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Hello Woody, my concern is that in some cases 20mm of DPC overlap could still leave gaps for water to go in to the cavity in between the joints in the stonework because it won't sit flush up against the stone. As long as I bring the DPC out beyond the "weakest link" in the stonework, then...

Hi Notch, I understand that the internal block return is to provide a more secure fixing point for the windows and doors, rather than leave a fully open 150mm cavity. Interesting point about the DPC. I like the idea, so if I understand you correctly, essentially wrapping around the insulation...

Thanks for the advice, Woody. There is a cavity tray, yes. It has been made using DPC layer above the opening, though I don't see any visible weep holes. How far must the DPC wrap around the stone face? I am thinking that water would simply track between the DPC and mortar then go into the...

Hi, I would like a view on how best to close the cavities around window and door openings. The wall is 7N blockwork on the internal leaf and rough stone on the outer, which results in a very undulating cavity size. I have 80mm tongue and groove insulation in a 150mm cavity. The stone is at...