Twelve years ago I built an earth-burmed home for my family. On the exterior of the(3) poured concrete walls(the exposed wall is framed) I glued on 2 in. thick styrofoam insulating board. On the inside I furred out from the concrete walls with 1 1/2 in furring strips. I did not install any insulation between this furring thereby making a (semi) dead air space. I have had some minor moisture problems from condensation. QUESTION- Does anyone out there know of a product such as a spray foam insulation that I could install in this air space myself? I understand that some products continue to expand as it cures and can blow drywall off of the studs, and crack joints. I estimate that I will need a product that will provide aproximately 171 cu/ft of (cured) insulation. Can anyone help me find this info?