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A tie bar is a systemised set of tubular elements that provide a connection between the bottom chords of roof trusses on a duo-pitch roof span. This system prevents the roof from spreading under large downward loads. When laced effectively, it also provides additional resistance against uplift forces. It may be considered for projects requiring a large span, projects subject to heavy snow loads or downward wind loads, or projects with limited tying possibilities.
This is very much subject to a variety of factors, including but not limited to:
• Location
• Environmental loads.
• Duration of project.
• Bay size.
• Support structure.
In moderate climate and exposure the following maximum spans can be expected:
• 450 series – in excess of 20m.
• 750/780 series – in excess of 30m.
• Asterix HD – in excess of 50m.
A 15 degree inclination allows water to run off the roof without excessive water depot build up, avoiding water ponding and ingress in to the sheet tracking. Use of DeepFlow™ tracking allows for roof pitches to be made shallower and has been proven on spans pitched at 10 degrees.
Based on 2.5m bays UNI Roof is 8-10kg/m2 and Asterix HD is 13-15kg/m2.
Yes. A quicker alternative is to use DESSA bracing elements.
It is recommended that no taller than a 2.5m standard should be used on a UNI shelter.
Providing a four hole connection will result in the joint governing the strength of the overall beam. Therefore the capacity of the D78 beam will be reduced. Details of the reductions are shown in our technical information sheet TIS17001.
No. According to EN 12811-1, cl. 4.2.2.1, alloy tubes should not be connected to if their thickness is less than 4mm. The posts of the D78 beam are less than this. Full guidance on where to connect puncheons across our full beam range is shown in Beam User Guide USG001.
For standards of 48.3mm diameter, quick release pins AF0001 can be used. These pins are designed to suit a 12mm hole with 48.3mm outer diameter tube.
Yes. Care should be taken to pack and store the sheets following use. They should be inspected for damage, dried and pan folded with no sharp creases. We recommend they are stored in bags and inside.
