Thanks mate I thought that for the base. And for the existing cavity wall should the dpc run up that on the inside of the outer brick skin when I do the concrete base. Right in the corner does look damp at the bottom of the cavity. Then insulate and block up?
We have just started renovation work on a 1930s property we have just purchased. 2 extension have been added at various times over the years. We have opened internal solid walls between to of the rear extension. Can somebody advise on how to make the concrete base and existing cavity good. See...