Aspect Bifold Doors and Windows are Thermally Efficient Warmcore Profiles which are market leading in both Quality and Technology. 


Traditional Aluminium systems can force you to choose Aluminium aesthetics and finish over Thermal Performance. WarmCore gives you both, with its innovative full width Thermal Core.


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Superior Thermal Performance

At the heart of WarmCore products is a thermal core which significantly out-performs the polyamide thermal breaks commonly used to reduce the threat of cold bridging on aluminium windows and doors. The result is an innovative “warm aluminium” frame construction, carefully dimensioned to provide an optimised 70mm front-to-back overall sash frame depth while ensuring market-leading thermal performance thanks to the multi-chambered insulating core.

Fully concealed multi-chambered cores substantially improve thermal performance when compared to thermally-broken aluminium doors:

  • U-value of 1.4 W/m2K with 28mm double glazing

  • U-value of 1.0 W/m2K with 44mm Triple glazing

Warmer By Design

WarmCore has been designed from the ground up to offer market-leading thermal performance, and comfortably meets the requirements of Building Regulations - Part L. Traditional aluminium doors struggle to meet current legislation, forcing you to choose aluminium aesthetics and finish over thermal performance. WarmCore gives you both, with its innovative full width thermal core.


This unique composite construction creates the most thermally efficient folding sliding door in its class. This design philosophy has produced a folding sliding door that has exceptional thermal performance, helping keep fuel bills lower and heat in your home, while retaining the sleek and architectural look of aluminium.

Weather Resistance

  • Folding sliding door leaves are triple-sealed with contact weather strip gaskets to eradicate draughts and ensure excellent weathertightness

  • Best-in-class weathertightness for all-year-round user comfort

  • Gasket corner mouldings for sash-to-frame and sash-to-sash applications use a push-fit design to neatly and positively couple with straight-cut gasket lengths for easy application, whilst avoiding any need to overrun gaskets to fill gaps between sashes

Hi Tech Elegance

Precision-manufactured with a high quality surface finish and affording slim sightlines when installed, aluminium has become the material of choice for premium folding sliding door applications. WarmCore doors utilise a composite of materials to ensure an end product that is energy efficienct and recyclable combined with the premium quality, structural integrity and architectural design elegance of aluminium to create a product perfect for both residential and commercial building applications.

From the rollers to the handles to the corner assemblies, WarmCore displays an elegance of design that translates into a high performance installed product that looks outstanding.

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25% more efficient as standard
75% more efficient with Triple Glazing
more efficient 
Aspect Warmcore Bifold Doors, Windows, French Doors, Conservatory, Patio Doors, UPVC, Double Glazed, Triple Glazed, Nottinghamshire, Nottingham, Derby, Derbyshire