DPC - Can I do this?

Wiredcharlie · Posted: Sun Oct 04, 2009 3:43 pm Post Subject: DPC - Can I do this?

Am I allowed to do this:

DPC shown red.

Much appreciated

Tony

freddymercurystwin · Posted: Sun Oct 04, 2009 6:04 pm Post Subject:

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.

Wiredcharlie · Posted: Mon Oct 05, 2009 7:18 am Post Subject:

In practice, would the DPM be trapped between the blocks as shown?

freddymercurystwin · Posted: Mon Oct 05, 2009 9:25 am Post Subject:

You mean on the right? It could be trapped with friction between the new and existing slab.