Six Months Is Not a Marketing Number, It Is When Sealant Is Still Visible

Every expensive RV repair we do started as a cheap one that was deferred. That is not a slogan, it is what the job sheets say.

The interval that matters is six months, and there is a reason for it.

Why six months specifically

Sealant fails in a sequence. It shrinks, then it cracks at the edges, then the cracks connect, then it separates from one substrate, then water gets in.

That sequence takes roughly one to three years here depending on exposure. Six month inspection means you catch it at stage two or three, when it is visible and has not yet admitted water. Annual inspection means you sometimes catch it at stage four or five, which is a repair rather than maintenance.

Southern California is harder on sealant than most climates, which is counterintuitive because it does not rain much. Ultraviolet exposure and heat cycling are what degrade sealant, and we have plenty of both. Rain is only the thing that finds the failure.

What to actually look at

Every penetration individually. Not the roof generally, each one, because they have different ages and different histories.

• Air conditioner gasket, which is the most common single failure point
• Roof vents and fans, each one
• Refrigerator vent
• Plumbing vents
• Antenna and satellite bases
• Solar panel mount feet, if fitted
• Ladder mounts
• Any aftermarket hole anyone has ever drilled, which is frequently the worst offender

Then the seams, which are a different kind of failure:

• Front cap to roof joint
• Rear cap to roof joint
• Roof to sidewall transitions, both sides, with extra attention to the front third
• Any factory membrane seam

Penetration failure versus seam failure

Important distinction because they need different repairs.

A penetration failure is a bead of sealant that has degraded. You can clean it back and reseal it, and that is genuine maintenance.

A seam failure is different. There is butyl tape and mechanical fastening under the trim, and a bead of sealant over the top is cosmetic. Running new sealant over a failed seam achieves close to nothing, because the water path is under the trim. Correct repair means removing the trim or rail, cleaning the substrate back, and installing new butyl and new sealant.

That is why a "we resealed it twice and it still leaks" story is almost always a seam.

What the sealant should look like

Sound sealant is flexible, adhered on both sides, and continuous. Press it with a fingernail and it gives slightly.

Failing sealant is one or more of:

• Shrunk, so you can see a gap at the edge where it has pulled away
• Cracked, especially in a fine crazing pattern across the surface
• Hard, so it does not give under a fingernail
• Chalky, which is UV degradation
• Separated from one substrate along an edge, visible as a dark line

Any of those on a penetration is a reseal item. Two or more across several penetrations means it is time for a full recoat rather than spot work.

The costs, so the arithmetic is visible

• Roof recoat and reseal: $750 to $4,500 and up at 4 to 20 labor hours
• Roof vent and fan replacement: $250 to $1,200 at 1 to 5 hours
• Skylight repair and replacement: $350 to $2,500 at 1 to 10 hours
• Roof membrane replacement: $3,500 to $18,000 and up at 20 to 80 hours
• Full roof replacement including decking: $4,500 to $22,000 and up at 30 to 120 hours
• Water damage restoration and subfloor replacement: $750 to $15,000 and up at 4 to 60 hours
• Sidewall delamination repair: $1,500 to $20,000 and up at 10 to 100 hours

At $210 per hour body and paint, materials at $55 per paint hour.

Read that list top to bottom. Every item below the first two is what the first two prevent. There is no maintenance argument in this industry clearer than that one.

What insurance covers here

Nothing on this list, if it is gradual.

Sealant degradation over years is maintenance. A carrier declining that claim is applying the policy correctly, and it is the most common declined RV claim by a wide margin.

Hail, impact and sudden events are covered. Slow water intrusion from neglected sealant is not, ever, and no amount of framing it as "we discovered it suddenly" changes that.

Which makes the six month inspection the only insurance available on this failure mode.

The version you can do yourself

Twenty minutes, twice a year, on a ladder in good light.

1. Walk the roof if it is rated for it, carefully, feeling for any softness underfoot
2. Look at every penetration individually against the five failure signs above
3. Run a fingernail along each seam edge, looking for separation
4. Look at the underside of the ceiling inside for any staining, especially at the front third
5. Photograph anything questionable so you can compare in six months

That photograph habit is the useful part. Sealant degradation is gradual enough that comparison beats memory.