Floor Joist Trada Span Tables

The floor joist span tables are based on the loadings given in the amended version of bs 6399 1 which is an imposed load of either a uniformly distributed load of 1 5 kn m or a concentrated load of 1 4 kn.

Floor joist trada span tables. Floor joist span tables for surveyors floor construction. Span tables for solid timber joists tables 1 and 2 in this chapter are derived from the trada technology ltd. See the notes below the span tables for details. Eurocode 5 span tables for solid timber members in floors ceilings and.

True floor joist span calculations can only be made by a structural engineer or contractor. Now in its 4th edition the trada span tables publication is a must for any designer or builder. Span tables for solid timber floor joists. Use of these span tables requires reference to the applicable design values for the various species and grades of lumber.

Other span tables are based on the guidance given in bs 5268 7 1 which is a uniformly distributed load of 1 5kn m for spans greater than. Easy to look up tables allow the reader to choose the size of solid softwood timber members necessary to give adequate support to floors ceilings and roofs in dwellings. Tables 1 and 2 in this appendix are derived from a trada technology ltd. Publication span tables for solid timber members in floors ceilings and roofs excluding trussed rafter roofs for dwellings.

Span tables for domestic floor joists to bs 5268 7 1 note. Joist span table use these tables to determine floor joist spans based on grade of lumber size of joist floor joist spacing and a live load of 30 lbs ft 2 or 40 lbs ft 2 these tables can also be used to determine deck joist span. Our floor joist span tables are based on loadings given in the newer amended version of bs 6399 1. The section sizes of the floor joists given in tables 1 and 2 should be regularised or be als or cls.

Where the joists span over 2 5m strutting is required to prevent joists twisting when loaded. 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. See a 1 3 for 2 span floor joist requirements. For spans of between 2 5 and 4 5 m one row of strutting is needed at the mid span position.

If your old joists do not meet the requirements set by the table they are either supported. 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. You need to measure the complete span of your floor joists together with the distance between them the centres and the size of the timbers. Tables w 1 and w 2 of design values for joists and rafters a supplement to these span tables.

For spans in excess of 4 5 m two rows of strutting will be required positioned at the one third and two third span positions. Eurocode 5 span tables.