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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.

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What our customers say

Couldn’t be happier with the product.

Couldn’t be happier.

Jon Roberts

the amazing glass door from FGC

The amazing glass door has transformed our kitchen and given it a wonderful inside/outside living feel and flooded the room with sunlight. It’s a fantastic product. The whole team at FGC were superb.

Gerry Geddes
Gerry

Excellent

A great product from a great company. Friendly and efficient service from day one.

Ian Greenfield
Ian G

Excellent product and great service

I am delighted to have found FGC online! I installed their glass curtain between my office and the kitchen/living room area. It looks fabulous! Easy to use and can be locked.
I visited the factory and it looks smart and professional. All communication has been fast and also very professional. Will definitely use again!

Lilia Severina
Lilia

A great installation

“Thank you again for a great installation, we are really enjoying the extra light.” I will be sending a load more images your way at some point today.

Mr T – Woking

Happy with all your support

The bottom line, I am happy with all your support to get me the financial support for this project.  Without your help the project would not have been realised.

Bashir
Bashire in Cambridge

Great aftercare

We had our doors fitted in 2015 and have been very pleased with them. As with most things there are times when an adjustment is required to the doors or in our case a door needing to be replaced as it had developed a problem with condensation. The company has been very good at resolving

Sunil Parekh
S Parekh

MR VH, Essex

The service I received from FGC was professional and prompt from the initial on site survey through to installation and completion. Added to this the finished product has exceeded my expectations. It has enhanced my home with style and individuality, and enabled me to make use of the space in a way that is ‘unique’.

Stunning Glass Doors

FGC are an excellent family run business. They manufactured and fitted a stunning pair of glass doors for a private client which were complicated in design but FGC were keen and willing to help resolve all details successfully. Would highly recommend. Thank you.

Emma Farquharson
Emma F

Highly recommended

From the first moment of making contact we were given a very personal and friendly service. The survey, fitting and installation were all carried out by helpful and pleasant people. Follow up service was equally good. I am extremely pleased with the results.

Valerie smith
Valerie

Mr & Mrs M – Kingswood, Surrey

I am quite happy to recommend your company to any prospective clients. You have my contact details and you can pass them on if you wish. We are also happy to be on your list of completed installations.   The installation team were very good clean, tidy and polite.   It all started with our

Unfailingly Helpful

It is a good time to say to you that while we still very much the windows, the ease of opening, the views closed or open, now that the weather has turned colder we have been struck quick dramatically by the improvement in insulation.  The large windows here that you/we have replaced were double glazed

Published on September 11, 2017

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