The following table gives details of allowable spans and spacing between joists for the most common timber sizes used in floor construction.
Timber upper floor construction details.
The width of joists is remaining 5 to 8 cm huge.
Today the upper floors in most new homes are built using factory made timber i joists also known as i beams.
You can then fit a thin plywood layer over the top to regulate your final floor finish.
A neat alternative with a timber joisted floor is to put 50mm timber battens on top of your floor deck at 400mm centres lay your underfloor heating pipes between the battens clip them to the deck and then cover with a lean mix screed.
The ends of these timber joists are built into or suspended by joist hangers from the external walls of the property.
Hollow floors also known as suspended or timber floors are simply timber joists suspended across and supported by load bearing walls under the floor.
Issues to be taken into account include.
The floor consists of wooden joists spaced 30 to 40 cm apart and supported on end walls over that timber boarding or planking is fixed.
6 4 10 construction of timber floors upper floors shall be constructed in a workmanlike manner and provide satisfactory performance.