Timber Floor Joist Centres

The floor joist spacing is the distance between the centers of any two installed joists.

Timber floor joist centres. This is the distance between joist centres. All the figures are based on normal domestic. Rule floorboards should be a minimum 16mm thick for joist centres up to 500mm and 19mm minimum for centres up to 600mm. This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance.

Our floor joist span tables are based on loadings given in the newer amended version of bs 6399 1. See the image below for an example of joists spaced 16 on center 16 o c. Span tables for domestic floor joists to bs 5268 7 1 note. True floor joist span calculations can only be made by a structural engineer or contractor.

In this instance the maximum span between deck post centres is 2 07m c16 or 2 24m c24. Usually 400 450 or 600mm but any value can be used up to 610mm max usually 400 450 or 600mm but any value can be used up to 610mm max 1 2 timber strength class and joist size. Since the example house we are designing for is 12 feet wide we need to find in the floor joist span table a joist size and centering that can span 12 or wider. Materials and workmanship and bs 5268 7 1 1990 structural use of timber section 7 1 domestic floor joists.

The following table gives details of allowable spans and spacing between joists for the most common timber sizes used in floor construction. 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. We recommend beams are constructed from two 44 x 145mm q deck deck joists and are placed at maximum centres of 1 8m. Joist and deck board spacing guidance.

This is the distance between joist centres. Centre to centre spacing of joists in mm joist size width depth mm 400 450. 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. Usually 400 450 or 600mm but any value can be used up to 610mm max usually 400 450 or 600mm but any value can be used up to 610mm max 1 2 timber strength class and joist size.