Floor Joist Sizing Uk

The table excerpt above is simply a sample and may not be valid for your region.

Floor joist sizing uk. The following table gives details of allowable spans and spacing between joists for the most common timber sizes used in floor construction. Joists are to have minimum end bearing of 40mm. Looking at this table you will see there is a choice in the size of floor joist 2 x 6 2 x 8 2 x 10 or 2 x 12 and there is a choice in the joist spacing 12 16 or 14. When building a house or even a deck it is important to confirm you have the correct joist sizes spans and spacing before you get started.

Choosing the correct floor joist size depends on your building application joist spacing and several other factors these include the length of the span as well as the type and grade of the lumber being used. 1 2 timber strength class and joist size automatically calculate sizes suitable for supporting the loads below c16 cost effective for most applications c24 stronger more demanding c14 c18 c22 c27 c30 c35 c40. 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. These tables can help calculate whether floor joists are strong enough to support themselves and the load they carry without the help of any walls underneath.

Though joists may be any size that you desire using typical floor joist and beam specifications ensures that you can find hardware to fit the joists and that the floor provides adequate support for furniture and other items in a room. Surveyors and structural engineers use data from tables below to help calculate the size of timbers necessary to give adequate support to timber floors. Common joist spacings are 12 inches 304 8 mm 16 inches 406 4 mm and 24 inches 609 6 mm. Floor joists or beams provide the below surface support for the wood subfloor of a room.

While most residential construction uses 2x8 joists with 16 inch spacing there are many other factors you need to consider when determining the proper joist span length. Traditionally this material was sold in sawn sizes such as 4 x 2 or 47mm x 100mm now days the uk market is used to offering this material regularised ie it has smooth planed eased edges making it easier to work with and. Joist span and spacing is set by your local building code. A 2 8 will provide a few additional benefits and have some advantages but overall the 2 6 is the most commonly used and budget friendly option for constructing your shed floor.

What size floor joist do i need. 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.