How RV Roof Structures Are Built
Learn about RV roof construction layers, materials, and sealing systems that protect against water intrusion and UV damage.
The roof is your first line of defense. Knowing its material—TPO, EPDM, Fiberglass, or Aluminum—dictates how you maintain it.
Rubber Roofs (EPDM/TPO)
Most common. A rubber membrane is glued over wood decking. EPDM is chalky over time; TPO is shinier and doesn't chalk. Both require specific sealants (lap sealant) that don't damage the material.
Fiberglass and Aluminum
Found on higher-end units and vintage trailers. Harder and more durable than rubber but can be slippery when wet. Seams still need regular inspection and resealing.
The 'Crowned' Roof
Roofs are arched (crowned) to shed water. If water pools (ponds) on the roof, it indicates a structural issue or sagging, which leads to leaks.
Important Notes
- •Inspect roof seals every 90 days—it's an owner's primary duty
- •Use the correct sealant (Dicor for rubber, Silicone often bad for rubber)
- •Be careful walking on roofs; they can be slippery and fragile
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