Composite bifold door photo

SUNFLEX

Composite bifold doors

The natural beauty of timber or high performance of aluminium? With composite bifold doors, you can enjoy both. It's the perfect marriage of timber-clad frames indoors and low-maintenance aluminium outdoors.

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SUNFLEX SF75c Composite bifold doors from IDSystems

A great choice for traditional properties or adding character to new builds and extensions, these SUNFLEX composite bifold door systems provide the ideal combination of hard-wearing aluminium to the outside and solid timber cladding to the inside.

These highly engineered SUNFLEX timber-clad aluminium bifold doors are manufactured for us exclusively in Germany. They are available in a choice of timbers, profiles and finishes to match the style of your room.

Innovation from IDSystems

Timber clad aluminium bifold doors

Unlike other composite folding doors, the SUNFLEX SF55c and SF75c systems are aluminium doors with internal timber cladding (rather than timber systems with external aluminium fascia) and share all the same design features and innovation of the award-winning SF55s and SF75 systems.

Two systems, one design

The SUNFLEX SF55c and SF75c bifold doors share significant manufacturing and design characteristics including tracks, sight lines, finishes, weather performance and unique features. Where they differ is in their thermal performance with the SF75c designed specifically to accommodate a triple glazed unit and capable of achieving an industry-leading low U-value of just 0.9W/m2K.

Secured by Design logo

High security

Security is of paramount importance and, as with all of our bifold doors, the SUNFLEX SF55c and SF75c systems hold the coveted Secured by Design Award. The scheme aims to reduce crime by ensuring the effective design and installation of products to meet police-approved security standards.

Timber choices for SUNFLEX composite bifold doors

Customised timber cladding

SUNFLEX SF55c and SF75c composite bifold doors are available with a range of timber types, cladding styles and finishes to suit almost any project. Select from Nordic Pine, Meranti, American White Oak, Larch or Douglas Fir and then choose a timber cladding style and finish to complete personalise your doors.

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Smooth operator

All SUNFLEX bifold doors are fitted with unique running carriages that mount to the door frame rather than the hinge. This provides the smoothest operation, enhanced security and neat visual appearance.

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Ten-year warranty

The superior quality of our products, combined with the high standards of our installation team, enable us to offer a full ten-year warranty* on our systems and workmanship. The IDSystems' guarantee is also fully transferable if you decide to sell your home.

*Exclusions apply, please contact us for full details of warranty policy.

Unlike other composite doors on the market where timber doors are clad with aluminium, the structure of SUNFLEX composite doors is aluminium with a section of timber cladding attached to the inner face of the door, so they are not susceptible to warping, twisting or rotting.

The bifold door panels can be made up to 1200mm (SF55c) or 1100mm (SF75c) wide and 3500mm high, width the maximum overall panel size dictated by the glass specification and the weight of the sealed unit.

Our range of SUNFLEX composite timber and aluminium bifold doors

SUNFLEX SF55c

Hugely popular composite timber-clad aluminium bifold doors

The SUNFLEX SF55c bifold door has a thermally broken aluminium frame on the outside to match your windows, and a timber cladding inside to match the look of your room. You can enjoy the benefits of low-maintenance aluminium and the natural beauty of wood in aluminium bifold doors.

SUNFLEX SF75c

Advanced ultra-thermally efficient timber-clad aluminium bifold doors

Continuing on from the success of the SF75, the SUNFLEX SF75c has evolved to offer the best in thermal efficiency – an extremely low U-Value eco-friendly bifold door system. This market-leading system provides the lowest in CO2 emissions associated with reduced energy consumption and considerable savings in heating bills.

Sight lines (intermediate frame widths)

Having narrow sight lines maximises the view. Our composite bifold doors have 118mm sightlines, fractionally wider than the 115mm of the SF55s and SF75 aluminium systems because of the internal timber cladding.

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SUNFLEX SF55c

118mm

SUNFLEX SF75c

118mm

Frame depths

The internal timber cladding adds 20mm to the inside face of the aluminium door frame, increasing the frame depth compared to the SF55s and SF75 systems

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SUNFLEX SF55c

75mm

SUNFLEX SF75c

95mm

Timber choices

We offer a choice of timber for the internal cladding of the composite systems.
Standard - Meranti is a durable hard wood whilst Nordic Pine is a knot-free softwood.
Optional - American White Oak, Larch or Douglas Fir

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SUNFLEX SF55c

2 standard (Meranti or Nordic Pine) plus 3 optional (American White Oak, Larch and Douglas Fir) choices

SUNFLEX SF75c

2 standard (Meranti or Nordic Pine) plus 3 optional (American White Oak, Larch and Douglas Fir) choices

Cladding styles

Choose a style of cladding to match the internal finishes of your project. The Moulded profile provides a more intricate detail, the Traditional profile offers a nicely curved finish or the Squared profile is a clean contemporary design.

