ENTEGRA ACCOLADE (Super C) – Roof Leak Repair and Resealing

Roof Leak Repair and Resealing for ENTEGRA ACCOLADE (Super C)

Most RV owners assume that a roof leak is just a roof leak—water comes in somewhere, you find the wet spot, you slap some caulk on it, and you’re done. That assumption costs people thousands of dollars on Super C platforms like the Accolade, and here’s why: water doesn’t stay where it enters. On a rig this size, water traveling under the membrane can work sideways through the sidewall cavity, saturate the slide-topper structure, soak the subfloor decking, and rot out structural members that you can’t see until the damage is catastrophic. I’ve taken on two Accolades at fire-sale prices because previous owners caught a small stain on the ceiling, ignored it for a season, and by the time they admitted something was wrong, the repair bill had climbed into five figures. The difference between a ten-dollar fix and a ten-thousand-dollar gutting comes down to one thing: catching it early and sealing it right. This guide walks you through the inspection, removal, and resealing process—skip the steps and you’re gambling with structural integrity.

Required Parts

• Dicor Self-Leveling Lap Sealante Dicor 501LSW-1 Epdm Self-Leveling Lap Sealant-10.3 Oz. Tube, White, 10.3 Fluid_Ounces (Packaging May Vary)
• Eternabond RoofSeal Tape0 EternaBond RoofSeal White 4″ x25′ MicroSealant UV Stable RV Roof Seal Repair Tape | 35 mil Total Thickness – EB-RW040-25R – One-Step Durable, Waterproof and Airtight Sealant
• Rubber roof cleanern Dicor RP-RC-1GL Deep Cleaning Rubber RV Roof Cleanser Spray Refill – White, 1 Gallon

Step-by-Step Instructions

Step 1: Leak Detection and Documentation

Water infiltration in Class C motorhomes stays hidden until real damage takes hold, which is exactly why your first move has to be a careful interior hunt—ideally during or right after heavy rain. Move systematically through the cabin, checking the ceiling from wall to wall, examining every light fixture opening, looking into overhead storage, and paying close attention to the areas directly beneath the roof-mounted air conditioner unit and ventilation penetrations. Watch for staining (brown or yellowish marks), soft or spongy ceiling material when you press on it gently, peeling fabric or wallpaper, visible moisture beading on surfaces, or that telltale musty odor that signals mold. Shine a flashlight into cabinet backs and behind fixtures where your eye can’t normally reach. Take dated photos of each suspect location and sketch them on a simple diagram so you have a clear record of where water has entered. Keep in mind that water running along the underside of the roof can travel several feet horizontally before gravity pulls it down through the interior—so the visible damage point may be nowhere near the actual roof breach.

Step 2: Exterior Roof Inspection and Preparation

Pick a clear day when temperatures fall somewhere between 50 and 90 degrees Fahrenheit—this window gives sealant the best conditions to cure properly. Avoid climbing on the roof if it’s wet, windy, or too hot. Set up a ladder with stabilizer arms and climb carefully; the Accolade’s EPDM or TPO membrane roof can support your weight, but you need to move deliberately in soft-soled shoes and keep your knees and elbows away from any sharp objects that could puncture the material. Start at the front of the rig and work your way back, inspecting every place where something penetrates the roof: air conditioners, roof vents, plumbing stacks, antenna bases, ladder attachments, and especially that transition where the fiberglass cab-over cap meets the rubber membrane. Examine every seam you can see, looking for cracks or gaps in the old sealant, sealant that’s lifting away from the surface, or material that’s gone brittle and chalky with age. Use masking tape to flag every damaged section so you don’t accidentally miss anything when you start repairs.

Step 3: Cleaning and Surface Preparation

New sealant can only stick to a clean surface—this step separates repairs that hold for years from repairs that fail in months. Use a roof-specific cleaner (Dicor RP-RC-1GL works well) and apply it generously to the area you’re fixing, covering at least 6 inches beyond the damaged section in all directions. Let the cleaner sit for several minutes to break down oxidized rubber and accumulated road film, then scrub gently with a soft brush or cloth, and rinse thoroughly with fresh water. For stubborn buildup or old sealant that absolutely has to come off, a plastic putty knife can scrape it away—never use anything metal that could gouge or puncture the membrane. Once you’ve cleaned, the surface has to dry completely before you apply a single drop of new sealant; depending on temperature and humidity, that’s typically 2-4 hours. Moisture trapped underneath new sealant will cause it to fail, so wait as long as you can tolerate.

