Why Your RV Roof Demands Regular Attention
Water damage is the number one cause of costly RV repairs. A small crack in your roof's sealant can allow moisture to infiltrate walls, rot wood framing, breed mold, and destroy your RV's structural integrity — all without being immediately visible inside. The good news: a simple inspection-and-seal routine every six months can prevent all of it.
This guide walks you through everything you need to maintain your RV roof, regardless of whether it's rubber (EPDM or TPO), fiberglass, or aluminum.
Step 1: Know Your Roof Type
Before you buy any products or start work, identify your roof material:
- EPDM (Ethylene Propylene Diene Monomer): The most common rubber roof. Matte black or white, slightly spongy feel. Self-leveling lap sealant is used at seams.
- TPO (Thermoplastic Polyolefin): Shinier white rubber. More UV resistant than EPDM. Requires TPO-compatible products.
- Fiberglass: Harder, glossy surface found on higher-end RVs. Easiest to maintain but can crack at seams.
- Aluminum: Older RVs often have aluminum roofs with rivet seams. Prone to oxidation and requires different sealants.
Check your RV's manual or ask the manufacturer if you're unsure which type you have.
Step 2: Inspect the Roof (Every 3–6 Months)
Safety first: use a proper ladder and check that the roof can support your weight before stepping on it. Some rubber roofs require you to walk on reinforced areas only.
What to Look For
- Cracks or tears in the membrane surface
- Dried, cracked, or missing sealant around vents, AC units, skylights, antennas, and edges
- Soft spots indicating wet or rotted substrate beneath
- Bubbling or delamination of the roof membrane
- Standing water or pooling areas that suggest poor drainage
Use a permanent marker to circle problem areas so you can address them systematically.
Step 3: Clean the Roof Properly
Never use petroleum-based cleaners on rubber roofs — they degrade the material. Use products specifically formulated for your roof type.
Cleaning Process
- Rinse the roof with a garden hose to remove loose dirt and debris.
- Apply a rubber roof cleaner (such as Dicor Rubber Roof Cleaner for EPDM) with a soft-bristle brush.
- Scrub in sections using gentle circular motions.
- Rinse thoroughly and allow to dry completely before applying any sealant.
Never use a pressure washer — the force can lift seams and damage the membrane.
Step 4: Remove Old Sealant and Reseal
Old, cracked sealant must be removed before applying new material. Use a plastic putty knife or a sealant remover tool — avoid metal blades that can scratch or cut your roof surface.
Resealing Steps
- Remove all old, cracked sealant from around every roof penetration (vents, AC unit, antennas).
- Clean the area with isopropyl alcohol and let it dry.
- Apply a self-leveling lap sealant (like Dicor 501LSW for EPDM roofs) generously around all seams and penetrations.
- Feather the edges outward with a gloved finger or brush tool to ensure no gaps.
- Allow to cure per the manufacturer's instructions (usually 24–48 hours) before rain exposure.
Step 5: Apply a Roof Coating (Optional but Recommended)
A UV-reflective roof coating extends the life of your membrane and reduces interior heat. Products like Dicor RP-MRC-1 (for rubber roofs) or a fiberglass wax/protectant can be applied once or twice a year. This is especially valuable if you park in sunny climates.
Maintenance Schedule Summary
| Task | Frequency |
|---|---|
| Visual inspection | Every 3 months |
| Full cleaning | Every 6 months |
| Sealant inspection & touch-up | Every 6 months |
| Full reseal of all penetrations | Every 1–2 years |
| Roof coating application | Annually (sunny climates) |
A little time on the roof twice a year is a small investment compared to the thousands a water-damage repair can cost. Make it a habit — your RV will thank you for years to come.