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Glossary of terms for slide and fold doors

The frameless slide and fold doors you see on our website are developed by us to create a slide and fold door for your home like no other. As you do your research around bifolding or even sliding doors, you may come across some technical expressions. So to help you, we have created a glossary of terms for slide and fold doors.

Glossary of terms for slide and fold doors

Glossary of Terms for slide and fold doors.

Some of the terms and definitions used are relevant to all types of folding doors; others are exclusive to our unique frameless doors.

Bifolding door system.

When people talk about a bifolding door system, they are referring to the company that is behind the design of a particular “system”.  The frameless slide and fold doors from FGC are our own bespoke purpose-designed system you will not find on sale anywhere else.

We make our advanced frameless bifolding doors that are fitted by us and guaranteed by us.

Frameless doors.

A frameless door, whether hinged or bifolding is a door with little or virtually no visible framing. Study carefully other versions of slide and fold door marketed as ‘frameless’, and you will see plastic or aluminium extrusions covering the glass edges of the doors.

Only our doors give you a true frameless appearance. The correct definition of a frameless slide and fold door is the one with no visible mullions. Our doors have no visible mullions yet remain secure and highly weather resistant.

Traffic Door.

A traffic door on a bifolding door is an independent hinged leaf that works like a regular door. Traffic doors are very beneficial in enabling you to use the doors all year round without having to slide or fold any of the remaining door panels.

If your new door is the only door out to your garden or you wish to benefit from easy access in and out all year round, we recommend a traffic door.

Low threshold.

Bifolding doors are broadly speaking available with a standard rebated or a low threshold. It is the low threshold that enables you to have the level floors either side of your new doors.

Many bifolding door systems with a low threshold option will advise that there is no weathering or that low threshold doors are only available for internal applications.

The threshold on a frameless slide and fold door is as low as 5mm and still has a weather rating.

Energy efficient glass.

A quality folding door has double glazing or triple glazed units. These glass units are made with warm edge spacer bars, argon gas fill and low-emissivity coatings. These and other materials create energy efficient glass.

Energy efficient glass, when used in conjunction with the thermally broken framing create doors that help reduce your heating bills.

The energy efficient glass used in our frameless slide and fold doors is patented and unique to our doors. On our sealed units, you will find a beautiful transparent spacer bar made of toughened glass, not plastic or metal. We use toughened 20 mm glass spacer at the edges, sandwiched between 4 mm – 6 mm Low Iron (light reflective) or Pilkington Planitherm 4s energy efficient glass with argon gas filling.

Thermally broken aluminium.

Aluminium profiles in their raw form are inefficient conductors of heat. For current slide and fold doors, the aluminium profiles are modified with a thermal break. This is an insulating material that forms a bridge between the inside and outside faces of the aluminium.

Thermally broken aluminium is warmer, better insulated and with the glass, contributes to creating an energy efficient door with low U-Values.

U-Values.

A U-Value is a measure of the thermal performance of a slide and fold door. The lower the U-Value, the better the performance. The glass used in our frameless bifolidng doors has a U-Value of 1.0Wm2K

Bifolding door configuration

The bifolding door configuration refers to how the door is designed for your home. Configuration relates to the number of panels, the sliding direction, whether the doors open in or out and if there is a traffic door.

Colour, handle options and other access also come under configuration.

PAS24.2012

A quality door is subjected to independent testing for its security. One of the most highly regarded security tests is PAS24.2012. PAS24.2012 specifies test methods and other criteria to test the enhanced security performance of doors and windows. These test methods are designed to resist the methods of attack from the opportunistic burglar.

Our frameless glass slide and fold doors are independently tested to PAS24.2012.

Bifolding door stack.

The bifolding door stack refers to the fully open doors where all panels are folded open to one or both sides. When configuring a bifolding door consider how much space the doors will take when in the open position. The more door leaves, the bigger the stack and space taken.

With profile sizes of 45mm, our frameless slide and fold doors take up just 180mm on a four panel set. Conventional aluminium bifolding doors are more than double this dimension.

Bifolding door Mullion/Sight Line

The bifolding door mullion relates to the visible size of any bifolding door when in the closed position. Each door panel meets the next creating a sight line.

The major aluminium systems in bifolding doors have sight lines on average of 120-154mm. Frameless bifolding doors give you only a minimal gasket line as they have no visible mullions or door hinges at this mullion/sight line junction. There is no slimmer slide and fold door on the market.

If you would like further information on our range of frameless slide and fold doors, internal doors or frameless room dividers, contact us today.

