Depth Of Floor Trusses

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.

Depth of floor trusses.

When making a selection below to narrow your results down each selection made will reload the page to display the desired results. Floor joists are made from 2 by 8 inch or 2 by 10 inch lumber or from engineered quiet beams which are made from a thin layer of chipboard on edge between two lumber caps forming an i shape. Live load is weight of furniture wind snow and more. 2 grade of douglas fir are indicated below.

Floor truss span chart each individual floor truss design is unique based on multiple variables. Click to add item 18 x 8 trimmable end floor truss to the compare list. Floor trusses have built in openings which can be used to install hvac ductwork plumbing lines and electrical wiring. Geometry loading spacing bearing conditions etc.

This also reduces the need and cost for extra bearing posts beams and footings. True floor joist span calculations can only be made by a structural engineer or contractor. Floor joist scab cantilever floor cantilevered perpendicular and parallel to floor truss span strongback lateral supports 24 max. 72 5 0 mi ni m u m girder floor truss floor truss jacks a a bearing wall girder floor truss floor truss jacks bearing wall cantilevered floor truss two 2x rim joists 24 max.

Span tables below illustrate common combinations of the multiple variables available. Larger plate widths cause a reduction in duct sizes. Chase sizes are maximum possible for centered openings. Maximum floor joist span for no.

11 1 4 inch 7 14 inch 10. Floors 18 encyclopedia of trusses maximum duct dimensions are based on a truss plate width of 4 inches. 1 psf lb f ft 2 47 88 n m 2. Floor trusses can span farther between bearing points than i joists allowing for larger open rooms.

Roof floor truss manual 7 31. 1 ft 0 3048 m.