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SUNFLEX SF55c

3 - Moulded, Traditional or Squared

SUNFLEX SF75c

3 - Moulded, Traditional or Squared

Internal timber finishes

Choose from a wide range of Sikkens™ wood stains, with the choice of having different stains or even paint finishes available for interior and exterior surfaces also available.

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SUNFLEX SF55c

Range of stains, paint or oiled (oak only) finishes

SUNFLEX SF75c

Range of stains, paint or oiled (oak only) finishes

External frame colours

The external frames of our composite doors are available in a range of standard colours, alternatively you can select from an almost infinite choice of optional colours and finishes.

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SUNFLEX SF55c

Standard – Anthracite Grey (RAL 7016) semi-gloss, White Aluminium (RAL 9006) semi-gloss, Grey Aluminium (RAL 9007) semi-gloss, Traffic White (RAL 9016) semi-gloss and Anodised Silver. Optional - More than 200 RAL colours and finishes are available as an optional extra

SUNFLEX SF75c

Standard – Anthracite Grey (RAL 7016) semi-gloss, White Aluminium (RAL 9006) semi-gloss, Grey Aluminium (RAL 9007) semi-gloss, Traffic White (RAL 9016) semi-gloss and Anodised Silver. Optional - More than 200 RAL colours and finishes are available as an optional extra

Thermal performance

Thermal performance of the doors is measured as a U-value. When comparing products it is crucial to compare the overall U-value of the system and not just the U-value of the sealed glass unit.

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SUNFLEX SF55c

Double glazed: from 1.6W/m²K

SUNFLEX SF75c

Triple glazed: from 0.9W/m²K

Panel sizes

Because our composite doors are made from an aluminium frame (rather than timber) our panel sizes are the largest of any composite door system on the market.

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SUNFLEX SF55c

Width: up to 1200mm. Height: up to 3500mm

SUNFLEX SF75c

Width: up to 1100mm. Height: up to 3500mm

Opening direction

Whilst the majority of bifold doors are installed in an outward opening configuration, inward opening doors are ideal for use with balconies or with small courtyard gardens.

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SUNFLEX SF55c

Inwards or outwards opening, stacking to one end

SUNFLEX SF75c

Inwards or outwards opening, stacking to one end

Gaskets

The gaskets that seal the panels of the doors together when closed, providing a weather-tight seal, are made from an incredibly durable, synthetic EPDM rubber.

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SUNFLEX SF55c

Continuous triple rebated gaskets

SUNFLEX SF75c

Continuous triple rebated gaskets

Thermal break

Separating the external and internal aluminium frames of the door the polyamide thermal breaks prevent cold bridging, increasing the thermal performance of the system.

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SUNFLEX SF55c

Patented 24mm polyamide thermal break

SUNFLEX SF75c

Patented 44mm multi-chambered polyamide thermal break

Security

Our bifold doors include shoot bolt locks that extend from the lead door and intermediate panels into the top and bottom of the track, whilst the lead door features a mushroom head lock into the side jamb.

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SUNFLEX SF55c

Multipoint locking with shoot bolts hidden in the top and bottom of the door panels and mushroom head lock on lead door.

SUNFLEX SF75c

Multipoint locking with shoot bolts hidden in the top and bottom of the door panels and mushroom head lock on lead door.

BSI Kitemark™

Independently certified for quality assurance to prestigious BSI Kitemark™ standards.

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SUNFLEX SF55c

Yes. Certificate No. 643635

SUNFLEX SF75c

Yes. Certificate No. 643635

PAS 24:2016 / Building Regulations Document Q compliant

PAS 24:2016 is the testing standard for security required to comply with Building Regulations Document Q. P1a glass (usually laminated glass) specification is required to meet Building Regulations Document Q approval.

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SUNFLEX SF55c

Yes

SUNFLEX SF75c

Yes

Secured by Design

The Secured by Design award marks the police preferred security specification for windows and doors

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SUNFLEX SF55c

Yes

SUNFLEX SF75c

Yes

Glazing options

Double glazing is a minimum requirement for external doors and windows. Our standard double glazed units consist of a soft-coat Low-E (low emissivity) pane and argon gas-filled cavity which provides a centre pane U-Value of 1.2W/m2K. Over the standard, we can provide super-insulated double glazed units providing a centre pane U-Value of 1.0W/m2K whilst providing solar control.

Triple glazing is becoming increasingly popular, especially in total new builds, as it provides the lowest U-Values possible and can be up to 40% more efficient than double glazing. Combining two panes of Low-E glass and two gas-filled cavities, glazing U-Values as low as 0.5W/m2K are possible with the added benefit of great sound reduction.