FINANCE OPTIONS AVAILABLE

Reviews on Facebook and Google

Quality company with quality product. Very happy with our new frameless folding doors.
Danny B.
Danny B.
10:39 14 Aug 21
Excellent service from start to finish, from sales/admin to site survey to installation. Good communication throughout, very friendly staff and the Frameless Glass Curtains are a serious piece of kit. Quality materials, unique design and look stunning. Thoroughly recommended.
Roger H.
Roger H.
07:56 12 Aug 21
Fantastic service from start to finish, from the surveying, contact with office to the workmen. I have experience through work of a number of companies providing similar products and these guys have been by far the best to deal with
Matt G.
Matt G.
14:12 10 Jun 21
FGC installed a two-panel frameless glass door at our property yesterday. Wow!! the installation is exactly as discussed, and was carried out by two of FGC's team members who were so professional and courteous. They were excellent, and we have no hesitation in recommending FGC and their team to anyone considering such an installation.We are delighted with the installation, and very pleased we chose FGC.Well done FGC!!
d.w.horne
d.w.horne
07:31 10 Jun 21
The quality of the windows / doors are second to none.The customer service was first class from placing the order to installation we were kept informed at every step.The installation team led by Richard left our house and patio cleaner than when they arrivedI would recommend FGC 100%Tony- Burnley
Border S.
Border S.
16:19 28 May 21
From start to finish everything was excellent.Fab u lasThank you
Stephen H.
Stephen H.
20:09 27 May 21
BRILLIANT SERVICE FROM START TO FINISHHighly recommended.
Stephen O.
Stephen O.
09:01 21 May 21
We purchased a beautiful Origin sliding door and side window from FGC. FGC installed the sliding door and window on time, however the sliding door did not fit correctly. Issues can happen. FGC made the process of re-surveying and re-installation very simple. FGC is a very pleasant and professional company to deal with. We are very happy with their service and would strongly recommend them.
Nathan P.
Nathan P.
17:45 20 May 21
Fantastic product fitted by professional abs friendly staff.
Chrissie B.
Chrissie B.
17:07 05 May 21
I love my doors! It’s transformed my place. The people are great, no nonsense, organised and efficient. I’d recommend them to anyone
Darius C.
Darius C.
12:29 05 May 21
The quality of the product and the care taken in design and fitting is excellent. Really pleased with the finish and the service throughout. Excellent value.
Ken K.
Ken K.
09:37 21 Apr 21
Excellent planning and product advice. All the staff were polite courteous and friendly.On the day of the installation, the team arrived bang on time -we live in Wales so a long drive from Kent! They had the job done by lunchtime (fitting a sliding patio door) and I have to say that on first impression of the unit, it looks and feels like solid quality.
Adrian W.
Adrian W.
12:15 13 Apr 21
We had a 5m stretch of these wonderful doors installed several years ago and have been very happy with the uninterrupted view of the garden that they allow from the living room. They are admired by every tradesman who sees them. A minor problem we experienced with water ingress last year was promptly and effectively resolved, and the doors were serviced for free at the same time.
Ian J.
Ian J.
15:06 26 Feb 21
We love our new kitchen windows fitted by FGC - we particularly chose them for their slim frames. Their service has been excellent throughout, including on a recent maintenance item. We would highly recommend them.
Tica C.
Tica C.
13:21 13 Feb 21
Excellent product fitted by professional and friendly staff. Would absolutely recommend.
Bernadette C.
Bernadette C.
14:59 10 Feb 21
Great staff and great products! Have visited the showroom to view doors, really loved all of them! Have referred to a friend - Can't recommend enough
Elly B
Elly B
14:53 22 Sep 20
Really great doors. Really are something different. Expensive, but you really pay for what you get here.
Adam F.
Adam F.
12:56 10 Aug 19
so pleased with the first class service we received from the first phone call to the installation I would highly recommend FGC !
Chris S.
Chris S.
15:47 12 Oct 17

What our customers say

Wonderful product and great service

Following the installation of our new FGC porch, I wanted to give a recommendation for the excellent and diligent service, and wonderful product we received from FGC. Numerous people have commented since we had the work done, and it has clearly added value – both visually and financially – to our property. Also, when the

Paul Jackson
Jackson

Mrs M @ Beaumont Close London SW15

We were very happy with the service offered from start to finish. The frameless glass doors are a perfect solution to our extension and have received many compliments.The workmen who installed the doors were courteous and efficient, the job completed in a few hours, we had a slight problem that needed attending to and this

Fantastic aftercare service!

I had an installation of 4 doors in December 2018. During the cold snap in January this year the outside glass handle cracked. I contacted Sara in customer support and the handle was replaced free of charge by Liam and Alf who did the job quickly and professionally. They also checked that all the doors

Bernard Perry
Bernard

A big thank you

Hi Sara Just to day a big thank you for relating the doors the guys did a great job I had to leave them to it as I was in London Regards Melissa

Mellissa

Mr W @ Church Street Sutton Courtney Oxford

We had been dealing with a large commercial glass door supplier who were extremely slow and unable to meet our requirements for a large opening on our barn. I found your product on the website and came to see you at your farm. You came out the following week and the installation was completed with-in

We are extremely pleased with the doors

The installation of our new doors was eagerly awaited and did not disappoint. The fitters arrived on time on the agreed installation date. All waste was removed and the installation area was left clean and tidy. The fitters demonstrated the use of the system including future self maintenance which was very useful. We are extremely

Start to Finish

From that first phone I knew I had found the product and the company! We wanted an internal glass partition and a bespoke fit. It arrived on time to the exact specifications detailed and was fitted by genuinely helpful guys who want the product to look good and work well. All the staff at the

Craig Ives
Craig

After Sales Customer Service Exceptional

Thank you for your excellent after sales customer service it is exceptional.
The track coating was repaired to a very high standard by Dan the “Magic Man”, he is very professional and his work is very good, to the point that it is difficult to spot where the repair has been made.
Best

JD

Mr S & Mrs M – Leatherhead

Initial contact
FGC were very informative over the phone and were quick to arrange an appointment for us to see the doors at their showroom. They also gave a number of contacts for us to visit to view existing installations. Installation
FGC installers arrived on time and completed the installation quickly and tidily.

Very Pleased with the Freedom the Installation affords

We are very pleased with the freedom the installation affords us with easy access from lounge to dining room. Aesthetically the glass curtain installation is very pleasing. All appears well but we must point out the bottom bar is not firmly fixed in the channel in the floor & moves if one stands upon it.

GB

We had 3 sets of doors installed in April. We had searched far and wide for bifold doors and those supplied by FGC were undoubtedly the most striking. We have had favourable comments from visitors and the doors are functioning well. Our dealings with FGC have been excellent and they have attended since the installation

Couldn’t be happier with the product.

Couldn’t be happier.

Jon Roberts

Published on September 11, 2017

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