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ROUGH DESIGN CRITERIA FOR HEAT LOSS CALCULATION
For more in debt analysis of U valves.
Best Overall Guide
For walls; cavity, solid, insulated, materials and debts;
http://www.combustionresearch.com/Infra-Spec/infra-spec/uvalue.html
Windows, Glazed and materials, debts of glass;
http://www.gsecg.com/residential-secondary-glazing-thermal-insulation-glazing-types-u-values
Another useful resource (also good for windows and others)
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