The 2015 IECC with Connecticut specific amendments went into effect on October 1, 2018. Below is a summary of changes to the building envelope-related requirements in the updated code for Connecticut.

Code Change Highlights:

  • Air leakage requirements have been amended for attached dwelling units in low-rise buildings. For dwelling units greater than 850 square feet of floor area, the air leakage threshold shall be set at five air changes per hour. If the dwelling is less than or equal to 850 square feet of floor area, the air leakage threshold shall be set at 6.5 air changes per hour.
  • Foamed-in-place insulating material, except urethane foam insulation or styrene foam insulation, shall not be sold or installed in the state on or after May 28, 2013, unless the manufacturer or supplier has certified to the State Building Inspector that the materials comply with the provision of section 29-277 of the Connecticut General Statutes.
  • A duct air leakage test shall not be required where the ducts and air handler are located entirely within the building thermal envelope.

Energy-Efficient, Cost-Effective Construction with Fiberglass and Mineral Wool Insulation

As code levels advance, keep informed about innovative practices to meet or exceed code requirements using cost-effective fiberglass and mineral wool insulation.

The following resources are just a subset of the many guides available from the Insulation Institute to help you achieve new performance requirements with proven approaches.

  • Air Leakage: As states adopt more stringent energy codes, some builders may experience challenges meeting new mandatory air leakage requirements. Fiberglass and mineral wool insulation is the low-cost solution for homebuilders to meet or surpass code air leakage rate requirements of 3 or 5 air changes per hour depending on climate zone. For homeowners, an airtight building envelope results in energy savings and increased thermal comfort.
  • Ducts Buried Within Ceiling Insulation: Deeply buried ducts in attics is an easy way to lower energy code compliance costs for builders using the simulated energy performance path. Homeowners can benefit from energy savings realized from lower-capacity, lower-cost HVAC systems.
  • Proper Installation of Insulation: Grade I installation delivers superior energy efficiency and is increasingly required by state energy codes. Insulation installation jobs that fail to meet Grade I criteria can mean construction delays due to callbacks, HERS rating penalties, and failed code inspections. Grade I installation is readily achievable by following basic guidelines as recommended by manufacturers. NAIMA offers free online training for installers.
  • Unvented Attics Using Fiberglass and Mineral Wool Insulation: Unvented attics can be constructed by installing fiberglass or mineral wool insulation below the roof deck instead of using more costly materials like spray foam. In addition, fiberglass and mineral wool insulation products are green certified and do not carry recommended occupancy restrictions due to product off-gassing after installation. Starting with the 2018 IRC, this practice is outlined in detail within the code. Homeowners benefit from lower construction costs and the use of a safe product.

To view a listing of key envelope changes in the 2018 Connecticut Energy Code, download the detailed summary.

This summary is offered for informational purposes only. It does not purport to be an exhaustive analysis of code changes or provide advice that will ensure guaranteed compliance with any energy code provision. Please consult with local authorities before finalizing your installation plans.

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