We’ll do our best to cover the questions we’re asked most often about Integral, but if there’s something you’re not sure of, just get in touch. Any new door is an investment and although we know Integral is an outstanding bifolding door, we want you to be completely sure that Integral is the right choice for you.
We’ve divided the questions into loose categories for convenience, but feel free to look at any section.
No. Dual-coloured options are available.
Integral bifolding doors have advanced multipoint locking to the main access door and robust shootbolts which secure secondary doors and folding leaves the top and bottom tracks. Anti-lift systems prevent leaves being lifted from the frame. Combined with superb hinges, tamper-proof lock cylinders and toughened or laminated glass, they can pass the most stringent security tests and meet the requirements of both Secured by Design and Approved Document Q.
No, and that is one of their main advantages. You will need to wash the frames (perhaps twice a year, depending on your location), keep the tracks clear with a vacuum and occasionally lubricate the shootbolts.
Of course. The system has been water ingress and air permeability tested to 300 Pascals.
Every set of bifolding doors is a little different, and overall size and glazing will determine the actual thermal performance, but the standards are very high with the best band A+ Window energy ratings possible.
Yes, you can choose either style for opening, but note that each individual set of doors can only open one way. Inwards opening doors can be practical when outside space is restricted, but you’ll need to ensure furnishings are out of the way.
In most circumstances, planning permission is not required, although if your home is listed or in a conservation area, you may find there are restrictions on the changes you can make to your home. Your local authority will be able to provide the answer.
Although planning permission is not normally needed, any installation work must be carried out in line with Building Regulations. An experienced installer will ensure the regulations are observed.
Like all metals, aluminium conducts both heat and cold. To protect your home from this effect, the indoor and outdoor portions of the aluminium sections are separated by a layer of non-conductive material. This improves insulation and helps control your energy usage.
Certainly. Integral can accommodate 36, 40 or 44mm triple glazing.
We’re in favour of the tracks being at the bottom. We think they’re easier and more stable to operate and overall, less likely to be problematic. Our system uses parallel stainless-steel tracks and quad stainless-steel rollers with wiper brushes to spread the load and resist debris build-up.
All that extra glass does make a difference, but there are ways of coping. Many choose simple blinds to screen the sun. Some choose blinds that sit within the double-glazing system itself, or you can choose solar-control glass which is coated to prevent heat building up.
The beauty of the bifolding door design is the wide-open feel and we certainly wouldn’t want a big step to get in the way. Low thresholds must be carefully installed to prevent rainwater getting into your home and our installation experts will be happy to explain the options to you.
Not at all, although larger installations (you can go up to 6.3 metres) can be very dramatic. 3-pane bifolds can start at just a little over two metres wide and can bring a much more open feel to your home.
We can only answer “it depends”. Prices depend on factors such as size, glazing options and the complexity, or otherwise, of the installation work itself. What we can say with confidence is that the transformation of your home will be well worth the cost. Any installer we recommend will be happy to give you a free quote without any obligation.
Bifolding doors can be made from timber, engineered timber, aluminium or PVC-U. Timber systems can be very attractive, but are prone to warping and can be difficult to maintain. Entirely PVC-U systems may not have the structural rigidity required for larger installations. Aluminium is widely regarded as the best option, being strong and lightweight. If you have existing PVC-U glazing at home, Integral is a great choice. It has the fundamental strength of aluminium but is designed to match with leading PVC-U systems.
Yes. These can be easily accommodated.
Integral works with double and triple-glazed units. PVC-U beads suit 24, 28, 36, 40 or 44mm units, and the aluminium bead suits 28mm units.
Thermal performance is variable depending upon the configuration and choice of glass.
Example values are as follows:
- U-value 1.7W/m2K with 1.2 Ug glass
- U-value 1.6W/m2K with 1.1 Ug glass
- U-value 1.1W/m2K with 0.5 Ug glass
- The maximum width is 6.3 metres. Up to 7 leaves are possible with individual leaf sizes ranging from 700mm to 900mm. 6463mm (6.463 metres) including frame.
- The maximum height is 2100mm. 2200mm (2.2 metres) including frame but no cill.
- The maximum leaf weight including glass is 120kg. 100kg per sash (or leaf).
Note that for large installations or hard to access locations there is an option of crimped or mechanically jointed frames for easy transportation.
The doors are designed for internal glazing and are directly compatible with Profile 22, Spectus and Swish 70mm window and door systems and ancillaries.
Externally, the frame and sash upstand are bevelled, but there is a square sash upstand alternative. Internally, the profiles can be sculptured or bevelled with PVC-U beads or square with aluminium beads.
Standard colours in matt powder-coated finish include Signal White, Anthracite Grey and Jet Black and any RAL colour is available to order. A full range of (Renolit) foils allows complete consistency with coloured or woodgrain PVC-U windows.
No. The traffic or access door can be positioned where the customer wants according to the opening configurations.
Multiple layout options are possible with any arrangement of up to seven leaves, which can be inwards or outwards opening. Left, right and both-sides stacking are possible as is any access door position.
Integral is a PAS 24 accredited system and can meet Secured by Design standards. It’s also capable of achieving the Approved Document Q requirements.
Integral’s ability to match both existing and new PVC-U systems is a clear advantage. Homeowners like the styling, affordability and easy maintenance of PVC-U windows, and now, they can have all the benefits of a bifold in a door that doesn’t look out of character. Our range includes up to 28 foiled finishes so consistency of aesthetics is never a problem.
Using PVC-U beads makes glazing easier and more cost effective and we have a wide range of glazing options – from 24mm to 44mm. In addition, Integral incorporates a double hinge fixing for strength and reliability.
Integral offers all the strength and reliability of an aluminium bifolding door system alongside the option of PVC-U detail. This enables a great match with other PVC-U glazing in a property, whether existing or new. For some people, the aesthetics of other aluminium systems are too harsh for their architecture or taste. Integral solves this problem at a stroke.
Unlike many bifolding door systems, Integral uses both Aluminium and PVC-U components. The name Integral reflects the idea that the two materials complement each other to make the best possible whole bifold system.