Slide out seals work as a system of three: the wiper seal that sweeps the room, the bulb seal that compresses when it closes, and the D seal at the corners. Replacing one and leaving the others is why most resealed slides still leak. They get replaced as a set.
What causes it
Before anything gets quoted we work out why the damage happened, because the repair is different depending on the cause. On fifth wheels, travel trailers, and Class A and Class C motorhomes, the same visible symptom can come from several different failures, and fixing the wrong one means the vehicle comes back.
Seals are vehicle specific by profile, not universal stock. The wiper seal is a flexible lip that sweeps the top and sides of the room as it moves. The bulb seal is a hollow compressible section that squashes when the room closes. The D seal is a solid D profile used at corners and transitions where the other two meet.
UV degradation: Southern California sun hardens EPDM seals. Once they lose flexibility they stop conforming to the room and water tracks straight past them.
Compression set: A bulb seal left compressed for months in storage takes a permanent flat spot and never recovers its sealing force.
Wiper seal wear: The wiper drags on the room every cycle. On a coach that is used heavily it wears through, and it is usually the first of the three to fail.
Room out of square: If the room does not seat evenly, seals compress hard on one side and barely touch on the other. The light side leaks regardless of how new it is.
Adhesive failure at the corners: D seals at the corners are the most common single leak point, because that is where three seal planes meet and where movement is greatest.
How to tell you have this problem
Most of the vehicles that arrive here from Buena Park have been showing one of these signs for months. Catching it at the first sign is usually the difference between a contained repair and a structural one.
Water on the slide floor after rain: A wet stripe along the inside edge of the room means the wiper or bulb is passing water.
Daylight at a corner: If you can see light through a closed slide corner, you have an open water path.
Musty smell near the slide: Slow leaks show up as odor before they show up as staining, because the water goes into the floor first.
Seal is hard or cracked: Press it. A healthy bulb seal springs back. A failed one stays dented or splits.
Staining on the wall below the slide: That is water that got past the seal, ran inside the wall, and came out lower down.
How we do the repair
Every job is written up before a tool comes out, photographed at each stage, and documented in a form an adjuster can read. Body and paint work is billed at $210 per hour and mechanical and electrical at $260 per hour, both posted publicly so you can check the math on any estimate we hand you.
Water test first. We run a controlled water test to find the actual entry point rather than guessing, because the stain is often nowhere near the leak.
Check squareness. The room is measured against the opening. If it does not seat square, that gets corrected first, because seals cannot compensate for geometry.
Probe for existing damage. We check the slide floor and the wall below for moisture. If water has been getting in for a season, there is damage to address before it gets sealed up.
Replace as a full set. Wiper, bulb, and D seals all come off and all go back new, with proper adhesive at the corners.
Cycle and retest. The room is cycled repeatedly to seat the new seals, then water tested again before the coach leaves.
Materials, parts, and what we actually use
Seals are vehicle specific by profile, not universal stock. The wiper seal is a flexible lip that sweeps the top and sides of the room as it moves. The bulb seal is a hollow compressible section that squashes when the room closes. The D seal is a solid D profile used at corners and transitions where the other two meet.
We use manufacturer profile matched seal, not generic bulk extrusion cut to length. A seal that is close but not correct in profile sits proud in some places and loose in others, which is exactly the condition that leaks.
Where the cheap repair goes wrong
The single most common shortcut is replacing only the wiper seal, because it is the visible one and the easiest to get at. The bulb seal is what actually seals the room when it is closed, and a hardened bulb seal will leak with a brand new wiper in front of it.
The second is sealing over an existing wet area. If the slide floor is already soft, new seals lock the moisture in, and the floor keeps deteriorating out of sight until the room sags enough to jam the mechanism.
The third is skipping the corners. Corner D seals take the most movement and are the most common actual leak point, and they are also the fiddliest to fit, which is why they get skipped.
