Composite doors are made from a mix of materials layered together, usually including a strong timber or high‑density foam core, a tough GRP (glass‑reinforced plastic) or similar outer skin, and uPVC and/or metal reinforcement around the frame and edges.

Quick Scoop

Think of a composite door like a “layered sandwich” built for strength, security and insulation.

  • Inner core :
    • Solid timber laminates or a high‑density polyurethane foam core (for strength and thermal insulation).
  • Outer skin :
    • GRP (glass‑reinforced plastic/fibreglass) or similar tough composite skin, often moulded with a woodgrain effect and coloured finish.
  • Frame and reinforcement :
    • uPVC framing and steel or timber reinforcement to add rigidity and prevent warping or twisting.
  • Insulation & seals:
    • CFC‑free polyurethane foam in some designs, plus multi‑point locking systems, weather seals and sometimes steel hinges for security and airtightness.

In short, instead of being just plastic (like a standard uPVC door) or just wood (like a traditional timber door), a composite door combines several carefully chosen materials so you get better durability, security and energy efficiency in one package.

Information gathered from public forums or data available on the internet and portrayed here.