Roof Truss Design Five things to keep in mind when designing Roof Trusses are: Trusses are designed for normal roof, ceiling and wind loads to suit specific jobs and conditions. Additional loading such as Solar Units, Hot Water Tanks, Air Conditioning, etc. require special consideration. Wall frames and beams supporting trusses must be designed for the correct roof loads. Wind load is an important factor in the design and performance of roof trusses. Ensure that you have correctly advised the truss fabricator with regard to wind load requirements and that adequate provision has been made to fix trusses to the support structure to withstand wind uplift forces. Trusses are generally designed to be supported on the outer wall with inner walls being non load bearing. Where it is necessary to use internal walls for load bearing, these will be clearly shown on layouts. Before ordering trusses, ensure that your particular requirements have been provided for and that all relevant information has been supplied to the truss manufacturer. If non standard trusses are being used, ensure that erection and bracing details are known before erection commences. For environments where the atmosphere may be conducive to corrosion, such as near some types of industrial and agricultural buildings, or buildings near the ocean and subject to salt spray, consideration should be given to the use of G8S stainless steel connector plates.