Fixing Roof Trusses to Top Plate INTERNAL OR NON-LOAD BEARING WALLS (a) Non Bracing Wall   If the internal or non-load bearing walls are not designed as bracing walls, fix the truss with the internal wall bracket with nails at the top of the slit to allow for Roof Truss settlement as it is loaded. Brackets are fixed at 1.8m centres along unsupported sections of the wall. Where trusses are parallel to walls, trim between the bottom chords and fix brackets to the trimmer. Where non-load-bearing walls are stable in their own right, no Internal Wall Brackets are required.   (b) Bracing Wall   Where internal walls are non-load bearing but are designed as bracing walls, trusses should be fixed to the top plate using structural connections of equivalent strength to the bracing strength of that particular bracing wall. The connection should also allow the truss to deflect vertically when it is loaded.   (c) Non Load Bearing External Wall   Where non-loadbearing external walls, such as veranda walls where trusses are pitched off veranda beams or other beams, the top plate of the wall should be stabilized at a maximum 3000 mm centres. Fixing Roof Trusses to Girder Trusses Special Girder Brackets are available for supporting standard trusses on the bottom chords of Girder Trusses. These brackets should be fully fixed in accordance with details supplied by the truss fabricator prior to loading roof. Fixing Roof Trusses to Multiple Ply Trusses Multiple ply trusses are required to be joined in accordance with the following recommendations to comply with design assumptions.   STANDARD TRUNCATED AND HIP TRUSSES Double Truss (nail one side only)   Join all chords and webs with nails or screws staggered one side only.   Triple Truss (nail both sides with bolts at panel points)   Join outer trusses to centre truss using the double truss details. In addition, join trusses at each panel point with one M12 bolt.   GIRDER AND DUTCH HIP TRUSSES   Nail as for standard roof trusses, except maximum nail or screw centres to be 300mm to all chords and webs. Waling Plates to be fixed to each chord and web with bolts or screws. Where Press-On Girder Brackets are used, join bottom chord with one M12 bolt or 2 screws located within 100mm of each Girder Bracket.