Timber Floor Joist Spans

The following table gives details of allowable spans and spacing between joists for the most common timber sizes used in floor construction.

Timber floor joist spans.

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Also available for the android os. Simplified span tables for southern pine lumber and glued laminated timber glulam headers beams and girders. Engineered wood products ewp span and size charts for bci joists.

All the figures are based on normal domestic floor loadings where the floor construction is typically 18 25mm floor boards sheets with up to 12 5mm thick plasterboard and skim underneath. Span calculator for wood joists and rafters also available for the android os. For example a joist made from doubled 2 x 6s can span a distance about 25 percent more than a single 2 x 6 but a 2 x 12 can span about 80 percent more than a 2 x 6 even though it has the same amount of wood as a doubled 2 x 6. View joist rafter tables.

1 psf lb f ft 2 47 88 n m 2. A few of the most common factors that affect joist span include. For example you can span a 1 grade no knots southern yellow pine a greater distance than a 2 grade with knots southern yellow pine. Timber building products manufactured for outdoor use in all.

The lengths and sizes of joists vary depending on the species and quality of the lumber used. Live load 30 lbs ft 2 1436 n m 2. View size selection tables. Maximum span of 2x12 floor joist the most important design choices to consider when building a home are the species and grade of wood that is being used as well as joist size and spacing.

The width is considerably more important than the thickness of a board. Live load is weight of furniture wind snow and more. 1 ft 0 3048 m. Bci joists are specially constructed i joists with flanges made from strong versa lam laminated veneer lumber with oriented stranded board webs and approved waterproof structural adhesives providing outstanding strength and durability.

2 grade of douglas fir are indicated below. As the name trimjoist indicates our product can be trimmed on the construction site for a custom fit. These elements will greatly affect how far you can span your joists. Maximum floor joist span for no.

Dead load weight of structure and fixed loads 10 lbs ft 2. Trimjoist is the marriage of an open web floor truss and a trimmable wooden i joist bringing the best features of each to the relationship. 1 in 25 4 mm. View allowable load tables.