Is Stucco a Good Insulator?
The amount of insulation any material provides is measured in r-value, which means the amount of thermal resistance a material has. Thermal resistance is the ability of the material to keep warm air in and insulate any given area. Stucco has an r-value of 0.2, which is considerably low when compared to actual insulation materials such as polyurethane foam or polystyrene, which both have r-values of more than 5. However, stucco has a higher r-value when compared to other wall cladding materials, such as concrete, stone, some brick walls and tile, which have r-values ranging from 0.05 to 0.1.
