Obviously I don't want it to collapse, but I also don't want to spend more on materials than I need to. I have been welding for about 15 years and am confident in my welding ability, I am just not really sure what size material I need for this. That would be 6 guys at 200lbs plus 800 lbs of desk, furniture, etc. I figure the maximum weight up there spread over the whole area will be 2000 lbs. A span options calculator allows selection of multiple species and grades for comparison purposes. Click for STRUCTURAL DESIGN CALCULATIONS. 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. Is this sufficient? What size of purlins are required to span this 10'? 3", 4" ? Joists and rafter spans for common loading conditions can be determined. Surveyors’ span tables for designing roof rafters for pitched roofs, flat roofs and ceiling joists. I am thinking of using 3/4" plywood for the floor and spacing the purlins 2' apart. Roof rafter size and thickness shall be determined in accordance with the limits set forth in Table R804.3.2.1(1) based on the horizontal projection of the roof rafter span. I am needing to weld some more purlins in there to span this 10' gap and to attach the floor to. The purlins are parallel and 10 feet apart. The following diagrams and tables illustrate the sizes and thicknesses readily available for purlins and girts. Maybe a small table on one end for poker night with the buddies.Īnyway right now I have 10" C purlins ran across the length of the shop that I am going to build the floor on. Nothing fancy just a desk, and a warm clean space to work on stuff. This new edition of The Span Book includes added tables for deck joists and beams, more lintel options, and recalculates all spans using revised shear properties. It is going to be 10 feet wide by 30 feet long. I built a steel building that is tall and I am wanting to add a second floor in it for a sort of office for me.
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