TRUSS CONNECTIONS

  • HIP ENDS

The details shown here are for a maximum design wind of 50 m/s (non-cyclonic). Refer to AS 4440-2004 for full details including up to 74 m/s cyclonic.

The hip end connections provided by IDomain   Build software are similar to those in AS4440-2004, but they may not be exactly the same, as every connection is designed specifically for the conditions at each site.

The requirements called up by IDomain   Build take precedence over AS4440 or any other guideline. A document (Software Update No. 7) is available to produce to certifiers if required.

CONNECTION DETAILS – HIP-END TRUSSES FOR WIND CLASSIFICATION N1, N2, N3 OR C1

(Refer AS4440 for details in N4, C2 or C3)

  • GIRDERS

Where a girder truss is utilised to support the standard trusses perpendicular to it, they must be connected to the girder with special devices which:

  • Support the loads.
  • Prevent separation of the girder bottom chord away from the standard trusses.
  • Multi-ply or single ply girder truss

For bolting details, refer to IDomain   specifications

Standard truss 

Tension strap to restrain bottom chord twist

Truss boot

5.4 VALLEYS

Where truss spacing is greater than roof batten centres in sheet roof sheet jobs, intermediate top chord ties may be required. Check with the truss manufacturer.

Supporting truss top chord

Min. 35 x 45 Steel ledge or block fixed to top chord for roof pitches greater than 15 deg.

One effective 65 mm skew nail driven through valley truss bottom chord into

supporting truss top chord. Alternatively, one Multigrip without Steel ledge

(for roof pitches greater than 15 deg.). Note: two Multigrip may be required for any roof pitch in high wind regions.

Valley truss

STANDARD TRUSS BOOT AND ANTI-TWIST BAR

  • Main Girders

Supported trusses may be fixed to the girder truss by IDomain  products. The truss manufacturer will generally supply the appropriate bracket for each connection, or otherwise specify. It is important to fix the truss boot properly, ie, including fixing to incoming trusses, prior to roof being loaded. Otherwise bottom chord rotation can occur.

Heavy Duty Truss Boot Standard Truss Boot

  • Dutch Hip Girders

The waling plate must be fixed to the Dutch hip girder truss in accordance with the details supplied by the truss manufacturer.

Refer to truss layout or detail sheet for fixing requirement, using nails or screws (typical)

Waling Plate

DUTCH HIP GIRDER FITTED WITH WALING PLATE

5.3 GABLE-END TRUSSES

Installation Guidelines for Steel Roof Trusses (to be read in conjunction with AS4440-2004) September 2016 11

 

FIXING DETAILS FOR VALLEY TRUSSES

  • OVERHANGS

It is important that overhangs are supported as intended by the truss designer. Refer to AS4440-2004 for full details.

  • Strutted Overhangs (Boxed Eaves)

Strutted overhang

Struts at hip corners and other areas must be fixed in accordance with the details supplied by the truss manufacturer.

  • Verge Overhangs

Non-structural

block BLOCK

OUTRIGGERS

ZED SPROCKETS