Builders Information

Thank you for your interest in Bradworthy Bi Folds.

The information below has been gained through our wide variety of experience over the years of building and installing Bradworthy Bi fold doors.

Call us on 9555 1255

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General Information

  • Typical Bi-Folding hardware allows each panel
    a maximum width 1m,
    maximum number of panels 7 each way
    max height 2.7m,
    max panel weight 40kg
    So your clients may want to go to town and open up quite a distance.
    We can build them, the hardwear certainly allows it but, be careful to ensure the house frame can accommodate the unbraced area. Do not rely on the roof. We know of circumstances where the builder needed to spend a lot more time and effort bracing a roof because of the bi fold area his house plan opened up.
  • Depending on the house, in most circumstances it is not practical to open up more than 4.8m anyway but if the client wants the bi fold look all the way through a room, them we advise placing bi fold look-alikes  at both ends where a TV or table my be placed.
  • For room divider applications, this system can be used internally deleting the bottom track.
  • This system requires a supportive structure capable of taking the weight, as all doors are top hung. Depending on widths it is advisable to insure the jamb studs and subfloor is strengthened (under the jamb studs). Try to keep a stump under the stud a bi fold jamb is fixed to. Do not underestimate the weight of the doors when moving and the weight when  projected out past the frame. Make sure the supportive structure is capable of supporting the doors.
  • Lay your roof before you install bi folds.
  • Make sure the head trimer we fix to, is fixed securely to the lintel  via hoop iron or long screws.
  • Always allow 15-20mm gap at the bi fold head to enable the head section to be raised if any foundation/frame movement occurs during construction. Check to make sure the bi fold head is straight before fixing plaster etc.
  • We recommend the inside floor be the same  level as the external deck or paving etc.
  • Try and sit our sill on the  joists then run both internal floor and ex decking up to our sill, however, if external paving is being used and water can hit the doors it is advisable to sit our sill on top of your internal floor and external paving allowing the bottom channel’s weep holes to vent the water safely.
  • Always seal the doors with 2 coats before installing.
  • Each Bradworthy Bifod comes with a maintenance guide detailing the correct cleaning procedures to prevent hard ware deterioration, a guide relating to cleaning frequency due to environmental conditions  and also a painting or staining schedule, detailing exactly what’s been done and what has to be done and the products used to insure optimum life expectancy.

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Panel sizes

Maximum Panel width including a door handle = 820mm
Minimum Panel width 410mm

Maximum Panel width excluding a door handle = 920mm
(a door handle fitted to a door over 820 wide is not recommended)

Weather Penetration

Bradwworthy Bifolds are suitable for use in external building applications. The seals used with this system resist wind, rain and significantly reduce noise transmissions.

Noise omissions

Standard glass used 6.38 Laminated
By using 6.38 Laminated Glass traffic noise is reduced by 24%
and voice noise reduced by 13%
By using 10.38 Laminated Glass traffic noise is reduced by 45%
and voice noise reduced by 29%
Laminated glass reduces UV ray penetration

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Maximum Frame Sizes

Maximum frame height 2.8m
Maximum frame width 5.8m

How easy is it to adjust the doors?

Bradworthy Bi folds use pivots at the jamb which allow adjustment of the system both horizontally and vertically. Intermediate carriers also have vertical adjustment.
You will find adjusting your doors very easy by placing your foot under the door and slightly lifting  while adjusting.
Please view our maintenance page.


Bradworthy bi folds uses Western Red Cedar for all doors and frames with Merbau for Bi Fold sills, architectural grade aluminium alloy for the top tracks and polypropylene floor channel, stainless steel for hinges, hinge pins, carrier pins and carrier bogeys.

Sill Dimensions

Merbau   135mm width x 56mm  high
Copper tube at 1 metre intervals drilled through our merbau sill vents the water build up in the bottom track so it is not advised to design external paving eg: Concrete, concrete tiles etc  butting up to our sill at the same level as  this prevents water escaping from our bottom track. Timber decking is fine providing the decking allows the copper tube to vent water build up (doesn’t but up hard to our copper vent)
A concrete tile can be used externally providing our bi fold sill sits on top of the tile to allow the copper tube to operate.

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Stile Dimensions

WRC  135mm width  x 55mm  Weather board construction or 170mm for Brick Veneer construction

Head Section

WRC 135mm width  x 94mm

Head Fix

Our Bi fold head requires a fixing point  –  93mm out  from your  finished plaster edge.

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