![]() Place rigid-board insulation in the drainage cavity to maximize interior usable space, and take advantage of the huge thermal mass provided by the masonry backup system.Sustainablility / Green Building Design.Sustainable Concrete Masonry - Assuring a Healthy Future One Block at a Time.Regional material (where applicable) 2 pts.Energy efficiency, thermal comfort and energy analysis – up to 10 pts.Use either thicker insulation or more expensive polyisocyanurate to achieve a higher energy rating. ![]() Extruded polystyrene yields 5.0 R per inch (7.5 R for 1.5" or 10 R for 2"). Expanded polystyrene insulation is worth 4.0 R per inch (6.0 R for 1.5" or 8 R for 2"). Polyisocyanurate insulation gives you 8.0 R per inch (12.0 R for 1.5" or R16 for 2"). Note: The type of rigid insulation you install affects the wall’s insulating capacity (the R-value). Thermal Mass Advantages of Masonry Walls.R-value: 13.71 using 2" extruded polystyrene insulation (see note below) R-value: 11.71 using 2" expanded polystyrene insulation (see note below) STC=(weight of wall) 0.223x21.5 Wall Weight (lb/sq. Fire Endurance Ratings of Clay Brick Masonry. ![]()
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