Energy codes and tapered insulation
A question frequently asked regarding roof systems incorporating tapered insulation is what minimum insulation thickness should be used to comply with the applicable energy code's minimum thermal insulation requirements.
Energy codes regulate the efficient use of energy in buildings and provide minimum thermal insulation requirements for building envelopes. For roof assemblies using tapered insulation, roofing professionals often are unclear how to represent tapered insulation R-values.
Roofing professionals generally represent R-values of tapered insulation systems based on the average
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