Below is the standard roof structure, possible surface elements, and the main types of roofing materials.

Roof Structure

• Covering — the outer layer (TPO, PVC, EPDM, acrylic, or liquid roofing membrane) that protects against moisture and UV rays.
• Plywood — serves as the solid base for the outer covering. The thickness is typically 3/8" or 1/2".
• Insulation — usually mineral wool or polystyrene foam, providing thermal and sound insulation.
• Joist — the supporting frame made of wood or metal. The typical spacing between trusses is 16 or 24 inches.
• Ceiling Liner — the inner part of the RV roof (plywood, MDF, plastic panels, etc.).

RV Roof Parts

• Front Cap — the front part of the RV roof, designed to protect from wind and rain, often with antennas, windows, and ventilation. It is used to attach the termination bar and other components.
• Back Cap — the rear part of the RV roof, similar to the front. It also includes mounts for ventilation and uses the termination bar for sealing.
• Slide Out — a mechanism that allows part of the RV (such as the living room or bedroom) to slide out for more interior space. This roof section has special seals and membranes to protect against water and leaks.

Roof Elements

• Plumbing Vents — elements for air circulation in pipes, such as those in toilet systems.
• Vent — a square hole for ventilating RV spaces such as bathrooms and kitchens.
• Vent Fan — a vent with a fan to improve air circulation, often used in kitchens or bathrooms.
• Skylights — roof windows for natural lighting and ventilation, some can open to improve airflow.
• A/C Units — air conditioning units installed on the roof, which can also provide heating.