The aluminium bifolding door offers a host of benefits in the home, but what are the slimmest bifolding doors available at the door mullions? With more bifolding door systems available than ever before, if you are a homeowner looking for a quality bifolding door, there is a tremendous amount of choice. One area you may be considering is the appearance and aesthetics at the door mullion. For the trade, this article helps you compare the majority of the UK systems, useful to compare against the products you do sell.
Why choosing the slimmest bifolding doors matters.
One of the promoted features of the bifolding door is the ‘door sightline’. The door sightline is the visible aluminium you see on a closed set of bifolding doors. This is where the door panels meet or referred to as the door mullion.
Our table illustrates the slimmest bifolding doors and the sightline of virtually every major aluminium bifolding door system available today. See how they compare in order of slimness at the door mullion and the sightline dimension you can expect to see.
Other pages In this section
Aluminium bifold doors- What To Consider When Thinking About Bifolding Door Sizes
- How to design open corner bifold doors
- What bifolding door styles are available?
- Who makes the slimmest bifolding doors?
- How to get a low bifolding door threshold
| Alumil Smartia MF65 same as Express Bifolds XP88 | 88mm |
| Schuco ASFD75 | 90mm |
| Smart Systems Visofold 6000 | 94mm |
| Aluco Aluminium steel-look bifold | 94mm |
| Solarlux Ecoline and Highline | 99mm |
| Solarlux SL80 | 105mm |
| Dutemann FD85 (Alumil SF85) | 105mm |
| Express Bifolds XP Vision (Alumil SF85) | 105mm |
| Alunet BF73 Bifolding Door (formerly Alutech) | 107mm |
| Origin OB-49 Bifolding Door | 110mm |
| Greenways Ultra Slim Bifolding Door | 110mm |
| Schuco ASS 80FD | 112mm |
| Sunflex SF75 | 115mm |
| Stellar Aluminium Systems Bifolding Door | 117mm |
| Schuco ASS 70 FD | 120mm |
| Comar FSDX Folding Sliding Door | 120mm |
| Cortizo Bifolding Door | 120mm |
| DeWall Bifolding door by Debar | 120mm |
| StudioGlide by Eurocell (DeWall product) | 120mm |
| Unifold by Arkay Windows | 120mm |
| Deceuninck Decalu88 folding doors | 120mm |
| Air 800 Bifolding Door | 122mm |
| Smart Systems Visofold 1000 Slim | 122mm |
| AluK Luminia F82 Bifold Door | 122mm |
| Reynaers CF 77 SL | 122mm |
| Senior Architectural Alifold Doors | 123mm |
| Senior Architectural PUReFold Doors | 123mm |
| Sunparadise Supertherm 80 Bifolding Door | 124mm |
| Sunparadise Thermo 60 Bifolding Door | 124mm |
| Stayfix Architectural Vision Fold Doors | 125mm |
| Folding Sliding Door Company FD72 | 130mm |
| Velfac 860 Bifolding Door | 130mm |
| Reynaers CF68 | 131mm |
| SAPA Crown Folding Door with slim sash | 131mm |
| Smart Systems Visofold 1000 | 132mm |
| Korniche Bifold Doors by Made for Trade | 133mm |
| Exlabesa Xlafold Bifolding Door | 135mm |
| Centor C1 Bifolding Door | 136mm |
| Sheerline Prestige Bifold Door | 138mm |
| AluK Optio BSF70 Folding Sliding Door | 140mm |
| Sieger Bifolding Door | 140mm |
| Smart Systems Visofold 2000 | 141mm |
| Metal Technology Bifolding Door | 143mm |
| Technal Ambial Bifolding Door | 143mm |
| Reynaers CF77 | 144mm |
| Panoramic Slide and Turn Door | 145mm |
| Kawneer AA3720 Bifolding Door | 145mm |
| Stellar Aluminium Systems Bifolding Door | 146mm |
| Kestrel Folding Sliding Door | 150mm |
| Metal Technology System 26 HI+ Bifolding Door | 153mm |
| Origin OB-72 Bifolding Door | 154mm |
| Smart Systems Visofold 3000 | 154mm |
| Alumina by Liniar | 156mm |
| Warmcore Bifolding Doors | 156mm |
| Solarlux SL70 | 157mm |
| SAPA Crown Folding Door standard sash | 165mm |
| Aluprof MB System Bifolding Door | 166mm |
| Smart Systems Visofold 4000 | 185mm |
How do we arrive at our list of the slimmest bifolding doors?
