Things to considered when constructing or renovating a timber floor.
it is possible to create a suspended floor of any size using sleeper walls to bridge the span. the span that can be achieved is determined by the size of the timber joist used.
using timber joists means that they are going to be susceptible to damp and rot if not laid properly. the joist ends for new flooring joists should be laid on galvanised joist hangers, rather than embedded in walls.
where the joist rests on a wall such as a sleeper wall there must be a damp proof course between the wall and the timber.
ventilation beneath a hollow timber floor is needed as if any moisture that collects cannot be ventilated away can cause rot. airbricks need to be fitted on external walls and ventilation through the sleeper walls is required, whether using airbricks or half brick gaps in the wall construction