Depth Of Floor Trusses

This also reduces the need and cost for extra bearing posts beams and footings.

Depth of floor trusses.

Geometry loading spacing bearing conditions etc. Dead load weight of structure and fixed loads 10 lbs ft 2. 2 grade of douglas fir are indicated below. 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. Floors 18 encyclopedia of trusses maximum duct dimensions are based on a truss plate width of 4 inches. Live load is weight of furniture wind snow and more. Click to add item 18 x 8 trimmable end floor truss to the compare list.

Maximum floor joist span for no. May duct openings for fan style floor trusses with 4x2 or 3x2 chords webs all dimensions in inches depth. When making a selection below to narrow your results down each selection made will reload the page to display the desired results. Roof floor truss manual 7 31.

Chase sizes are maximum possible for centered openings. Span tables below illustrate common combinations of the multiple variables available. Floor trusses can span farther between bearing points than i joists allowing for larger open rooms. True floor joist span calculations can only be made by a structural engineer or contractor.

Floor trusses have built in openings which can be used to install hvac ductwork plumbing lines and electrical wiring. 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. 11 1 4 inch 7 14 inch 10. 1 ft 0 3048 m.

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. Larger plate widths cause a reduction in duct sizes.