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Weather tested to BS6375 Part 1
U-value as low as 1.0W/m2k
Secured by design available
Dual colour available
Low threshold available

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Tailored For You

WarmCore is an innovative aluminium folding sliding door system which incorporates a radically different product design approach to deliver a peerless thermal performance framing solution, Warm Aluminium.

Our WarmCore doors are available as inwards or outwards opening doors up to 6m wide, with as many as 7 opening sashes gliding along custom designed tracks. You also have the choice of 4 external aluminium door sash designs. The designs range from a contemporary pencil round to a decorative sculptured look.

With all of Quickslide WarmCore doors, there is a 10-year guarantee. Download our guarantee PDF or speak to one of our experts to find out more.

There are four aluminium colour finishes readily available from stock; white, cream, black and grey. Because you can mix and match colour options to create a dual-colour finish, 16 possible colour configurations are achievable.


Our standard colours were decided upon as they tend to cover about 90% of all bi-folding doors we have had ordered meaning that you can now have any of these colours including dual colour at the same lead time.

Key Features

Standard Handle
Low Threshold
Hinge Assembly
Choice of 4 Clads
Gasket Corner Assembly

Hardware Colours

Matt Black Handle - Warmcore Doors
Matt Black
Brushed Graphite - Warmcore Doors
Brushed Graphite
Satin Silver - Warmcore Doors
Satin Silver
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Product Overview

Custom design

Because the WarmCore Bi-Folding door is precision-manufactured with a high quality surface finish and contains the slimmest of sightlines it offers hi-tech aluminium elegance perfect for both residential and commercial building applications. The doors feature custom designed handles – suited to perfectly match the WarmCore hardware range – available in anodised black or silver.

Secured by Design

You have the opportunity to request SBD (Secured by Design). SBD focuses on crime prevention of homes and commercial premises and promotes the use of security standards for a wide range of applications and products, including windows and doors helping to put the resident at ease.
Please note that the ‘Secured by Design’ window is not standard and must be requested as part of the window specification.


WarmCore doors are certificated to PAS24 and Secured by Design having been independently tested by a UKAS laboratory to prove impressive structural strength and security credentials, giving users added peace of mind. Rigidity and robustness in use are assured.

Energy Efficient

WarmCore sliding door leaves are triple sealed to eradicate draughts and ensure excellent weather tightness. The fully concealed multi-chambered insulating core has been developed to achieve a thermal performance U-value of 1.4 W/m2K with 28mm double glazing and a U-value of 1.0 W/m2K with 44mm triple glazing.


Key Measurements


Frame Depth – 70mm
Standard threshold – 50mm high
Low threshold – 20mm high
Frame and sash sightline – 129mm
Sash to sash sightline – 156mm


Max door width – 6000mm
Max door height – 2400mm
Max sash width – 1000mm
Max load per sash – 100kg

Technical Documents

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