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C402.2.1.2 Insulation Requirements for Roof Replacement
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For roof replacement on an existing building where the insulation is entirely above the deck and where the roof slope is less than two units vertical in 12 units horizontal, the insulation shall conform to the energy conservation requirements specified in Table C402.2, Opaque Thermal Envelope Requirements.
Exception: Where the required R-value cannot be provided because of the thickness limitations that occur with the existing rooftop conditions, including heating, ventilation and air-conditioning equipment, low door or glazing heights, parapet heights, or proper roof flashing heights, the maximum thickness of insulation compatible with the available space and existing rooftop conditions shall be installed.
Related Code Sections
C402.2.1.2 [CE] Commercial Energy Efficiency, Insulation Requirements for Roof Replacement
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Minnesota Energy Code 2015 > 4 [CE] Commercial Energy Efficiency > C402 Building Envelope Requirements > C402.2 Specific Insulation Requirements (Prescriptive) > C402.2.1 Roof Assembly > C402.2.1.2 Insulation Requirements for Roof Replacement
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