Timber Frame Floor Joists

The material most commonly used for residential floors using beams and joists is timber although steel frame homes are becoming increasingly popular.

Timber frame floor joists.

The old school way to do the joinery is to dovetail them in. Dead load weight of structure and fixed loads 10 lbs ft 2. I joists are also commonly used in flat roofs for both residential and commercial buildings. Timber frame joists purlins.

At donaldson timber engineering we design and cut all of our i joist flooring systems using metsawood s finnjoists. Times 75 lbs 2200 5 lbs on one floor joist. 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 following table gives details of allowable spans and spacing between joists for the most common timber sizes used in floor construction.

I joists are the most common way to structurally frame an upper floor in a residential building. 2 grade of douglas fir are indicated below. 176 is 14 8 x 2 for square feet 29 34 sqft. For most jobs 2 in 5 1 cm x 10 in 25 cm boards are an ideal size.

1 psf lb f ft 2 47 88 n m 2. What materials are used in beam and joist floors. 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.

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. It is a strong joint that lasts over time. Unfortunately the beautiful dovetail is hidden in the finished building but its strength and integrity is not. Maximum floor joist span for no.

Uk structures are a leading supplier of timber frame structures floor joists and roof trusses. So 192 less 16 or 176 of un supported span. Live load is weight of furniture wind snow and more. 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.

Solid timber joist sizes are provided in the bs 8103 3 span tables. Timber purlins and joists form the roof and floor framing in timber framed buildings. These subfloors do not have the solidness of a concrete slab but offer a wide variety of potential floor covering options including floorboards.