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Thread: Geothermal Design
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24-12-2011, 03:37 PM #17
Re: Geothermal Design
for example a good triple glazed, double low E, argon (a bit above standard here) would have an R value of 4.5-5. U value is 1/r value. 100mm of urethane foam would be r-26 and is approximately our code requirement.