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Built around a full width thermal core, WarmCore is 25% more efficient at keeping heat in your home than traditional aluminium doors.

In keeping with their attention to quality, WarmCore doors carry a comprehensive 10 year guarantee – covering materials, surface finish and operation. So you can feel confident in your decision to add WarmCore folding sliding doors to your home.

The WarmCore system is also available as single or French doors, ideal for keeping a consistent look with a larger set of WarmCore doors.


The beautiful, strong and secure door that is 25% more thermally efficient than the competition

The innovative design of WarmCore folding sliding doors enables you to split the door sashes in whichever way suits your home. You can have all the sashes fold to the right or left, or have them split in any combination you choose.

In addition certain door configurations offer even more practicality, as the door sashes that meet in the middle, or at one end, can be used as a set of French doors – when you don’t need, or want, the doors fully open.


Whether you are tucked up inside watching TV with your WarmCore folding sliding doors protecting you from the elements, or hosting a garden party with the doors wide open on a bright spring day, you can be assured your doors will look pristine.


Attention has been paid to how the doors look when stacked open, something often overlooked on traditional door systems. When open, all sashes stack neatly inline with each other and are kept perfectly parallel using discreet magnets.

Open ends of door sashes, hidden from view when the door is closed, are also carefully cloaked in uniform black for a neat and thought-through appearance.

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Weather Performance

Triple weather-sealing on all sash interlocks ensures exceptional weather performance, keeping draughts and wind driven rain outside, and you and your family warm and snug. Run-through rubber gaskets create continuous weather-seals helping WarmCore to comfortably exceed the requirements of BS6375-1: the classification for weather tightness on windows and doors.


A U-Value is a measure of heat loss through a structural element. it is calculated on the rate at which heat transfers through 1 square metre of a structure and is stated in W/m2K.

U-Values are used by the construction industry to compare the thermal performance of different materials and products.

Current building regulations require a U-Value of 1.8.

Double Glazing has a U-Value of 1.4.

Warmcore Aluminium Folding Sliding Doors have a U-Value of 1.0 when combined with triple glazing.


A custom designed door lock, available on no other door system, uses a 5 point locking system with 3 opposed hook locks and twin shoot bolts – that engage fully into the aluminium top and bottom tracks – helping keep you and your family safe and secure.

Every WarmCore door is independently certified to PAS24:2012, the benchmark in enhanced security performance requirements for doorsets and windows in the UK.


Available in a choice of 4 powder coated colours, WarmCore allows you to pick a different colour for each side of your door – at no extra cost.


External Sash Style

A choice of 4 external sash and outer frame designs enable you to personalise WarmCore Doors. Pencil round gives a softer look, while Square gives a more precise and contemporary feel.



WarmCore door handles gracefully curve around door sashes when open, tucking into the glass reveal and allowing the door sashes to fold perfectly flat.

Available in 3 hard-wearing finishes, anodised Matt Black and Satin Silver or Brushed Graphite, choose the perfect match to complement your door.

Made to the same exacting standards as the rest of the WarmCore door, the anodised finishes are ideal for use in coastal or exposed locations.


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