Timber Floor Joist Spans

Span calculator for wood joists and rafters also available for the android os.

Timber floor joist spans. Internal floor joists f7 42mm 30 deck joists f7 42mm 31 deck bearers f7 32. 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. 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. 1 in 25 4 mm.

The following table gives details of allowable spans and spacing between joists for the most common timber sizes used in floor construction. 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. These elements will greatly affect how far you can span your joists.

Span tables f7 rafters a maximum roof pitch of 25 degrees is assumed. View allowable load tables. Live load is weight of furniture wind snow and more. 2 grade of douglas fir are indicated below.

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. No more custom made floor trusses. The lengths and sizes of joists vary depending on the species and quality of the lumber used. Dead load weight of structure and fixed loads 10 lbs ft 2.

Engineered wood products ewp span and size charts for bci joists. Maximum floor joist span for no. 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. The width is considerably more important than the thickness of a board.

View size selection tables. Simplified span tables for southern pine lumber and glued laminated timber glulam headers beams and girders. A few of the most common factors that affect joist span include. As the name trimjoist indicates our product can be trimmed on the construction site for a custom fit.

Also available for the android os. 1 psf lb f ft 2 47 88 n m 2. Timber building products manufactured for outdoor use in all. Live load 30 lbs ft 2 1436 n m 2.