I built my 2x4 walls in my basement 1 inch from the concrete wall and am about to insulate with Roxul, a batt type insulation which will sit nice and snug within my 16" centered studs. My question is whether I should push it towards the back of the wall so it touches the concrete or push it only as far so it's flush with the studs, thus leaving an air gap behind?
I solved any water penetrating problem from the outside by having a new weeping tile system installed and applying blue skin and insulating with R10(2" XPS from the footing to just below the grade. Although a problem I am having and thus hesitating on how I will place my R14(Roxul) insulation is that I have some very extreme cold spots that are generally in 1 corner on a painted surface above grade which I have lots of water condensing. I am going to spray foam these areas to help add R value along with the batt insulation but I am generally concerned with what will happen to any moisture that is going to be present between the concrete wall and my insulation in other areas if a -45 deg C week comes along in the future.
My studs have been sitting for months so they are dry by now and my basement is dry as well. I will be using a dehumidifier during the summer months and will be installing a vapour barrier before drywalling. Thanks in advance for helping.