WarmCore Bi Fold Doors

WarmCore Bi Fold Doors: The material debate

That’s material as in timber / UPVC / aluminium or a combination that we are referring to.

All forms of doors and windows have evolved through time and the availability of materials but the Bi- fold door is probably a little different from most – it’s a concept that has been around for a long time the Romans the Greeks the Chinese all historically used forms of folding screens which are the forerunners of what we now call the Bi fold door.

Some of the first Bi fold doors as we understand them were used by Continental Shop and Café owners to open up their premises when weather permitted expanding their sales area into the adjoining street generally they were not dissimilar to their predecessors in as much as they were of a hinged timber leaf construction, later to be replaced by Aluminium as it became the “in vogue” material to be used in the design of shop fronts – although acceptable for shop fronts these bi-folds were far from universally accepted by the more discerning domestic household market. It was the specification that was their early downfall –

Large areas of glass and an ability to open up a room – yes – but poor thermal qualities, a lack of thermal breaks (aluminium frames) clunky and unreliable operating and security systems all lead to a slow uptake from average homeowner.

The original concept has now evolved into something altogether different –
  • Slim line aesthetically pleasing frames
  • Double or triple glazed units that ensure excellent thermal values
  • The introduction of thermal breaks in the frames to enhance “U” values even further
  • Smooth and sophisticated operating systems that glide rather than are dragged into position
  • Low thresholds that actually do prevent water ingress
  • Bright and colourful – white for UPVC or Grey for aluminium are a thing of the past – foils and powder coating have revolutionised the appearance.
  • Possibly the most important – price – as Bi folds are now not seen as simply a commercial product the number of competitors in the domestic market has risen – more manufacturers = more competition = cheaper prices.Specifically, with regard to price one of the harsh facts of life in our world is that “you only get what you pay for” and the same rule also applies too bi- folds – now they have become more competitively priced as more and more traders enter the market i- buy and it is a very large but – t is always worth placing your hard earned money with a tried and tested company you can trust. Enter stage left – Warmcore Homes a subsidiary of the well-established GFD Group of companies which comprises Timber Composite Doors, Global Door, Fusion Door, Composite Door Prices or if it’s just accessories your after Eurosecure specialising in on-line sales the GFD Group of companies is now in its ninth year of trading during which time it has provided some 10,000 + happy customers with installed or DIY Composite Doors.
    As it looks like the renaissance of the domestic bi-fold door is here to stay the question becomes which material is the best for you?

Timber – the most natural of all products they always look good because they are natural but they are generally the one that is the most expensive – the same reasons of warp/ rot/ maintenance etc that caused the move away from timber to UPVC windows and doors plus the demand for slim line features, timber although beautiful when the unit is of the highest quality material, will find it harder to compete unless your door is intended purely for internal use.

PVCU – tried tested competitively priced works well for doors and windows so why would it not be just as ideal for bi-fold doors – the answer is dependent upon what you compare UPVC too and as the most common competitor material in bi-fold manufacture is –

Aluminium – like UPVC it has been around in the Door/window markets forever and as it can be extruded / machined to precise sections it is now available in slim line sections and the revolution in coating techniques has certainly upgraded its image from the unappealing grey to literally whatever you want.

So when choosing between UPVC and Aluminium what points should the householder take into consideration.

