Insulation, Radiant and Vapor Barriers - calculating BTU loss

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Poolboy
11-12-04, 08:33 AM
I have a 1000 sq ft, kitchen ceiling, (flat roof exterior), currently insulated at an R value of 15. I may increase the new flat roof insulation, (soon to be installed), with an R value of 30 for an additional $2,300.

I do not need an exact answer here, but a ballpark guess would help:
Q: If the indoor temp is 68 and the outdoor temp is 28 degrees, how much BTUs would I lose in a 24 hr period with a 1000 sq ft, R15 ceiling/roof compared to a R30 ceiling/roof?

Assume any variable such as windows/doors to be the same in any calculation. Just need a ballpark guess so I can determine my Return on Investment over 10 or 20 years of life for the new roof. I will calculate the BTU loss vs. $$ per 1000 BTus over a winter season in Cleveland Ohio.

Sharp Advice
11-12-04, 08:50 AM
Hello: Poolboy

Heat loss calculator may help.

http://www.heatload.com/html/heatload_workshop.html

www.hvac-talk.com