Welcome to Tru-Bilt Industries Ltd
Tru-Bilt Industries Ltd, also known as ‘The Dock and Door Company that cares’, is a family owned
and operated business with only one objective in mind—”To manufacture and supply you
with high quality products and cost effective solutions for all your door and loading dock
needs. With a comprehensive range of associated products Tru-Bilt Industries Ltd is here
to help you make the right choice every time.”
Tru-Bilt Industries Ltd is pleased to present to you our Tru-Fold™ catalogue. Our selection of high
quality product combined with years of experience and industry knowledge has produced the
most extensive catalogue ever published by Tru-Bilt Industries Ltd.
Throughout this catalogue, you’ll find our range of Tru-Fold™ presented in an informative and
easy-to-use manner. At the end of the catalogue you’ll also find product technical data, giving
information on sizes, clearances, power supply requirements and other important details.
Tru-Bilt Industries Ltd, being an all-round market leader in the industry, also offers an exceptional
dispatch and delivery system, taking care of all your transportation logistic worries. The doors are
packed in a volume saving manner, dispatched to site and all ready for installation.
And remember, we’re only a phone call or email away!
Every effort has been made to ensure accuracy and the most up-to-date information in the compilation of this catalogue. However, Tru-Bilt
Industries Ltd does not accept responsibility for any inaccuracy or errors contained herein. Information and values presented are intended
only as a guide to performance and application suitability. Nothing herein contained constitutes a warranty that any product is specifically
suitable for a particular purpose. Tru-Bilt Industries Ltd will not accept any liability for product failure or ineffectiveness due to disrespect of
manufacturer recommendations. Tru-Bilt Industries Ltd reserves the right to change product design and specifications without notice.
All product designs are subject to copyright and cannot be copied in whole or in part. Tru-Bilt® is a registered trade name.
Tru-Fold™ Folding Doors
Tru-Fold™ Folding Doors
Tru-Fold™ Folding Doors offer you a dynamic solution for your heavy duty door requirements. When
you need a heavy duty door with easy operation, durability, strength and a door system to last many
years, Tru-Fold™ is your only solution. Tru-Fold™ is available up to 10m high and 30m wide in one
door, totally eliminating the need for centre mullions and multiple doors for your wide door solutions.
Standard colour steel cladding gives a quality pre-finish exterior with the main frame constructed
from zinc coated steel. Applications for your Tru-Fold™ have been used in airport hangars, schools,
workshops, factories, government departments, supermarkets and industrial buildings.
Durable Rugged Design
Cladding options Wide spans (no centre mullions
or weight on lintel)
Strong construction No floor tracks (no bumps
(no rattly roller doors) or rubbish traps)
Cost Effective Low Maintenance
“Closed” “Half Open” “Open”
Frame construction on all Tru-Fold™ doors
are from galvanised steel. All construction
is from experienced engineers taking pride
in their work. With both quality steel and
workmanship, Tru-Fold™ doors will outlast any
door on the market.
Don’t watch your step as there are no floor
tracks as on sliding doors. This gives excellent
transition as there is nothing to trip over or
drive over. Excellent in industrial or hangar
No horizontal, internal tracks. As seen in the
photo, making the internal finish very tidy
when your door is shut.
Ease of operation is achieved by the doors
being counter-weighed. If the door weighs
1000kg. 1000kg of weights are used making
this the easiest door on the market to operate.
Hand chain unit can be added to any door. This
can be mounted on either side of the door.
Motor operation gives you total control of
your door. With a built-in emergency over-ride,
you will never be left “in the dark.” Motor can
be mounted on either side of door. Motor units
come standard with remote activation.
Cladding options for Tru-Fold™ doors are endless. 90% of doors are clad with a roofing profile due to
cost and ease of installation. Shown are some of the many completed projects. Weight and thickness
can be an issue, but submit your ideas and we will work with you. Horizontal cladding can add extra
“Zincalume Cladding” “Coloursteel Cladding”
“Powder Coated Flat Sheet” “Coloursteel Sheeting”
“Fully Glazed” “Half Glazed, Half Coloursteel”
Tru-Fold™ doors add no weight to the lintel, no tracks to the floor and no wing walls to the outside
edge of your building. The over all door is easy to install and very easy to operate. A large single
span door can be opened manually or with a motor option. The example below is based on a door
estimated at 600kg.
