Flat Roof Insulation

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This incentive is available for the improvement of insulation in most building types, except for data centers, greenhouses, grocery stores and indoor agricultural facilities.

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Required Documentation: 

  • Scaled Floor Plan: A detailed floor plan indicating the total roof area to be insulated.
  • Roof Construction Details: A sketch or detailed drawing showing a section cut of both the existing and proposed roof insulation configurations.
  • Specifications of the proposed roof insulation.

Important Consideration:

  • Larger commercial and industrial customers are advised to apply through the custom section of the application process.
  • Applicability: eligible for retrofit projects only.
  • Baseline Efficiency: existing flat roof insulation with an R-value below R-9, or uninsulated roofs in conditioned spaces.
  • Qualifying Efficiency Requirement:
    • All materials must be new and comply with applicable state and local codes. Installation must adhere to the manufacturer's requirements.
  • Insulation shall be "Entirely Above Deck" or in "Metal Buildings" as defined by ASH RAE 90.1 2013, installed between conditioned and unconditioned areas.
    • Insulation levels qualify for a given incentive if they either start below or exceed the final R-value:
      • R-9 to R-18 qualifies for R-10 to R-18 incentive.
      • R-10 to R-19 qualifies for R-10 to R-18 incentive.
      • R-11 to R-19 doesn't qualify for R-10 to R-18 incentive but qualifies for R-12 to R-18.
      • R-10 to R-17 doesn't qualify for any incentive.
  • Exclusions: See description.
  • Other requirements: Roof insulation improvements must occur in spaces heated with natural gas-fired equipment during winter.