Roof Purlin Deflection Criteria

For example the allowable deflection of a 12ft span floor joist with plaster l 360 is 0 4 12ft divided by 360.

Roof purlin deflection criteria.

1x skip sheathing is. Plaster or gypsum board. Z section purlins 10 c section trimmer 51 side rails 28 7 metsec uk leaders in the design and manufacture of engineered and bespoke purlin and side rail building solutions. Roof sheathing is at least 7 16 thick oriented strand board or plywood.

Mean roof height is not greater than 40 feet. Top running crane trc beams. Table r301 7 allowable deflection of structural members. Monorail crane mr beams.

Dead load will be the actual weight of the roof steel and the roof purlins. Other than plaster or gypsum board. Other than plaster or gypsum board. Plaster or gypsum board.

Roof rafters roof joists and roof beams. The cos of the purlin spacing is because the load on the purlins is vertical and the purlin spacing is with the run of the roof. 3 mezzanine beams and joists. Therefore a purlin should be adequately strong to withstand the loads it will encounter during its design life and should not sag in an obvious manner thereby giving the roof sheeting an undulating and or unpleasant appearance.

Underhung crane uhc beams. This post will be focusing on design of steel purlin using cold formed sections. The attached list of criteria is met. Floor beams floor joists and floor decking.

Allowable deflection as an expressed ratio of the clear span.