Spacing For Floor Trusses

Floor trusses can span farther between bearing points than i joists allowing for larger open rooms.

Spacing for floor trusses. Trusses must be designed for any special loading such as concentrated loads. This means from the center of one upright joist to the center of the next. Spacing of trusses are center to center in inches. Floor truss span chart each individual floor truss design is unique based on multiple variables.

Span tables below illustrate common combinations of the multiple variables available. Stiffness and strength can be designed into the floor truss creating a more solid floor. We hope the floor trusses will make the process easier down the line running plumbing and ductwork and electricity through the spacing. Ultra span trusses are developed using our steel engine software that calculates the right amount of steel for your floor to give you all the strength you need but minimize the amount of cold formed steel used.

Other floor and roof loading conditions a variety of species and other lumber grades are available. Occasionally however the trusses might sit 19 2 inches or 24. 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. This also reduces the need and cost for extra bearing posts beams and footings.

Almost all joist manufacturers provide joist span spacing depth info for different floor deflections l 360 l 480 etc. Typically the layout calls for spacing the trusses 16 inches apart measured from the center of one truss to the center of the next. The spacing of floor trusses allows for maximum structural efficiency and speed of installation. Center line chase 24 max.

Shrinkage warping or twisting are minimized. With some structures floor joists are required to be 12 or 24 inches apart on center. I also strongly recommend an open web truss joist. Floor trusses have built in openings which can be used to install hvac ductwork plumbing lines and electrical wiring.

Top chord dead load 10 psf. Tcll 40 psf tcll 80 psf tcll 125 psf truss spacing truss spacing truss spacing. Special bearing cantilever and balcony details are easily built in. Normally floor joists are spaced 16 inches apart on center.

Typical minimum acceptable floor deflection is l 360. However i recommend specifying l 480 for a stiffer floor required for tile. But since the trusses are wider that other more traditional options it did cause changes. True floor joist span calculations can only be made by a structural engineer or contractor.