The data for nearly sixty folding sliding door systems comes from the system company websites or their technical and fabrication manuals. The above sightlines indicate the typical dimension where two intermediate panels meet. Sizes with some systems increase when a folding panel meets the traffic door if one is specified. We excluded frameless and slide and fold doors operating on an individual moving and folding panel basis as well. Also excluded are systems that do not meet current Building Regulations.
However, two bifolding door systems are even thinner than the Alumil Smartia, Schüco ASFD 75 or Visofold 6000 bifolding door, top of the list above. We did not include these two in the list above because these are structurally glazed bifolding doors made around the glass. The above systems are dry-glazed.
The Sieger Lux Bifolding Door.
Our research shows the overall slimmest bifolding doors on the market in the UK right now, to be the Sieger Lux product. This boasts impressive 30mm wide door sash profiles with integrated locking systems. As a result, these give an overall mullion dimension of 74mm.
Unlike the doors above, the Sieger Lux bifolding door comes structurally bonded and allowing the glass to take the weight of the product, reducing the aluminium sightlines as a result. Studying the section drawings of this product reveals thermally insulated aluminium profiles, bonded to 28mm double glazed or 32mm triple glazed units.
Square edges, slimline door components, 3-point locking system, open corner option and traffic doors are just some of the standard features you get. Minimal aluminium frames combined with high specification glass units also provide U-Values of 1.6Wm2K depending on the glass used. As well as this, you get the expected large bifold panel sizes of up to 1.2m wide and 3m high. This is one outstanding door for aesthetics and design and well worth checking out.
The frameless folding sliding Door.
It is worth giving a mention to the frameless bifolding door. These are minimal-framed slide, stack and fold products that, chosen correctly, provide even thinner sightlines. If you want even less visible aluminium, then check out frameless bifolding doors. Sunseeker doors have a mullion sightline of 38mm using a plant-on profile to cover the glass edges.
Frameless Glass Curtains by FGC of Chatham has no visible mullion and only a minimal gasket sight line where the door panels meet. Smart engineering, a patented glass spacer bar and sophisticated gaskets make these doors incredibly thin. Therefore, if you want as much glass as is possible on a bifolding door, we suggest you consider these. A different kind of bifold in design and operation but also a contender amongst the slimmest bifolding doors.
If you are wondering why some well-known big retail brands are missing, this is because many use the above systems or variations of them. This includes well known retail companies such as:
- Express Bifolding Doors using Schuco, Alumil and Smart Systems
- Bifold Direct
- Everest Home Improvements
- Anglian Home Improvements
- Kloeber using Schuco
- Duration Windows using Smart Systems and Aluk
Are the slimmest bifolding doors better?
No. AluK Optio BSC94, Smart Systems Visofold 1000 and Origin OB72 are three bifolding door brands in the UK with excellent sales, given the size of the systems companies by turnover and the volume of bifolding doors supplied. This is despite their doors not being the slimmest on the market. It’s the same with the bifolding door from Stellar Aluminium Systems. They don’t have the slimmest profiles at the mullions, but their entire suite of windows and doors is new, innovative and worthy of consideration.
Centor bifolding doors are probably one of the best on the market. Yet these aren’t the slimmest.
Ultimately a buyer and a manufacturer of bifolding doors takes many different factors into account and not just the bifolding door sightline. However, with the bifolding door market established and with more than 30 systems available, customers have never had more choice.
What to consider when buying standard or the slimmest bifolding doors.
The sightline is just one consideration when buying a bifolding door. It is not just about the slimmest bifolding doors. Here is what else is more important.
- The overall product aesthetic and how it looks like a complete door not just in one area.
- The more door panels, the less intrusive the mullion can appear.
- The quality of the hardware, locks and bifolding door handles.
- The colour, handle, configurations available and other personalisation options.
- The security and weather performance of the product.
- The U-Values provided if energy efficiency is important to you.
- The guarantee available with the product.
- Your confidence in dealing with the company providing you with the doors.
If you’re also considering sliding doors, take a look at who makes the slimmest sliding doors in aluminium.
Every year the Aluminium Trade Supply Website helps thousands of homeowners and the trade find the best products from the proper suppliers. A free service, contact us today for details of the slimmest bifold doors near you, trade suppliers on these or any other windows and doors in aluminium.
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