Halfback H2O Universal siding insulation is designed to reduce thermal bridging and air infiltration when placed between siding and studs. It’s also vapor-permeable and has grooves that enable installers to create a drainage channel without added membranes or furring strips. It comes in ¾-inch and 1-inch thicknesses. Progressive Foam Technologies. 800-860-3626. www.progressivefoam.com.