Sliding doors need wing walls, therefore the hangers
take up extra space. Hangers can’t be close together,
150kg 300kg 150kg
Centre mullions sag lintels and add unnecessary
weight to structures.
Tru-Fold™ transfer the door weight down into the floor.
Tru-Fold™ construction surpasses every other type of door on the market. All the doors are made to
withstand a minimum of 0.85kpa and can also be constructed to meet any wind load. Shown in the
photos below are the two most common types of truss configuration, lattice and purlin. The type of
truss used on each door is determined on door width and cladding.
“Lattice Type Truss”
“Purlin Type Truss”
Shown is a project with a row of hangars at a small airfield. There is also another lot of hangars on the
back of these three. On a building 15.0m wide, the 13.0m wide door allows you to have a man door
next to Tru-Fold™ door as seen in the photos below. The doors are manually operated.
3.6 High x 13.0m wide
Shown is a large door in the coal mining industry. The site is at 1000m above sea level and faces
huge winds. The door was retro fitted to an existing building and has been a huge success. Other
types of doors have been blown in, but the Tru-Fold™ door has come out on top. A motor fitted,
makes it 100% operator friendly.
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Shown is a huge door for a helicopter maintenance company. Glass on the top 3/4 gives excellent
natural light into the workshop offering an excellent working environment. With a trackless floor, the
conveyance of helicopters for test flights becomes effortless. With the simple push of a button, the
huge 132m2 door quietly lifts up out of the way.
6.0m high x 22.0m wide
Shown is a Tru-Fold™ on a new tyre retailer. There were two doors with the front door having glazing
to the bottom panel only. This gives the benefit of excellent lighting with protection from wind and
rain. (Note - horizontal cladding may add additional costs)
4.0m high x 10.0m wide
Every Tru-Fold™ door is packaged in the best possible way for ease of freight and to minimise
damage. From small doors to large doors they are all able to be transported using standard trucks
and containers. In most cases there are two pallets. One the same length as the tracks with all the
tracks, counter weights etc and one with the trusses or purlins.
Small doors ready for transport Full container load of doors
Installation is very important with the Tru-Fold™ door. A good product can very quickly become a
headache product due to poor installation. The procedure is much the same on all doors regardless
of the size and can easily be undertaken by knowledgeable tradesman. The crane below is lifting the
door into position with the top part clad already. All doors have installation instructions provided and
we also offer on-site assistance, to first time installers.
Installation of a 8.0H x 16.0w door using a crane. Installation of a purlin type door being lifted in
(lattice type truss) with a fork truck.
Easy to Install Low Maintenance
Install with Basic Tools
Travel Arc: Travel arc shown below is indicative for all Tru-Fold™ doors. Welded trusses are shown but
on some doors, other types of trusses are used.
A = Door height divided by 4
Note: Welded truss shown in drawing above
Elevation Dimensions (nominal)
A = 300mm (side room)
B = 150mm (track fixing)
C = 350mm (head room)
D = 1/4 of door height
Daylight Opening E = up to 500mm
Height F = up to 15.0m wide
(Less door thickness) 400mm
up to 20.0m wide
up to 25.0m wide
up to 30.0m wide
A B 900mm
Daylight Opening Width
A Plan B
15mm clearance 15mm clearance
(Nominal) Cladding (Nominal)
C Door open
15mm clearance supplied
Travel Arc Floor
Door Openings Formed and finished by others. Must be true and plumb. No obstructions such as electrical
conduits, steel plates or services to be inside fixing areas. Contact Tru-Bilt Industries Ltd to
ensure that you have the right interpretation of the above information.
Track Fixing Options
Flat fixing space round door must be provided. The details below out-line some of the possible ways
and some of the different types of fixing.
