Floor Joist Truss Design

Our custom designed floor truss systems reduce the amount of bounce that can be found in conventionally framed floor joist systems.

Floor joist truss design. Tb 120 engineer s seal requirements for i joists scl and plated trusses. Floor trusses have built in openings which can be used to install hvac ductwork plumbing lines and electrical wiring. See all 47 articles code requirements. The floor joist spacing is the distance between the centers of any two installed joists.

Center line chase 24 max. See all 7 articles beams and columns. Basic lumber design values are f 2000 psi f 1100 psi f 2000 psi e 1 800 000 psi duration of load 1 00. Trusses must be designed for any special loading such as concentrated loads.

This reduces the need for interior bearing and provides space for hvac plumbing and electrical systems within the floor panels. What is allowable deflection. 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. What is live load ll.

What is dead load dl. Geometry loading spacing bearing conditions etc. Top chord dead load 10 psf. Floor truss span chart each individual floor truss design is unique based on multiple variables.

Floor trusses are able to span farther than dimensional lumber and even i joists. Spacing of trusses are center to center in inches. Since the example house we are designing for is 12 feet wide we need to find in the floor joist span table a joist size and centering that can span 12 or wider. Bottom chord dead load 5 psf.

Span tables below illustrate common combinations of the multiple variables available. See the image below for an example of joists spaced 16 on center 16 o c. Section aa floor truss jacks floor joist scab cantilever floor cantilevered perpendicular and parallel to floor truss span strongback lateral supports 24 max. Trus joist tji joists are a key part of making a high performance floor.

The dimensional stability of tji joists help them resist warping twisting and shrinking that can lead to squeaky floors. Custom built floor trusses allow building designers to add extra loading for in floor heat heavy tile floors heavy kitchen islands quartz countertops and high traffic areas. You can use the links below to navigate throughout the guide. Info about duration of load.