Thermawood Grey Primed Berkshire
The Thermawood Grey Primed Berkshire External Door is a high-performance, thermally rated external door designed for modern homes, renovations and new-build projects. Combining advanced insulated construction with a sleek contemporary design, the Berkshire offers outstanding thermal efficiency, durability and flexibility on site.
Supplied grey primed (RAL 7038) as standard, this external door is ready for final topcoat finishing to suit your project.
Excellent Thermal Performance
Engineered to deliver impressive energy efficiency, the Thermawood Berkshire achieves strong U-values of approximately 1.32 – 1.36 W/m²K, helping to reduce heat loss and improve overall building performance.
Its advanced multi-layer construction includes:
XPS foam insulation core
Structural LVL core with Meranti lipping
Integrated 0.2mm aluminium sheet layer for enhanced strength and stability
Plywood outer layers for durability
45mm overall door thickness
This unique construction makes the Berkshire significantly stronger and more thermally efficient than a traditional stile and rail external door.
Designed for the Elements
The Thermawood Grey Primed Berkshire is built to withstand exposed conditions. Thanks to its reinforced internal aluminium layer and insulated core, this door offers:
Improved resistance to movement and warping
Enhanced durability against changing weather conditions
No requirement for a porch, canopy or recess in many installations
This makes it a practical and reliable solution for both front and rear external door applications.
Contemporary Horizontal Design
The Berkshire features clean horizontal U-groove detailing on both sides of the door, creating a sharp, modern appearance. The minimalist styling works perfectly in contemporary homes while remaining subtle enough for renovation projects.
Finished in Grey Primer (RAL 7038) as standard, it provides the ideal base for final decoration to match your exterior colour scheme.
Generous Trimming Allowance
One of the standout benefits of the Thermawood Berkshire is its flexibility on site. The door can be trimmed by up to 25mm on all edges, making it ideal for:
Renovation projects
Non-standard openings
Replacement doors in older properties
New-build applications requiring adjustment
This level of trimming tolerance offers significant convenience for installers.
Key Features
Thermally rated external door
Excellent U-values (approx. 1.32 – 1.36 W/m²K)
45mm insulated multi-layer construction
Integrated aluminium sheet for added strength
Grey primed (RAL 7038) ready for finishing
Trim allowance of up to 25mm on all sides
Contemporary horizontal groove design
Backed by a 10-year manufacturer’s guarantee
