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Buildings that comply with the following shall be exempt from the building thermal envelope provisions of this code:. Are separate buildings with floor area not more than 500 square feet (50 m 2).; Are intended to house electronic equipment with installed equipment power totaling not less than 7 watts per square foot (75 W/m 2) and not intended for human occupancy.
The minimum thermal resistance (R-value) of the insulating material installed either between the roof framing or continuously on the roof assembly shall be as specified in Table 502.2(1), based on construction materials used in the roof assembly.Exception: Continuously insulated roof assemblies where the thickness of insulation varies 1 inch (25 mm) or less and where the area-weighted U-factor