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)
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:
For bolting details, refer to IDomain specifications
Tension strap to restrain bottom chord twist
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.
STANDARD TRUSS BOOT AND ANTI-TWIST BAR
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
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)
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
It is important that overhangs are supported as intended by the truss designer. Refer to AS4440-2004 for full details.
Struts at hip corners and other areas must be fixed in accordance with the details supplied by the truss manufacturer.