How this works with your insurance claim
Seal replacement itself is maintenance and is not covered. The water damage behind a failed seal can be covered when it traces to a sudden covered event, for instance an impact that racked the opening or a hail strike that split the seal.
We document moisture readings, seal condition, and opening measurements at intake, which is what turns a claim from an argument into a paid repair.
We bill every major carrier direct, so you are not fronting the repair and waiting on a reimbursement. Under California Insurance Code section 758.5 your insurer cannot require you to use a particular shop. You pick the shop, they pay the claim.
Getting the work done from Buena Park
Our facility sits at 23281 La Palma Ave, Yorba Linda, CA 92887, roughly 13 miles and about 20 minutes from Buena Park using the 91 and the 5. All work is performed here in the 35,000 square foot shop, where we have the frame equipment, the lift capacity, and the paint booth. We do not run route service, because this work cannot be done properly in a driveway.
A written estimate is $150 and is credited against the repair once you authorize it. Bring the vehicle in, or call (714) 909-1444 and we will tell you what to expect before you drive out.
What this work typically costs
Real ranges from our posted catalog, not a marketing number. The spread is wide because the scope is wide, and where your job falls is determined at teardown rather than guessed at over the phone.
| Work | Typical range | Shop hours |
|---|---|---|
| Water damage restoration and subfloor replacement | $750 to $15,000 plus | 4 to 60 |
| Slide out seal replacement, wiper, bulb, or D seal | $400 to $3,000 | 2 to 14 |
| Slide out topper replacement | $450 to $1,800 | 3 to 8 |
Sales tax of 7.75 percent applies to parts and materials. Labor is not taxed. See the full posted rate card.
Frequently asked questions
How often do RV slide out seals need replacing?
In Southern California, expect five to seven years. UV exposure here degrades EPDM faster than the national average. Inspect them twice a year: press the bulb seal and check that it springs back, and look for daylight at the corners with the room closed.
Why is my slide still leaking after I had the seals replaced?
Almost always because only one of the three seal types was replaced, or because the room does not seat square in the opening. New seals on a racked room compress hard on one side and barely touch on the other, and the light side keeps letting water in.
How much does slide out seal replacement cost?
Roughly $400 to $3,000 at two to 14 shop hours, depending on the number of slides and the seal profiles. If moisture testing turns up a soft slide floor, that repair is quoted separately, because sealing over wet structure just hides the problem.
Should I leave my slides in or out when the RV is parked long term?
In, for two reasons. It keeps the seals out of direct UV, and it keeps the room supported. The tradeoff is compression set on the bulb seal, so if the coach sits for many months, cycle the slides periodically rather than leaving them clamped shut for a year.
Do you work directly with my insurance company?
Yes. We bill every major carrier direct, including Progressive, GEICO, State Farm, AAA SoCal, Mercury, Allstate, Wawanesa, National General, Foremost, Liberty Mutual, Good Sam, and The Hartford. We write the estimate, photograph the damage, submit supplements when hidden damage turns up, and deal with the adjuster so you do not have to.
What does an estimate cost?
A written estimate is $150 and it is credited back against the repair once you authorize the work. An in depth diagnostic is $285 for the first hour and is credited the same way. We charge for estimates because a proper one takes real shop time, and that keeps our schedule filled with actual repairs.
Do you come out to Buena Park, or does the vehicle need to come to you?
The vehicle comes to us. Everything happens in shop at 23281 La Palma Ave, Yorba Linda, CA 92887, about 13 miles from Buena Park on the 91 and the 5. We do not run route service. Frame work, structural repair, and refinishing need the equipment and the booth, and nobody can do that job correctly in a parking lot.
What are your posted labor rates?
Body and paint is $210 per hour, mechanical and electrical is $260 per hour, diagnostics and programming is $285 per hour with a one hour minimum, and detail is $95 per hour. Paint supplies bill at $55 per paint hour and body supplies at $5 per body hour. Sales tax of 7.75 percent applies to parts and materials. Labor is not taxed.
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Last reviewed by the OCRV Center shop team.