Question: Do you recommend adding R-20 insulation to a 25,000 sq.ft. uninsulated roof (R-5) when you consider a 25-year life cycle with a rate of return

Do you recommend adding R-20 insulation to a 25,000 sq.ft. uninsulated roof (R-5) when you consider a 25-year life cycle with a rate of return of 8 percent? Assume the following:

Heating Degree-days: 5144

Cooling Degree-days: 987

Fuel Cost: $5/MMBtu

Boiler efficiency: 0.70

Electric rate: $0.10/kWh

Refrigeration requirement: 0.75kW/ton

Insulation cost: $0.225 per sq.ft

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