RV OWNER’S FIELD GUIDE · ROOF & BODY
TPO vs. EPDM vs. Fiberglass Roofs
Three different materials, three different maintenance routines. Know which one is over your head.
TPO (Thermoplastic Polyolefin)
White, single-ply membrane, common on newer travel trailers. Reflects heat well and is relatively easy to clean, but seams and penetrations are heat-welded or taped and need periodic inspection — a failed seam is a leak point that’s easy to miss visually.
EPDM (Rubber Membrane)
Black or white rubber, older but still common. Needs a specific rubber-roof conditioner — regular RV wash soap or the wrong cleaner can dry it out and accelerate cracking. UV exposure is its main enemy over time; a chalky white residue on a black EPDM roof is a sign it needs conditioning, not necessarily failing.
Fiberglass
Rigid, common on higher-end motorhomes and some trailers. Doesn’t need conditioning like rubber, but gel coat can oxidize and chalk over time, and any cracks in the gel coat are a direct path to water intrusion — unlike a membrane roof, fiberglass doesn’t flex to absorb minor stress.