Web Ties and Stiffeners for Roof Trusses Some truss designs require longitudinal ties, stiffeners or other supplementary members to be applied to webs. Where longitudinal ties are used, they should be 70 x 35, or as specified by the truss fabricator. Where longitudinal ties are used, they should be continuous and fixed to web of each truss at mid-height with 2 x 3.75 dia. Nails and braced back to truss with one bay of crossed Speedbrace at each end and intermediate bay at 10m centres. Ties may be spliced by lapping over 2 adjacent trusses.   Web stiffeners may be specified in lieu of web ties where it is difficult to fit web ties because of the small number of trusses or the carrying position of the webs. Eg. Truncated trusses and hip trusses.   Web stiffeners may be timber sections fitted on-site or steel Eliminator stiffeners fixed during manufacture. Where timber stiffeners are used these should be the size and grade specified by the truss designer and should be continuous for the full length of the web.