RV roof leak: where the water is coming from and what the fix costs

An RV roof leak in Sebring is fixable on site, and most of the cost question is answered by where the water is actually coming from. A spot reseal is $150 to $400, a full reseal is $500 to $1,200, decking and membrane repair is $2,000 to $3,000 and up, and the surprise answer, a clogged AC condensate pan, is a $200 to $400 cleaning. The trip fee is $75 to $150 and the diagnosis, with photos from the roof, comes first.

Check this first (from inside, ten minutes)

Where is the stain? Directly under the rooftop AC: suspect the condensate pan or the gasket before the roof. At a vent or skylight: suspect the sealant at that penetration. Along the top of a slide opening: suspect the slide seals or topper, not the roof. At the front or rear corner: suspect the cap seam.
When does it drip? Only when the AC has been running for hours on a humid day, and not during rain: that is the pan. Only during or after rain: sealant, gasket, or seam. During rain with the slide out, dry with it in: slide seals.
Press the ceiling around the stain. Firm: the water is recent. Soft or bubbling: the panel has been wet for a while and the decking above may be too.
Look at the AC pan if you can safely reach the roof. Pull the shroud. Standing water with green or black growth in the pan is your answer.
Look at the sealant around the nearest penetration. Lifted edges, black mildew lines along the bead, chalky surface, or gaps you can see daylight through.

Do not walk on any part of the roof that feels soft. Do not climb at all if a ladder is not in your plans anymore; that is what the trip fee and the camera are for.

What is usually wrong

What you observe	Likely cause	Fix and cost
Drip under the AC on humid days, no rain needed	Condensate pan and drains clogged with algae	Pan and drain clean, $200 to $400
Stain under the AC during rain	AC gasket compressed	Gasket replacement, $200 to $450
Stain at one vent or skylight	Lap sealant lifted at that penetration	Spot reseal, $150 to $400
Stains at several points, sealant lifted everywhere	Roof-wide sealant failure	Full reseal, $500 to $1,200
Water at the top of a slide opening	Wiper or bulb seals, or a sagging topper	Seals $200 to $800, topper $300 to $900
Front or rear corner stain	Cap seam sealant	Seam reseal, $300 to $700
Soft ceiling, soft roof underfoot	Decking saturated	Membrane and decking repair, $2,000 to $3,000+

These match the pricing page on top of the trip fee and $125 to $190 hourly labor. The roof cost calculator prices it by rig length.

Why roofs leak here

Sebring gets about 52 inches of rain a year, and more than half of it falls June through September. The muggy season runs from late April to mid-November, July averages 79 percent relative humidity, and July has measurable rain on about 22 days. A bead of lap sealant on a Highlands County roof does not get to dry out between storms for months at a time.

That changes how sealant fails. In a dry climate, sun cracks it from the top. Here, mildew and algae grow along the edge of the bead where it meets the membrane, the edge lifts, and capillary action pulls water underneath. The top of the bead may still look glossy while the bottom has let go. Then a July afternoon storm drives rain sideways under the lifted edge, the water follows the seam into the decking, and it rots in the dark. The stain on the ceiling shows up weeks later.

The other Highlands County mechanism is the air conditioner. A rooftop unit running all day against this humidity is a dehumidifier first, and the gallons of water it removes all pass through a small pan with small drain ports. Algae grows in the pan. The ports clog. The pan overflows into the ceiling assembly, and the first sign is a wet mattress. We take a lot of these calls in July and August, and every one of them is cheaper than the reseal the owner was braced for. See AC dripping water inside.

When to call

Immediately if there is water inside now; active leaks jump the queue. Soon if there is a stain and you do not know when the roof was last resealed. In April or May if there is no stain but the rig sat through last summer without an inspection, because that is the window to reseal before the June rains, and a $700 reseal in April is the cheapest way to avoid a $3,000 decking job in September.

What to expect on the call

Tell us where the stain is, when it drips, the rig’s year, make, and model, and where it sits. We inspect and photograph every penetration and seam, check the AC pan and gasket, press the decking, and show you the pictures before quoting. We work on site across Sebring, Avon Park, Lake Placid, Lorida, and out to Wauchula and Okeechobee.

Frequently Asked Questions

How much does it cost to fix an RV roof leak in Sebring?

A spot reseal at one or two penetrations is $150 to $400. A full reseal of every vent, skylight, and seam is $500 to $1,200. If the water has been in long enough to soften the decking, membrane and wood-rot repair runs $2,000 to $3,000 and up. A clogged AC condensate pan, which is what a lot of 'roof leaks' turn out to be, is a $200 to $400 cleaning.

The ceiling is wet right under the air conditioner. Is that the roof?

Usually not. In Highlands County humidity a rooftop unit pulls gallons of water out of the air every day, and when the condensate pan clogs with algae it overflows straight through the ceiling assembly. The second suspect is the AC gasket, which compresses over the years. We check both before anyone opens a tube of sealant.

Can I just run a bead of sealant over the crack myself?

Over a clean, dry, sound bead, a temporary patch of the right self-leveling sealant can hold until a proper repair. Over a lifted, mildewed bead it will not bond, and here nearly every failed bead is lifted and mildewed. The old material has to come out.

How urgent is a roof leak?

Very. A stain you can see means water has been in the seam for weeks. In a climate where the roof is wet from June to September, decking goes soft in one season. Active leaks jump our queue; say so when you call.