Foam Tech Insulation can add insulation to your walls in an existing house from the outside with any covering BRICK, BLOCK, VINYL, ALUMINUM or WOOD, saving you up to 50% on your energy bills. INSULSMART? Wall Foam a non-expanding foam is Foam Tech's product of choice for insulating an existing home. Being a non-expanding foam insulation, it will not cause problems like cracking drywall because of its zero expansion. Wall Foam by INSULSMART? is much more effective than traditional insulation products, because the foam insulation is applied as a liquid. As it is injected, it conforms and fills each cavity, crevasse, and void to create a thermal envelope. Wall Foam by INSULSMART? acts as a highly efficient seal against air infiltration, which is the number one source of energy loss.