Closed cell spray foam insulation for a Woodlands tx home. Closed cell foam insulation offers Higher R-value (greater than 6.0 per inch), Lower moisture vapor permeability (low perm), Air barrier,Higher strength and rigidity,Resists water, and Absorbs sound. Open cell spray foam insulation has R-value (approximately 3.5 per inch), Higher moisture vapor permeability, but controlled, Air barrier at full wall thickness, and absorbs sound very well. Open cell insulation is used in attics and roofs. Call 360 Thermal, Woodlands insulation expert for all your insulation needs.