Timber Frame Floor Joists

I joists are the most common way to structurally frame an upper floor in a residential building.

Timber frame floor joists.

Timber floor joists shall be adequate for the spans and loads and be correctly installed. At donaldson timber engineering we design and cut all of our i joist flooring systems using metsawood s finnjoists. Dead load weight of structure and fixed loads 10 lbs ft 2. What materials are used in beam and joist floors.

Solid timber joist sizes are provided in the bs 8103 3 span tables. The material most commonly used for residential floors using beams and joists is timber although steel frame homes are becoming increasingly popular. You ll use the same size lumber to assemble the rim joists as you will for the main floor joists. So the area one floor joist will have to support is 2 wide half way to the one next to it on either side and 16 long less the long sills which are 8 x10.

1 ft 0 3048 m. 1 psf lb f ft 2 47 88 n m 2. The following table gives details of allowable spans and spacing between joists for the most common timber sizes used in floor construction. Timber frame joists purlins.

Timber purlins and joists form the roof and floor framing in timber framed buildings. Live load is weight of furniture wind snow and more. For most jobs 2 in 5 1 cm x 10 in 25 cm boards are an ideal size. I joists are also commonly used in flat roofs for both residential and commercial buildings.

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. The old school way to do the joinery is to dovetail them in. Maximum floor joist span for no. It is a strong joint that lasts over time.

So 192 less 16 or 176 of un supported span. Uk structures are a leading supplier of timber frame structures floor joists and roof trusses. Before any project is undertaken we ensure our clients have a full understanding of the step by step construction process uk structures will provide from preliminary site inspections through to project completion sign off. Unfortunately the beautiful dovetail is hidden in the finished building but its strength and integrity is not.

176 is 14 8 x 2 for square feet 29 34 sqft. Times 75 lbs 2200 5 lbs on one floor joist. The rim joist sits vertically on top of the sill plate along the outside of the frame to create a lip for the main floor joists.