Step 4: Removing Failed Sealant

Wherever old sealant has cracked, separated, or pulled loose from the surface, you need to remove all of it before laying down fresh material. Use a plastic putty knife or sealant scraper and work slowly and patiently, peeling away every trace of the old material without gouging the roof underneath. If the old sealant has hardened into something rock-solid, an RV-specific adhesive remover can soften it enough to scrape—but test any chemical on a hidden spot first to confirm it won’t damage your roof type. After you’ve scraped down to bare surface, clean the area one more time with roof cleaner to wipe away any oily residue from the sealant you just removed. If you discover a tear, puncture, or serious deterioration of the membrane itself during this work, that area needs Eternabond tape coverage before you apply any lap sealant over it.

Step 5: Applying Eternabond Tape to Damaged Areas

Eternabond RoofSeal tape is a heavy-duty, self-adhesive product that creates a durable waterproof seal when you press it down onto damaged membrane. For any tears, cracks, or areas where the rubber has deteriorated badly, tape should go down before you apply any sealant. Cut the tape so it extends at least 2 inches past the damage on every side—a 4-inch-wide roll works for most job. Peel back the release liner on one end about 2 inches, line the tape up exactly where you need it, and press down firmly. Then gradually peel away the rest of the liner while pressing the tape down as you go, working from one end to the other to keep air pockets from forming. Once it’s fully positioned, use a hand roller or J-roller to apply steady, even pressure across the entire tape surface, paying special attention to the edges where tape is most likely to lift in the wind.

Step 6: Applying Lap Sealant to Seams and Penetrations

Dicor self-leveling lap sealant is manufactured specifically for RV roofs and stays flexible enough to move with temperature swings without splitting or cracking. Load a tube into a quality caulking gun, trim the tip at a 45-degree angle to create roughly a 3/8-inch opening, and start with the roof penetrations. Lay down a complete ring of sealant around the base of each vent, fixture, or antenna mount, overlapping any existing sound sealant by at least half an inch. Don’t skimp—the bead should be about a quarter-inch thick and three-quarters of an inch wide when you’re done. Maintain steady pressure on the trigger so the sealant flows at a consistent rate. For the roof-mounted air conditioner, be especially thorough at all four corners where the unit meets the membrane, as these corners are notorious leak points.

Step 7: Sealing Roof Seams and Final Inspection

The Accolade’s rubber roof comes in sections with seams running lengthwise down the surface. These factory seams deteriorate as UV light and temperature shifts harden the sealant, and they need re-sealing to keep water from running underneath. Apply lap sealant along the full length of each seam, covering the seam itself plus about an inch on each side. Give extra attention to spots where seams meet or terminate—these junctions are weak points. The front cap junction, where the fiberglass meets the rubber, deserves a thick, resilient seal because that area flexes significantly while you’re driving. Once your sealant is laid down, walk back and inspect your entire job from several angles, looking for thin spots, gaps, or bubbles. The sealant will settle and level out over the next 24 hours, but keep the rig parked and don’t go up on the roof during that time. Mark your calendar to inspect and re-seal the roof annually to stay ahead of deterioration.

---

← Back to Top 20 Class C RV Models

The Sealant That Actually Stays Put on Accolade Roof Seams

On Super C platforms, roof lap seams are where water doesn’t just seep in—it migrates laterally into the walls and floor structure before you even know it’s there. Dicor’s self-leveling formula is the only sealant that stays flexible enough to move with the roof expansion cycles without cracking or pulling away from the edges.

What works

• Self-levels into seams without tooling, which means you don’t have to spend an hour feathering it with a wet knife to get it right.
• Stays rubbery and compliant through freeze-thaw cycles—doesn’t crack and split like cheaper acrylic sealants do after the first winter.
• Pairs perfectly with EternaBond tape for a two-stage seal that stops water migration before it starts.

What doesn’t

• One 10.3 oz tube barely covers a full seam run on a Super C roof—plan on ordering two tubes minimum, and three if you’re resealing multiple penetrations.
• Cure time is 24-48 hours in dry conditions; if you’re in damp weather or high humidity, it stretches to a week, which means the rig stays parked.

I once watched a flipper try to skimp with single-part polyurethane sealant because it was cheaper, only to have it shrink away from the edges within six months and let water back in—that’s when I switched to Dicor and haven’t looked back. Dicor 501LSW-1 Epdm Self-Leveling Lap Sealant-10.3 Oz. Tube, White, 10.3 Fluid_Ounces (Packaging May Vary)

This post contains affiliate links. As an Amazon Associate, I earn from qualifying purchases at no extra cost to you.