Finished Floor Level Above Dpc

I am looking to build an outside patio area to the same level as the internal kitchen diner floor.

Finished floor level above dpc. I have measured to the dpc from the current path shown on the image below current sits at just. 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. 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. That the dpc is at least 150mm above ground level.

The walls are built from concrete blocks and is almost ready for flat roof construction. Dpc above internal floor. I m currently building a single story extension on my house. The floor can be wherever you want it obviously even well below ground level in the case of.

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. Finished floor level same as ground level. 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. A damp proof course is a barrier usually formed by a membrane built into the walls of a property typically 150 mm above ground level to prevent damp rising through the walls.