Finished Floor Level Above Dpc

The floor can be wherever you want it obviously even well below ground level in the case of basements so long as it is.

Finished floor level above dpc. I m currently building a single story extension on my house. The ground level dpc is actually required to be at least 150mm above the ground level see building regulations for england wales part c section 5 5. Top of timber pile above finished ground level 300 mm or 150 mm with dpc top of concrete pile above finished ground level 150 mm with dpc top of foundation wall above finished ground level 225 mm suspended timber floor construction bottom of cladding 200 mm suspended timber floor construction underside of joists i e. The walls are built from concrete blocks and is almost ready for flat roof construction.

This is to reduce the incidence of splashback from rain and to ensure a minimum amount of elevation above standing water that may come about in exceptionally heavy rain or other. I have measured to the dpc from the current path shown on the image below current sits at just. It is a requirement that the dpc is at least 150mm above ground level. Rising damp and some penetrating damp can be caused by faults to or the absence of a damp proof course dpc or damp proof membrane dpm.

Unfortunately i have noticed the inner leaf dpc is a whole block above finished floor level. If the dpc of the existing building is lower than the finished floor level of the extension timber floor on property and i want a solid floor in the extension will the membrane i put down stop any issue with having the finished floor level above dpc inside. Dpc above internal floor.