***Values are for new and undusted radiant barrier installations percentages will be lower for aged radiant barriers. The radiant barrier did not extend over the rafters, but was stapled near the joints between the rafters and the roof deck. **Test was a simulation of draped configuration. Typical average ventilation rates are somewhat lower. *Tested at attic air space ventilation rate of five air changes per hour. Savings are for a 25 year period.Īverage Reductions In Ceiling Heat Flow Due To Addition of Radiant Barrier to R-19Īttic Floor Insulation SUMMER COOLING CONDITIONS Radiant Barrier Location *Denotes existing level of conventional attic insulation (for example, R-11), and additional amount (for example, R-8). Present Value Savings for Additional Insulation City Second value applies to houses with air-conditioning ducts in attics. Note: First value applies to houses with no air-conditioning ducts in attics. Present Value Savings for Radiant Barrier Draped over Tops of Rafters or Attached to Roof Deck Second value appliesto houses with air-conditioning ducts in attics.įigures in table are based on a radiant barrier with an emissivity of 0.05 or less, with the radiant barrier covering the insides of the gables. (Note: R-11, R-19, R-30, and R-38 refer to the existing level of conventional insulation.) Present Value Savings for Radiant Barrier Attached to Bottoms of Rafters This level of degradation would be typical over 25 years of exposure.įigures in table are based on a radiant barrier that had an emissivity of 0.05 or less when clean. Note: Values represent range of savings due to variations in rate of dusting and to uncertainties in effect of dust on heat flows. Present Value Savings, Dollars per Square Foot of Attic Floor (Note: R-11, R-19, R-30, and R-38 refer to the existing level of conventional insulation.) City Present Value Savings for Dusty Radiant Barrier on Attic Floor
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Source: Residential Construction and Utility Cost data base, developed by NAHB National Research Center, 1986. Note: The higher the R-value, the greater the insulating power. Source: Reflective Insulation Manufacturers Association.Ĭosts for Conventional Attic Insulation Installed by Contractors R-Value Since the total area of the roof and gables is larger than the area of the ceiling, roof applications will require about 7 to 50 percent more material than an attic floor application, depending upon the shape of the roof. *The cost figures in this table are the costs per square foot of radiant barrier. Roof: stapled to bottom or faces of rafters Costs for Radiant Barriers Installed by Contractors Costs per Square Foot of Material *