What Are Composite Doors Made Of?

Composite doors have become a leading choice for homeowners looking for security, durability, and energy efficiency. But what exactly are composite doors made of, and why are they one of the best door options for both a front and back door? In this guide, we’ll take a look in detail at the materials, construction, security features, and performance of composite doors.

 

The Multi-Layered Construction of Composite Doors

Composite doors are engineered using multiple layers to enhance strength, insulation, and longevity. A Hurst composite door consists of:

• 4mm Glass Reinforced Polyester (GRP) – The outermost layer of a composite door is made from GRP, also known as fibreglass. This material is highly resistant to weathering, scratches, and impacts, ensuring the door retains its appearance. GRP can be finished with a woodgrain effect to replicate the look of timber while requiring far less maintenance.
• CFC-Free Polyurethane (PU) Insulating Foam Core– The core of a composite door plays a crucial role in insulation and structural integrity. At Hurst, our composite doors feature a high-density polyurethane foam core, which provides exceptional thermal efficiency. This foam core is also environmentally friendly, with a Global Warming Potential of less than five and an Ozone Depletion Score of zero.
• uPVC Reinforced Frame – Surrounding the core, a reinforced timber frame which provides further rigidity and stability. This structure enhances the door’s overall strength, making it more resistant to forced entry.
• Multi-Point Locking System – Security is a key consideration for any door, which is why Hurst composite doors are fitted with highly engineered multi-point locking systems as standard. These locks secure the door at multiple points along the frame, significantly improving resistance against break-ins. Homeowners, also have the option of purchasing a Kubu Smart Kit, which enables you to check the status of your door from your phone.

Security Features of Composite Doors

Security is a high priority for homeowners, which is why our composite doors are designed and tested with security features to offer maximum protection. Some key security benefits include:

• PAS 24 and Secured by Design Accreditation – Our composite doors are tested to PAS 24:2022 standards, ensuring they meet strict security requirements. They are also accredited by Secured by Design, a police initiative promoting crime prevention through robust home security measures.
• Impact Resistance – The combination of a GRP skin, reinforced frame, and multi-layered core makes composite doors highly resistant to forced entry attempts.
• Anti-Snap, Anti-Pick, and Anti-Drill Locks – High-security locking systems, including anti-snap cylinders, help prevent common break-in methods used by burglars.

According to UK crime statistics, around 76% of burglars gain access through a door (59% front, 33% back), emphasising the importance of a secure front and back door. With a composite door, you reduce the risk of unauthorised access.

 

Thermal Efficiency and Weather Resistance

A well-insulated door can make a noticeable difference in your home’s energy efficiency. Composite doors are engineered to provide superior thermal insulation:

• U-Values of 1.4 W/m²K or less – The U Value measures how well a component keeps heat inside a building. At Hurst, our composite doors achieve excellent thermal efficiency, helping to reduce heat loss and lower energy bills. The final U Value will be determined by the amount of glazing your composite door contains. However, a Hurst composite door will always meet the requirements of the latest Approved Document L of the Building Regulations. Learn more about thermal efficiency in our blog ‘How A New Composite Door Can Help To Reduce Your Energy Bills’.
• Weatherproof Design –The GRP skin prevents water ingress and resists fading from UV exposure. Our composite doors are also proven to the BS:EN 6375 classification for weather tightness, air, wind and water, providing peace of mind that you are protected from the elements.

 

Choosing a Composite Door with Hurst

At Hurst, we offer a wide range of composite doors designed to provide the perfect blend of security, insulation, and style. Whether you prefer a modern or traditional aesthetic, our composite front and back doors can be customised with various styles, colours, glazing options, and hardware choices to suit your home. Find out more about Hurst composite doors in our blog ‘Why To Choose A Hurst Composite Door’.

Ready to upgrade your home with a durable and secure composite door? Design your dream composite door, or find your local installer.