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Timber Bifold Doors

Technical Details

Hardwood bifold doors

timber sashTimber folding sliding doors are manufactured from hardwood harvested from sustainable sources. Our standard hardwood profiles are Eucalyptus which are spliced into three sections and then glued together under high pressure with the grains running in opposing directions. Laminating the timber in this way helps to prevent twisting and distortion.  European oak is available at additional cost.


timber panelsUsing modern technology the panels are cramped squarely and all timber joints are bonded under pressure using polyurethane adhesive often used in aircraft construction. Polyurethane adhesive becomes harder in a moist environment which allows us to guarantee the structural integrity of these doors for a full ten years*

*Subject to minor routine maintenance


Technical Data

FD2U timber bifold doors are suitable for all locations including coastal regions and can be fitted as external or internal doors.


Minimum Panel Width 500mm
Maximum Panel Width 1000mm
Maximum Overall Door Height 2500mm



Technical DetailsOur timber folding doors have slim sight lines as you can see in this image.  The visible sight line between the glass for this style where all three panels fold and slide in the same direction is just 150mm.  Some door styles may require additional meeting stiles which will widen the sightline.  For more information on sight lines download CAD drawings for all profiles.


Download CAD Drawings


Low Threshold Option

Our hardwood bi-folding doors are supplied with a 52mm high aluminium threshold and 45mm of this can be sunk into the floor to create a flush threshold.  This is especially useful for internal doors or for external folding doors where decking or a patio is required to be at the same level as the internal floor.  Other threshold options are also available including an external projecting cill.

Flush Track


Concealed Running Gear

aluminium trackAll the running gear is concealed with the aluminium head and threshold profiles and panels run on maintenance free stainless steel wheel carriages in top and bottom tracks that operate quietly and smoothly to ensure ease of operation.  The enclosed track system also ensures that the doors cannot be lifted from the track when the door is closed and locked.


High Security Hinges

Our hardwood folding sliding doors are fitted with high security hinges to prevent the pins being removed and the hinge being forced from the door. The right hand image shows the hinge roller carriages fitted to top and bottom of sliding panels with the left hand image showing inner hinge arrangement.  Hinge fixings on both types are only accessible when the door is open unlike some systems that use face-fixed hinges. Standard hinge colour is black but bronze anodised and brushed nickel are available options.

brushed nickel hinge brushed nickel roller hinge D Handle
Brushed Nickel Hinge Brushed Nickel Roller Hinge Brushed Nickel D Handle


High Security Locking Systems

door lockTraffic doors on our hardwood bifolding doors are fitted with hardened steel multi-point high security hook bolts, shoot bolts and dead bolts as standard.  Intermediate panels are secured by internal handle operated shoot bolts that locate into the top and bottom of the track.

security lever handleTraffic doors with external locking are supplied with a high security key cylinder designed to prevent the cylinder from being snapped or pulled in order to force entry.  The cylinder is supplied with three keys as standard and a unique bar code that must be used to order additional keys preventing keys from being easily copied.


Internal Fold Flat Handles

The intermediate panels are fitted with internal fold flat handles shown on the right that allow the operation of the shoot bolt locking system whilst folding flat to allow panels to stack neatly against each other when the door is fully open.

Handle colour choices are gold, chrome, brushed nickel or black.

black handle nickel handle
Black Handle Brushed Nickel Handle
gold handle chrome handle 
Gold Handle  Chrome Handle 


High Performance Weather Rating

panel sealOur timber bi-folding doors feature twin rubber EPDM weatherseals on each side of each panel and high performance weather seals at the top and bottom of each panel to ensure the high performance of the door.

A sample door has been tested at a UKAS accredited testing station and passed the PAS23 weather test to extreme weather conditions of over 300 pascals.


A Rated for Thermally Efficiency

All our bi folding doors are designed to minimise heat loss from your property and have been tested for their thermal efficiency.

energy ratingThe thermal rating of any material is currently measured in U value which records heat loss through the product. The lower the U value the greater the insulation value of the product.

Timber is a natural insulator and is one of the most thermally efficient building materials available. When glazed with our Staycool double glazing our timber folding door achieves an exceptionally low 1.4 U value.

Tests have also been simulated under BFRC criteria which confirm that our hardwood and softwood bifold doors achieve an A rating.


Staycool Energy Efficient Double Glazing

Staycool logoOur hardwood bifold doors are now supplied with STAYCOOL double glazing as standard providing an exceptionally low 1.0 U-value ensuring maximum heat retention during the colder months of the year. STAYCOOL also provides solar control benefits for the summer reducing glare by 35% and solar heat reflection of 57% protecting your home and furnishings.

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