Someone mentioned to me that you could build above the external Damp Proof Course (DPC) as long as you protected it with a membrane Damp Proof Membrane (DPM).
Im not convinced and think this will cause issues long term and wanted some other peoples thoughts on the matter ?
Please see below, existing and proposed sketches explaining the detail in more depth.
My initial concerns are as follows :
- a) If any moisture gets between the DPM and the brickwork above the DPC it not be able to escape and will cause issues
- b) If any moisture / rising damp gets introduced into the brick work below the DPC it will not be able to escape and will cause issues
- c) The bond between the DPM and the brickwork could be prone to failure
- d) If any water gets behind the DPM during a freeze it could expand and open cracks which could let more water / moisture in
Im keen to hear other peoples thoughts on the matter and wether this is a good construction detail or not. Im skeptical that it is.