  • History – Aluminium bi-fold doors as a commercial product have a history for this form of use – UPVC is pretty new to the market.
  • Size /manufacturing tolerance – Bi-fold doors to work well have to be pretty precisely engineered to very accurate sizes and UPVC because it is fusion welded (simplistically the sections are heated and melted together) currently does not have the ability to match aluminium when it comes to finished tolerance size. there is always a greater degree of finished size tolerance compared with Aluminium. A point to consider and illustrate the point many aeroplanes are manufactured from Aluminium but how many do we know that are manufactured from UPVC
  • Expansion / contraction – to work well bi-fold doors require to be pretty inert when it comes to temperature differentials – UPVC both expands and contract to a much greater degree than Aluminium when subject to temperature change – with the possibility of causing expanding and sticking in the summer when you want to open your doors and shrinking and possibly allowing draughts in the colder winter months.
  • Maximum overall size – for the reasons stated above manufacturing tolerances and expansion / contraction there are currently limitations as to the size of UPVC bi-door if tolerance/expansion/contraction issues are to be avoided these doors are best limited to in the order of 4m wide x 2.25m high – there are no such limitations with aluminium – size is governed simply by that of the opening that it is required to be filled
  • Glazing -with glass weights that can be up to 120kg of glass per leaf if larger designs are chosen the aluminium profile door will generally accommodate such weight due to its manufactured strength and rigidity whereas the UPVC unit will generally require the introduction of more leaves therefore somewhat defeating the unrestricted view when the door is closed.
  • Security and fixings – One is metal one is plastic one is rigid and difficult to cut without professional tools the other can be cut with a “Stanley knife and screw driver combo”. One has the fittings and fixtures attached using precision engineered screws which fix directly to the frame and can be removed and replaced countless times without detrimental effect – the other relies upon “self-tapping” screws finding a purchase on the metal reinforcement of the unit and once removed screws are difficult to relocate.Both UPVC and Aluminium bi- folds have their place both will perform adequately if specified in the correct location –But there is now a further alternative – A COMPOSITE BI-FOLD DOOR- a bi- fold door with a UPVC core set inside a Aluminium frame –


providing the best of both products –

from the Aluminium doors their precision engineered set of frames manufactured to any size required which will be guaranteed to retain their strength and rigidity and be capable of carrying the weight of either double or triple glazed glass panels and provide solid and secure fixings for all of your handles locks and runners from the UPVC – the inner core strength that both improves the “U” values whilst providing a superb “cold break” within the frame all but eliminating the transfer through the structure.

The COMBINATION BI-FOLD DOOR is about to revolutionise the industry with its superb designs strengths and flexibility – so if you are looking for a door as stunning as the one below that has all the benefits of both UPVC and Aluminium –

Make Warmcore Homes your first point of call too sure that you get the superb services and products that the GFD Group of companies provide. Design & Price Your WarmCore Bifolding Door Online Now

See a 7 Pane WarmCore Homes Bi Folding Door in action below

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

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

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.

Weather Resistance

    • Folding sliding door leaves are triple-sealed with contact weatherstrip
    • 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

High Strength Construction

  • PAS24 and Secure By Design (SBD) compatibility as standard provides peace of mind for end users. WarmCore doors have been independently third party tested by a UKAS laboratory to prove impressive structural strength and security credentials
  • Double-strength sash corners are mechanically jointed and use a combination of internal aluminium cleats and a wrap-around corner moulding block to ensure secure rigidity and robustness in use
  • Custom-engineered extruded aluminium hinges are designed with security in mind
  • Hinges clip-fit for ease of on-site installation
  • Integral dog-bolt feature for high security
  • Multiple screw fixings are sited at the knuckle and in the main body
  • Run-through gasket grooves allow for continuous weather-seals
  • Robustly designed to take the weight of triple glazed units as standard
  • Custom-designed sash corner blocks cater for plain corner, shoot bolt, roller casting and pivot hinge applications and these hardware components ensure high quality installation and operational performance
  • Added reassurance for both installers and homeowners is delivered by our custom-designed hardware development partners who underwrite and provide an ERA “Five-Star” security guarantee against forced entry for a period of 10 years.

Call us now on 0208 653 3232 or Let us contact you..

Put us to the test.

MyBest Windows manufacture all double glazing units on-site, using the latest fully automated manufacturing systems. MyBest Windows can install the highest quality products at less than trade prices. No other company in London is quite like us for value and quality and we hope that you will put us to the test. Rest assured our high standards are backed by our recognised accreditations.

Richard Walker

General Manager – Mybest Windows