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7 Boosting the R-value of a wall from 0 to R-10 cuts


90 percent of heat loss from one side of the wall to the other. This makes an immediate difference you can feel. Adding an additional layer of R-15 insulation to the R-10 layer (a total R-value of 25) only cuts another 6 percent of heat transmission. Further increasing insulation thickness from R-25 to R-35 helps only by a little more than 1 percent. In some regions with several months of very cold


winds, increasing attic insulation values from R-25 to R-35 or even to R-50 can be worth the investment over the life of your home. In most seasonal climates, however, replacing single-pane windows saves more  walls (assuming R-25 to R-30 is common throughout the home).


A typical single-pane window possesses an R-value


 low-emissivity (low e) insulated coatings boasts an R-value of 8.3. Based on an electricity cost of 10 cents per kilowatt-hour (kWh), a home with 18 single-pane windows (4 square feet each) could waste $94.32 in  hours per day of a 40 degrees Fahrenheit indoor/outdoor  assembly would cost $10.20 over the same time. After a year, savings from switching out the windows could surpass $300. Energy auditors and electric cooperative staff


Recommended Insulation Levels New,Wood-Framed Homes 4 5 3 8 7


Zone 1 2 3


4 5


67 8 2 1 Heating System


All Gas, oil, heat pump Electric furnace


All All


Gas, oil heat pum Electric furnace


All oil, heat pump Attic


R30 to R49 R30 to R60 R30 to R60


R38 to R60 R38 to R60


R49 to R60 2


Cathedral Ceiling Wall Cavity R22 to R15 R22 to R38


R13 to R15


R22 to R38 R30 to R38


R30 to R38


R30 t R60 R30 to R60


R30 to R60


R13 to R15 R13 to R15


R13 to R15 R13 to R21


R13 t R21 R13 to R21


Floor R13


R13 to R15 R19 to 25 R25


R13


R25 to R25 t


R


R25 to R30 R25 to R30


R25 to R30 Source: U.S. Department of Energy CE-0180 2008 Insulation Fact Sheet 3 6 7


are trained to discuss the pros and cons of energy   can add up at www. TogetherWeSave.com. Also, see Doug Rye's column on page 14 on how investments made now can increase your home's value and comfort for years to come.


6 5 4


Kris Wendtland writes on   -   -  


Sources:      - -  


OEC News Magazine | February 2012


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