How To Make 2x4 Floor Trusses

Raised floor living in conjunction with southern forest products association developed a table to help understand how trusses are built.

How to make 2x4 floor trusses.

Step 1 lay the two pieces of 2 by 4 by 144 inch lumber on a worktable. Bottom chord bearing bottom chord bearing trimmable ends top chord bearing and mid block bearing are all available. Trusses are beneficial in that the open spaces in the middle make it easy to run utilities through them. Maximum floor joist span for no.

Maximum deflection is limited by l 360 or l 480 under live load. Use of manufactured roof trusses can dramatically cut labor costs when framing a gable roof compared to building rafters. Floor trusses offer four different bearing conditions for a wider variety of uses. Most spans are typically 10 to 12 feet so we typically use 2x8 or 2x10.

Dead load weight of structure and fixed loads 10 lbs ft 2. Live load is weight of furniture wind snow and more. There are online span calculators available that tell you the maximum span for. Spacing of trusses are center to center in inches.

Open web floor trusses are constructed with 2x4 boards on the top and bottom with a web of diagonal boards in the middle secured with metal plates. 2 grade of douglas fir are indicated below. Basic lumber design values are f 2000 psi f 1100 psi f 2000 psi e 1 800 000 psi duration of load 1 00. I joists offer only one bearing.

1 ft 0 3048 m. Fink trusses were originally invented for the purpose of beefing up bridges but many contractors now use them to increase the strength of interior structures. Build a fink truss to bolster a floor roof or deck. Floor truss span tables alpine engineered products 17 these allowable spans are based on nds 91.

The depth or height of your floor joists depends on how far they can span without sagging. While they flex more than i joists they flex less than lumber trusses and use less wood. The multiple bearing conditions make matching existing floor heights much easier when using floor trusses.