Your RV’s roof is its first line of defense against the elements — and if you have an EPDM (Ethylene Propylene Diene Monomer) rubber roof, proper maintenance is the key to keeping leaks out and extending the life of your rig. EPDM roofs are found on a wide range of travel trailers, fifth wheels, and motorhomes, and with the right care, they can last 20 years or more. Neglect them, however, and you’re looking at costly water damage, delamination, and structural rot.
In this guide, we’ll walk you through everything you need to know about caring for your EPDM rubber roof — from routine cleaning to resealing seams, applying a protective coating, and knowing when it’s time to call in a professional.
What Is an EPDM Roof and Why Does It Need Maintenance?
EPDM is a synthetic rubber membrane widely used on RV roofs because of its flexibility, durability, and resistance to UV rays, ozone, and extreme temperatures. It’s installed as a single sheet stretched across the roof and bonded to the decking underneath.
Despite its toughness, EPDM is not indestructible. Over time, exposure to harsh sunlight, tree sap, bird droppings, and standing water can cause the membrane to dry out, crack, shrink, and pull away from seams and edges. Regular maintenance prevents these issues before they lead to expensive repairs inside your RV.
Step 1: Inspect Your EPDM Roof Regularly
The foundation of any good roof maintenance program is regular inspection. You should inspect your RV roof at least twice a year — ideally in the spring before camping season and in the fall before winter storage. After any major storm or long road trip, a quick check is also a good idea.
What to look for during your inspection:
Cracks, tears, or punctures in the rubber membrane
Lifting or peeling at the seams and edges
Dried or cracked lap sealant around vents, skylights, air conditioners, and antennas
Soft or spongy spots on the roof deck, which could indicate water infiltration
Discoloration or pooling water areas
Catching problems early — a small crack or gap in sealant — can prevent water from working its way into the walls and ceiling of your RV, where it can cause thousands of dollars in damage.
Step 2: Clean Your EPDM Roof Properly
Cleaning your EPDM roof is more than cosmetic — it removes contaminants that can break down the rubber over time and helps you spot damage you might otherwise miss. You should clean your roof at least twice a year, or more often if your RV is stored under trees.
What you’ll need:
Soft-bristle brush or non-abrasive scrub pad
EPDM-safe rubber roof cleaner (such as Dicor Rubber Roof Cleaner or Camco Rubber Roof Cleaner)
Garden hose or bucket of water
Ladder and roof-safe shoes
Cleaning steps:
Rinse the roof with clean water to remove loose dirt and debris.
Apply the EPDM roof cleaner according to label directions. Avoid petroleum-based cleaners, harsh solvents, or citrus-based products — these will degrade the rubber.
Scrub in a circular motion, working from front to back.
Rinse thoroughly with clean water.
Allow the roof to dry completely before applying any sealant or coating.
Pro tip: Never use a pressure washer on an EPDM roof. The high pressure can force water under the membrane, lift seams, and cause serious damage.
Step 3: Reseal Seams, Edges, and Penetrations
Sealing is the most critical part of EPDM roof maintenance. Water always finds the path of least resistance, and the seams, edges, and areas around roof penetrations (vents, AC units, antennas, TV dishes) are the most vulnerable spots.
What you’ll need:
EPDM-compatible self-leveling lap sealant (such as Dicor Self-Leveling Lap Sealant) for horizontal surfaces
Non-sag lap sealant for vertical surfaces and sidewalls
Putty knife or plastic scraper
EPDM primer (if resealing over bare EPDM or after removing old sealant)
Caulk gun
How to reseal your EPDM roof seams:
Remove old sealant: Use a plastic scraper or putty knife to carefully remove cracked, dried, or peeling lap sealant. Avoid cutting or gouging the rubber membrane.
Clean the area: Wipe the area with a clean cloth and EPDM-safe cleaner to remove all residue, dirt, and oils. Allow it to dry completely.
Apply primer if needed: If you are sealing over bare EPDM rubber or re-bonding a lifted edge, apply an EPDM lap sealant primer and allow it to tack up before applying sealant.
Apply new lap sealant: Load your caulk gun with the appropriate sealant. Apply a generous bead over all seams, around every roof penetration, and along all edges. Dicor self-leveling sealant will flow into gaps on its own; non-sag sealant should be tooled smooth with a wet finger or spatula.
Overlap generously: Make sure the sealant extends at least 1 to 2 inches on either side of every seam or penetration to ensure a watertight bond.
Allow to cure: Give the sealant adequate time to cure (typically 24–48 hours) before exposing it to rain or applying a roof coating.
Important: Always use sealants specifically formulated for EPDM rubber roofs. Using the wrong product — such as silicone caulk or standard roofing caulk — can actually damage EPDM and will not bond properly, leading to premature failure.
