The purpose of wall insulation is to reduce the amount of heat that flows from a dwelling unit through the walls to the cold outside air. By reducing this heat loss, wall insulation reduces the amount of energy needed to heat the dwelling unit. Wall insulation also can save on cooling costs and reduce overheating in the summer.A material’s resistance to heat flow is measured in units of “R-value.” The higher the R-value, the better the insulating properties. The R-value of insulation depends on the type of insulation and its thickness.
- Sprayed or blown insulation
- blown fibers
- Rigid board
- Cavity fill insulation must be compatible with building materials.
- Cavity fill insulation should be blown in under pressure or expanded within the wall to insure even distribution.
- All materials must meet local codes.
- Exterior and interior insulating panels should be protected from impacts, vandalism, and abrasions.
- Exterior insulation panels should be protected from weather and ultraviolet radiation.
- Finish and detailing around doors, windows, and other openings should be considered so as not to detract from building appearance and operation of equipment.
- Increasing wall insulation can reduce energy costs approximately 15 to 25 percent.