Please Help!!! Dimple membrane a necessity?
I am doing a finished basement that has a perimeter drain (see photo). To clarify, I want to put a stud wall along the edge of the perimeter drain. I purchased some 2.5-inch felt backed poly-iso and had intended to stud against it. Do I put the 2.5-inch rigid foam on the cinder block wall (it would be over the drain), and then add the stud wall to meet the rigid foam? Would dimple membrane be needed or would any condensation run down the foam board into the french drain to the sump? Walls are painted with drylock; no water problems in basement with sump working in heavy rain. I need advice on best method. Thanks for any suggestions.