High Load Easy Fix Girder Bracket



Steel girder brackets for easy fixing of timber roof trusses or rafters to the girder trusses or timber beams.

These pre-punched and formed galvanised steel girder brackets are:

  • Ideal for supporting timber roof trusses or rafters in high wind areas.
  • Available in two sizes – 40mm to suit 35 or 38mm timber thickness, and 50mm to suit 45mm or 47mm timber thickness.


Mark on the girder bottom chord (120mm minimum) the location of all girder brackets and hangers.  Position the High Load Girder Bracket against the bottom of the girder bottom chord and apply Multinail Black Tip #14 screws.  Black Tip #14 screws must be applied until the underside of the screw head is against the Girder Bracket.

Do Not overtighten the screws or use power drills that are too powerful for the job as this may damage the timber, screws or bracket.

Step 1

Fix 12/25mm Black Tip #14 screws (6 per wing) to the girder truss.
Double Truss – Use 65mm long Black Tip #14 screws to fix to the double girder trusses.
Triple Truss – Use 100mm long Black Tip #14 screws to fix to the triple girder trusses.

Step 2

Fix 12/25mm Black Tip #14 screws (6 per side) to the supported truss to ensure that the uplift and anti-rotation features of the Girder Bracket is maintained.


  • The High Load Girder Bracket is only provided with structural adequacy certificate when used with Black Tip #14 screws.
  • Roof provides diagrams and details of the Girder Bracket type and positioning.


  • Multinail recommends the use of roofing screw drivers to fix screws.
  • Black Tip #14 screws self drill through 1mm plates.
  • It is recommended that the Black Tip #14 screws are applied in one action.
  • When screwing into hardwood, holes should be pre-drilled for 65mm and 100 mm long screws.
  • Supported truss to be hard into girder truss.
  • All screws to be inserted prior to roof truss being loaded to avoid rotation.


Dead Load Dead Load +Live Load Dead Load + Wind Load
J2/JD3 14.8kN 20.0kN 29.1kN
J3/JD4 10.4kN 14.0kN 20.7kN
J4/JD5 7.3kN 10.0kN 14.8kN

NOTES: The uplift in capacities are derived from AS1720-2010 and are for houses where failure is unlikely to affect an area greater than 25m2.  For primary elements in structures other than houses or elements in a house for which failure would be greater than 25m2 these capacities must be multiplied by 0.94.  For primary joints in essential services or post disaster buildings multiply by 0.88.


Manufactured from 1.9mm Galvanised G450 Z275 Steel

Product Code Size Carton Quantity Carton Kg.
TA227 40mm 12 12.1
TA228 50mm 12 12.1
Note: Must order appropriate quantity of Black Tip #14 screws.
25mm Black Tip #14 Screw (TA233), 65mm Black Tip #14 Screw (TA235),
100mm Black Tip #14 Screw (TA237)

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