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.
Floor truss weight.
And parallel to floor truss span strongback lateral supports 24 max.
Maximum deflection is limited by l 360 or l 480 under live load.
24 truss 120 150 30 160 200 36 220 300 40 270 350 50 375 500 60 450 600 70 600 800 80 800 1000.
With an evenly distributed live load of 30 psf which the tables show the floor is able to support the total weight on the floor would be about 3 360 pounds.
Geometry loading spacing bearing conditions etc.
Increasing the total weight on the floor to 4 480 pounds however results in a live load of 40 psf which is beyond the floor s load capacity.
Basic lumber design values are f 2000 psi f 1100 psi f 2000 psi e 1 800 000 psi duration of load 1 00.
An 18 inch deep truss 22 feet long is used in the floor of an office project.
The floor assembly consists of linoleum tile over a hydronic floor heating system with 1 inch light weight concrete assume hydronic heating system weight of the lightweight concrete it replaces and inch plywood subflooring.
Roof floor truss manual 7 31 08 10 43 am page 12.
Floor truss span chart each individual floor truss design is unique based on multiple variables.
For example a properly designed office floor can support 50 pounds per square foot.
Plated floor trusses are very heavy present a handling danger because of sharp plate edges and plates often interfere with the installation of mechanicals.
My truss weight table per single truss.
The live loads a truss is required to bear are determined by local building codes.
This also reduces the need and cost for extra bearing posts beams and footings.
Steel is also a non renewable resource manufactured with great energy consumption.
Regardless of truss span or truss weight use common sense when lifting the trusses into place.
How much weight can a floor support.
Spacing of trusses are center to center in inches.
Floor truss span tables alpine engineered products 17 these allowable spans are based on nds 91.
Span tables below illustrate common combinations of the multiple variables available.
If the bottom chord of a roof truss functions as a floor joist such as in an attic room it carries a live load that also varies by use but a typical live floor load for a residential space is about 40 pounds per square foot.
Floor trusses can span farther between bearing points than i joists allowing for larger open rooms.
This is a common question asked by facility managers when contemplating a new file system or a heavy equipment addition.
