Steel Joist Sizes And Spans

Rafter and joist span faq.

Steel joist sizes and spans. Kcs joists lh series and dlh series sections 100 105 joist girders sections 1000 1006 sji code of standard practice 134 for joists and joist girders sections 1 8 referenced specifications codes and standards glossary fire resistance ratings with steel joists 149 osha safety standards for steel erection 158 deck design guide 169 economical guide. Copy of the listing agency report. While most residential construction uses 2x8 joists with 16 inch spacing there are many other factors you need to consider when determining the proper joist span length. The spans are based on simple span joists.

Joist centres joist single span joist continuous span table 1 maximum floor joist span m boxspan section single span continuous span cantilevered span floor joist centres mm 400 450 600 400 450 600 400 450 600 b100 12 2 48 2 39 2 17 2 77 2 50 2 27 1 33 1 28 1 03 b100 16 2 73 2 63 2 39 3 03 2 78 2 53 1 46 1 40 1 27. For example you can span a 1 grade no knots southern yellow pine a greater distance than a 2 grade with knots southern yellow pine. The minimum bearing length is 1 spans values in bold indicate that web stiffeners are required at the osb end panel. Web crippling calculation and indicate if web stiffening is required g.

Of bearings and is based on uniformly loaded joists. Actual height or span of stud or joist f. The lengths and sizes of joists vary depending on the species and quality of the lumber used. When building a house or even a deck it is important to confirm you have the correct joist sizes spans and spacing before you get started.

Dead load deflection is limited to l 360 and total load deflection is limited to l 240. The maximum span is measured o c. Open web steel joists are an engineered truss like construction component used to support loads over short and long spans alike. This sample table gives minimum floor joist sizes for joists spaced at 16 inches and 24 inches on center o c for 2 grade lumber with 10 pounds per square foot of dead load and 40 pounds of live load which is typical of normal residential construction.

True floor joist span calculations can only be made by a structural engineer or contractor. I e icc es ul etc 1. For example a 25 span would be 25x12 20 15. Steel construction rules of thumb floors beams and girders to calculate the necessary depth of a beam divide the span in inches by 20.

Steel joists joist girders. The width of this beam would be between 1 3 and the depth. Joist span and spacing is set by your local building code. Typically used in non residential construction steel joists and joist girders provide an economical system for supporting floors and roofs.