Metal Roof Rafter Span Tables

Span tables all span tables.

Metal roof rafter span tables.

Usually 400 450 or 600mm but any value can be used up to 610mm max. This is set by the roof use you selected in the previous screen and cannot be modified. 2020 steel beam s install support solved a simply supported steel beam beam and block load span tables floor to beam es esgram single span roof beamsolved a simply supported steel beam. Gable walls need to be strapped to the roof at the maximum 2m centres using 30 x 5m galvanised mild steel straps.

Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run. The imposed uniformly distributed live load in the main span. These span tables apply only to flat roof and roof with a slope of up to 10 degrees. The span tables have been prepared for attached 1 side and free standing 4 sides open or 3 sides open 1 enclosed sides pitched roofs that are empty under 50 blocking in accordance with as nzs 1170 2 2011 requirements.

Loads are calculated in accordance with table 3 1 of as nzs 1170 1 2002. Click here for structural design calculations. Timber to be covered these span tables do not apply to timber which is fully exposed to the elements. Rafter spans for southern yellow pine douglas fir and eastern spruce.

Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch. Span tables for ceiling joists to bs 5268 7 3 span tables for flat roof joists to bs 5268 7 2 imposed loads of 0 75 kn m for maintenance and snow load are applicable where there is no permanent access no fixed ladder or staircase and most areas where the altitude does not exceed 100 metres refer to bs 6399 3. This is the distance between rafter centres. Surveyors span tables for designing roof rafters for pitched roofs flat roofs and ceiling joists surveyors and structural engineers utilise data from tables below to help calculate the correct size strength and centres of roof timbers for the required spans and loadings.

Design of single span rafters in roofs in houses office buidlings schools and other structures. Imposed loads roof snow load and short term point load. Notches are not to exceed 0 125 of the depth of the joist and are to be located between 0 07 and 0 25 of the span from the support. Plasterboard on the underside of the rafter.