Timber Floor Joist Load Tables

Where the tables do not apply or where there are concentrated loads floor joists should be designed by an engineer in accordance with technical requirement r5.

Timber floor joist load tables. Timber floor joists shall be adequate for the spans and loads and be correctly installed. These span tables assume installation of at least three joists or rafters that are spaced not more than 24 on center. Span tables f7 rafters a maximum roof pitch of 25 degrees is assumed. Simplified span tables for southern pine lumber and glued laminated timber glulam headers beams and girders.

Builders can adjust their choice of lumber size and spacing depending on circumstances. Also available for the android os. View joist rafter tables. This sample table gives minimum floor joist sizes for joists spaced at 16 inches and 24 inches on center o c for 2 grade lumber with 10 pounds per square foot of dead load and 40 pounds of live load which is typical of normal residential construction.

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Technical diagram on page 35 30mm m aximum allow able sp ans mm sheet roof. For example in the joist span table below the highlighted cell shows that 2 x 8 southern yellow pine joists that have a grade of 2 and are spaced 24 apart can have a maximum span of 10 feet 3 inches 10 3 if designing for a live load of 40 lbs ft 2. View allowable load tables.

Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. The calculated spans assume fully supported members properly sheathed and nailed on the top edge of the joist or rafter. Apa performance rated i joists pris are manufactured in accordance with pri 400 performance standard for apa ews i joists form x720 this performance standard provides an easy to use table of allowable spans for applications in residential floor construction allowing designers and builders to select and use i joists from various member manufacturers using just one set of span. Internal floor joists f7 42mm 30 deck joists f7 42mm 31 deck bearers f7 32 deck bearers gl8 32.

Solid timber joist sizes are provided in the bs 8103 3 span tables. Span calculator for wood joists and rafters also available for the android os. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Imposed loads of 1 kn m for maintenance and snow load are applicable where there is no permanent access no fixed ladder or staircase and most areas where the altitude.

View size selection tables. Imposed loads of 0 75 kn m for maintenance and snow load are applicable where there is no permanent access no fixed ladder or staircase and most areas where the altitude does not exceed 100 metres refer to bs 6399 3.