Step 4: Apply an EPDM Roof Coating for Long-Term Protection
After cleaning and resealing, applying a quality roof coating is the best way to extend the life of your EPDM roof. A roof coating adds a protective layer that reflects UV rays, prevents oxidation, and keeps the rubber membrane supple and flexible. It also provides an extra waterproofing barrier over your sealant work.
Choosing the right coating:
Not all roof coatings are compatible with EPDM rubber. You must use a coating specifically formulated for EPDM roofs. Popular options include:
Dicor EPDM Roof Coating – A water-based acrylic coating designed specifically for EPDM rubber. It goes on white, reflects sunlight, and helps keep the RV interior cooler.
Liquid Roof (EPDM Coat) – A one-coat EPDM liquid rubber product that bonds directly to the existing EPDM membrane and forms a seamless, watertight barrier.
Heng’s Rubber Roof Coating – Another widely used option among RV owners that restores and protects the membrane.
How to apply EPDM roof coating:
Make sure the roof is completely clean and dry. Any moisture trapped under the coating can cause it to bubble or peel.
Ensure all resealing work has fully cured before coating.
Stir the coating thoroughly before use.
Apply the coating with a long-handled paint roller (3/8″ nap) or brush, working in long, even strokes from one end of the roof to the other.
Apply two coats for best results, allowing the first coat to dry completely (usually 2–4 hours) before applying the second.
Pay extra attention to seams and edges, applying additional coating in those areas for added protection.
Allow the final coat to cure for at least 24 hours before rain exposure.
How often to recoat: Under typical conditions, an EPDM roof coating should be reapplied every 2–3 years to maintain full protection. In hot, sunny climates like Florida, annual recoating may be warranted due to intense UV exposure.
Step 5: Address Repairs Before They Become Bigger Problems
If your inspection reveals actual holes, tears, or areas where the membrane has separated from the decking, you’ll need to do some repairs before sealing and coating.
For small punctures or tears (under 2 inches): Use an EPDM repair patch kit. These kits include a piece of EPDM membrane and EPDM-compatible contact cement. Clean the damaged area, apply cement to both the roof surface and the back of the patch, allow it to become tacky, press the patch firmly into place, and roll it with a seam roller to ensure full adhesion.
For larger damage or delamination: Larger repairs — including sections where the membrane has lifted significantly or where the underlying wood decking has rotted from water damage — are best handled by an experienced RV service technician. Attempting a major repair without the proper materials and techniques can lead to more problems down the road.
EPDM Roof Maintenance Schedule: A Quick Reference
Every 3–6 Months: Visual inspection of the entire roof surface, seams, and sealant. Clean with an EPDM-safe cleaner.
Annually: Full inspection, reseal any cracked or missing lap sealant, touch up coating as needed.
Every 2–3 Years: Apply a full fresh coat of EPDM roof coating over the entire roof surface.
As Needed: Repair any tears, punctures, or areas of delamination promptly — do not wait for the next scheduled maintenance.
Common Mistakes to Avoid
Using petroleum-based or citrus cleaners: These break down the EPDM membrane and should never be used.
Skipping the primer: When resealing bare EPDM, skipping the primer step leads to poor adhesion and early sealant failure.
Using incompatible sealants: Silicone, polyurethane, and butyl caulk products are not designed for EPDM and can cause long-term damage to the membrane.
Walking on the roof improperly: Always step on the structural rafters or use a piece of plywood to distribute your weight. Walking directly on the EPDM membrane can cause it to stretch and stress the adhesive bond.
Applying coating over a wet or dirty roof: Moisture or contamination under the coating will prevent proper adhesion and cause premature failure.
Waiting too long between maintenance cycles: EPDM damage is cumulative. Small problems compound quickly, and a $20 tube of sealant applied at the right time can prevent a $5,000 interior water damage repair.
Trust the Experts at Southern RV for Your RV Roof Needs
At Southern RV in DeLand, Florida, we know that a well-maintained roof is the key to protecting your investment. Whether you’re a seasoned do-it-yourselfer who just needs the right products, or you’d prefer to have our experienced service team handle your roof inspection, resealing, and coating — we’re here to help.
Our service department stocks the proper EPDM-compatible sealants, cleaners, and coatings, and our technicians have the experience to diagnose and repair roof issues of every kind before they become major headaches.
Don’t wait for a drip inside your RV to tell you there’s a problem. Schedule a roof inspection with our service team today or stop by our parts department to get everything you need to tackle your EPDM roof maintenance yourself. Visit us at Southern RV in DeLand, or give us a call to speak with one of our service advisors.
A little time and effort now can add years of life to your RV roof — and keep your adventures on the road instead of in the repair bay.
