Am I allowed to do this:
DPC shown red.
Much appreciated
Tony
DPC shown red.
Much appreciated
Tony
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DPC - Can I do this?
- Thread starter Wiredcharlie
- Start date
Yes, although if the slab drops slightly as the hardcore compresses on the right hand side the dpm may split so try an leave a little slack on that side. My local authority would insist on a single skin of blockwork under that side to prevent that happening (but then we have Radon down here). BTW its a dpM (membrane) when under the slab and a dpC (course) when in a wall. 
In practice, would the DPM be trapped between the blocks as shown?
You mean on the right? It could be trapped with friction between the new and existing slab.
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