The material type you choose for your bi-folding doors is probably one of the first and most important considerations.

Typically, within the bespoke bi-folding door market, there are 3 main choices.

Thermally broken aluminium systems, which are definitely the most commonly used and popular choice for many reasons. Aluminium is virtually maintenance free and is far longer lasting as a material than uPVC. Aluminium can be finished in just about any choice of colour and with a number of different finishes. It can be produced as large panel sizes with slim slightlines, making it exceptionally pleasing from an aesthetic point of view. Aluminium can be marine treated making it perfect for coastal locations and a large proportion can be recycled, in fact two thirds of all the aluminium ever produced is still in use today.  The panels are constructed from extruded aluminium profiles which are split by a poly-amide thermal break to prevent heat transfer between the internal and external face of the door.  This is the minimum requirement for any aluminium door in order for it to conform to building regulations.

Secondly, timber systems. The highest quality timber systems are produced in engineered timber that has been triple laminated to increase the strength and reduce chances of the timber warping over time. The types of timber available vary, but oak and pine are the most commonly used.

As timber is naturally insulating in comparison to aluminium, there is no requirement for a thermal break between the inside and outside faces.

And finally, composite systems. This is a combination of aluminium and timber. Choosing a composite system allows for all the warm and natural appearance of timber internally, whist providing all the maintenance free benefits of aluminium to the exterior. Due to weathering, any system using timber externally would require re-painting or staining within two to three  years, then annually thereafter. This requirement is therefore avoided through the use of a composite system.