Additional insulation may be installed in Superior Walls products. Since open cell products, like fiberglass batts, could contribute to moisture issues, we recommend closed cell insulation products, like DOW Styrofoam. The idea here is to prevent the moisture present in the air from penetrating the insulation and reaching the cooler wall surface and condensing. Closed cell insulation will keep any airborne vapor on the room (warm) side of the insulation, eliminating condensation.