet. If two penetrations out of six are cracked and lifting, we do those two and write down that the other four were inspected and left. A whole-roof reseal on a sound roof is one of the easiest large invoices to sell in this trade, and it is one of the least defensible.
And when the honest answer is worse
Sometimes the honest answer is that a repair buys time rather than fixes anything — a membrane that is chalking and going brittle across the whole roof, or decking that has already gone soft in a corner. When that is the case it goes on the estimate in those words, so you can decide whether to spend on a patch or start planning a re-roof. Nobody enjoys that conversation. It is still better than the one where a customer finds out in six months.
Signs worth a phone call
- Any stain on a ceiling, however small, however dry.
- A soft or springy patch underfoot on the roof.
- Sealant that has gone crazed, chalky or has a visible crack you can catch a fingernail in.
- Sealant lifting at an edge, even a short one.
- A branch strike, or anything dropped on the roof.
- A vent lid that has gone brittle and cracked — usually the cheapest job on this list and the one most often ignored until it lets water in.
A stain is rarely under the hole. Water tracks along a rafter before it shows, so we hose test rather than guess.
Two things about roofs that save money
Inspect on a date, not on a symptom
Put it in the calendar twice a year. Ten minutes with a flashlight, looking at every penetration for cracking and lifting, catches nearly everything that later costs thousands. The cost of an early reseal is trivial next to replacing wet decking and the wall below it.
Count the penetrations, not the roof
Ask any shop quoting you a reseal how many penetrations they intend to do and which ones they found failed. A shop that can answer that is doing maintenance. A shop that quotes the whole roof without a count is selling you an area.
Never pressure wash a seam
It is the fastest way to turn a sound roof into a leaking one. A washer will lift the edge of a sealant bead you would otherwise have got years out of. Soap, a soft brush and a hose.
Before the rain finds it
Get the roof looked at on a date you chose
The cheapest roof job is the one booked in a calendar. The most expensive is the one that starts with a stain.