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SUNFLEX SF55c

Double glazed as standard

SUNFLEX SF75c

Triple glazed as standard

Severe weather rating

Every set of doors and windows undergoes independent physical testing to assess the ability of the systems to withstand air and water. Water tightness is tested against BS EN 12208 standard with air permeability tested against BS EN 12207 standard.

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SUNFLEX SF55c

Water tightness: 900Pa (Class 9a). Air permeability: 600Pa (Class 3)

SUNFLEX SF75c

Water tightness: 900Pa (Class 9a). Air permeability: 600Pa (Class 3)

Track options

Our bifold doors come with a choice of track options. Non-weather rated flush tracks are only typically recommended for internal or sheltered urban locations. Low-threshold tracks have 14mm upstands are ideal for urban or rural locations, with our fully weathered tracks designed for rural or exposed locations.

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SUNFLEX SF55c

3 – flush, low-threshold or weathered track

SUNFLEX SF75c

2 – low-threshold or weathered track

Locking panel catch

A truly unique and innovative feature, the SUNFLEX locking panel catch holds the lead door of the system in place when the doors are being opened, preventing the door from swinging shut.

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SUNFLEX SF55c

Yes

SUNFLEX SF75c

Yes

Stacking clip

Unique to SUNFLEX bifold doors, the exclusive stacking clip holds the doors securely in place when they are stacked open, stopping the wind (or young children) closing the doors unexpectedly.

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SUNFLEX SF55c

Yes

SUNFLEX SF75c

Yes

Running gear

The running gear of our composite bifold doors are designed to offer effortless operation, however large the panels and however wide the opening.

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SUNFLEX SF55c

Concealed stainless steel running gear connected to the frame of the doors

SUNFLEX SF75c

Concealed stainless steel running gear connected to the frame of the doors

Moveable corner posts

The integration of a moveable corner post allows the doors to open up a complete, unobstructed corner of a room

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SUNFLEX SF55c

Yes, for 90° or 135° corners

SUNFLEX SF75c

Yes, for 90° or 135° corners

Integral blinds

We are able to fit integral Venetian blinds within the glazed unit, ensuring a totally dust-free environment which requires no cleaning or maintenance. These are very popular, especially on internally opening systems where curtains are not practical.

Integrated blinds can be tilted to help prevent the build-up of excessive heat and glare of the sun during the daytime and provide privacy when closed. Blind units are manually operated with an ingenious magnetic control device.

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SUNFLEX SF55c

Optional

SUNFLEX SF75c

Optional

Trickle vents

The requirement for trickle vents to provide background ventilation can be a requirement of Building Regulations Document F, depending on the type of project you are undertaking. IDSystems trickle vents are installed through the head track of the outer frame if required.

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SUNFLEX SF55c

Optional

SUNFLEX SF75c

Optional

Glass coatings

Tinted anti-sun glass: Reducing solar gain, available in blue, green, grey or bronze.
Neutral anti-sun glass: Neutral in colour with reflective properties to reduce solar gain.
Self-cleaning glass: Reduces the need to clean the glass, very useful in roofs.
Obscure glass: Our satin deco is a stylish solution for areas requiring privacy.
Low-iron glass: Improves the light transmittance through the glass while providing some free energy.

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SUNFLEX SF55c

Options available: Tinted anti-sun glass, Neutral anti-sun glass, Self-cleaning glass, Obscure glass and Low-iron glass

SUNFLEX SF75c

Options available: Tinted anti-sun glass, Neutral anti-sun glass, Self-cleaning glass, Obscure glass and Low-iron glass

Glass type

For new-build homes or for change of use projects (barn conversions etc) we fit laminated glass as standard to meet the requirement for P1a glass as specified by Building Regulations Document Q for security. For all other projects (extensions, replacements or renovations etc) we fit toughened glass to comply with Building Regulations Document N.

Toughened glass
Toughened glass has been heat tempered to increasing its strength over ordinary annealed glass by up to five times. Other than the strength the advantage of toughened glass is that should it break it would shatter into non-sharp pieces. It is also available with the widest variety of coatings and can be supplied in larger sheets than equivalent thickness laminated glass.

When the glass is toughened it can suffer from some visual distortion making, meaning the face of the glass is not perfectly flat distorting some reflections.

Laminated glass
Laminated glass is manufactured by bonding two panes of annealed glass with a clear plastic interlayer. The benefit of laminated glass is that if it’s broken the glass will crack rather than shattering, improving security. In addition, laminated glass reduces bleaching of carpets, curtains and furniture by filtering UV rays that would usually penetrate the glass.

The drawback of laminated glass is that extreme heat or cold can cause invisible defects in the glass to form a crack due to the two panes expanding and contracting independently. As the laminated glass is not toughened is does not suffer from the visual distortion that can occur to toughened glass during the toughening process.

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SUNFLEX SF55c

Toughened or laminated glass

SUNFLEX SF75c

Toughened or laminated glass

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