The Slab Concrete Rolled Purlin
Use galvanised fixing into concrete. Bolt through the purlin. Do not tex
Ensure concrete edge doesn’t crack. screw on. Timber can be set in the
back and coach screwed into.
Timber Steel Beam
Use coach screws only. Timber tex Weld or bolt on. Fixing must be
screws are not suitable. provided for cover.
Note: Track fixing is important. Wind load is transformed back to the tracks and then into the structure.
Structural strength of building to be by a engineer. Tru-Bilt Industries Ltd takes no responsibility for
what the door is fixed to.
Dimensional View: The 3 dimensional view indicates door structure configured inside the door
“Door Half Open”
Note: Door shown with one row of glass and man door. Welded trusses for high wind area. Detail not
applicable on all doors.
Wind Speed Table
Below is a table of wind calculations
Pressure (kPa) Speed (m/sec) Speed (km/h)
0.45 27 98
0.60 32 113
0.85 38 135
1.00 41 146
1.15 44 157
1.30 47 167
1.45 49 176
1.60 52 185
1.75 54 194
1.90 56 202
Product Title: Tru-Fold™ Folding Door by Tru-Bilt Industries Ltd
Operation: Two leaves with a horizontal folding line. Both leaves are counter weighted and under
constant suspension. Both leaves guided by wheels in the track.
Frame: Side styles to be of heavy RHS to suit wind loads applicable. Galvanised steel to be used
where possible. No less than grade C350LO in accordance with AS/NZ 4600. Where purlins are used,
in accordance with AS/NZ 1397:1993. Galvanising to be a minimum of 275g/m2. un-coated steel to
be coated to a grade 4 finish to suit application.
Wire Ropes: Galvanised wire to be used in all situations. Safety factor of 6-1 to be applied in all
Tracks: Constructed using galvanised steel where possible. Coatings and steel grade to be equivalent
of specifications for frame. To suit applicable wind and cladding loads. Fixing of tracks to wall/
structure by welding or bolting. Fixing is site dependent. Concrete to be thicker under tracks to take
door weight. 100mm per 2.0m of door height is minimum. Track must sit on floor.
Counter Weights: To be of cast iron blocks @7.4kgs each. Weights to be equal weight to door,
suspended on heavy duty frame with heavy duty pulley mounted on top.
Counter Weight Covers: Formed from galvanised sheet to applicable length. Finished size will vary
due to counter weight details. Must be removable for ease of maintenance. Protect with one bollard
Seals: Clear PVC type seal for complete perimeter of door. Fix between frame and cladding. Seal to
touch frame and the concrete floor provides bird proof surrounding.
Cladding: Client specified. Must be fixed in accordance with all local/governing bodies codes. Glass
to be in accordance with overhead glazing codes. Horizontal cladding may add extra costs to door
structure. Use vertical cladding where possible.
Man Doors: Can be incorporated into certain designs. Sizes to be determined by cladding and frame
Activation: Doors can all be manually operated. Hand chain or motors can be installed. Hand chain
to have a 4.5-1 ratio mounted in galvanised enclosure. Motor to be 1ph or 3ph depending on door
size and weight. Motor to have emergency override feature and be capable of incorporating remotes
and other activations. Power to be supplied to door by owner/contractor. Provide isolating switch at
1500mm from the floor.
Locking: Manual doors to have standard door bolts on each side of door. Slide bolts to slide into
16mm0 hole in concrete floor. Hand chain and motorised doors to have no locks. Locking by
Windloading: All doors to be designed to withstand 0.85 kpa/37.64 metres per second/135 kmh
winds. Structure for door tracks to be fixed to is to be engineered by others. Wind loads are transferred
onto the axles in the centre of each leaf. Windloading in some cases to be site specific.
Tru-Bilt Industries Ltd
586 Kaikorai Valley Road, Dunedin, 9001, New Zealand
Email: firstname.lastname@example.org • www.tru-bilt.co.nz
Phone: +64 3 488 2060 • Fax +64 3 488 2061 • Freephone 0800 144 999 (NZ)