I am remodeling a basement bathroom/laundry. I am looking for the best waterproofing/insulation/vapor barrier combo. I’ve been clued into various potential issues from reading posts here. I have selected RadonSeal to waterproof the block wall where I discovered a small groundwater leak. Now I need to know how this product impacts my insulation decision. I believe the RadonSeal will provide a vapor barrier at the inside face of the block wall. Does that mean I should go with XPS installation to allow inward drying? Or could I use ISO and create another vapor seal? I’m constrained to 1.5” furring so I may use 2x2s with 1.5” insulation or 1x3s with ¾” insulation in 2 layers. Or would and air space be prefered?