Connecticut Residential Building Codes Going Green.

Real Estate Broker/Owner with DMK Real Estate Ct RE Broker 0789963



Connecticut Residential Building Codes Going Green.


On the books for Connecticut is to this fall of 2011 is to adapt the 2009 International Energy Conservation Code (IECC) into the State Building Code. The 2009 IECC contains several major improvements in energy efficiency over the current 2006 IECC state code.


The most notable changes will improve the duct sealing of HVAC systems and efficient lighting requirements. The code will apply to single family housing and multi-family housing three stories or less for new construction, additions, alterations, renovations and repairs.




The primary zone 5 building envelope requirements for all Connecticut residential buildings in the 2009 IECC are:


  • R-38 Ceilings
  • U-0.35 Windows and Doors
  • R-20 Walls
  • R-30 Floors
  • R-10 Foundations


 Notable requirements in the 2009 IECC:


  • Building envelope must be caulked and sealed.
  • Slab-on-grade insulation is R-10 to a depth of 2 feet.
  • Supply ducts in attics must be insulated to R-8. Return ducts in attics and all ducts in crawlspaces, unheated basements, garages, or otherwise outside building envelope must be insulated to R-6.


  • All ducts must be sealed and either:
    • Verified by pressure testing - the duct system has to be tested and the air leakage out of ducts must be kept to an acceptable maximum level.
    • Installed entirely within the building thermal envelope - testing is not required if all ducts are inside the building thermal envelope (for example in heated basements), though the ducts still have to be sealed.
    • Piping for hydronic (boiler) heating systems must be insulated to R-3.
    • Although vapor barriers are not required by the IECC, the I-codes do set wall vapor barriers requirements in Section R601.3 of the 2009 IRC, and vapor barriers are required in Zone 5.
    • Less insulation is allowed for mass walls and more insulation is required for steel framing.
    • 50% of the lighting "lamps" (bulbs, tubes, etc.) in a building must be highly efficient. Compact fluorescents qualify, standard incandescent bulbs do not.
    • Standard I-code administrative requirements (inspections, documentation) apply.
    • A certificate must be posted near the electrical panel listing insulation levels and other energy efficiency measures. 


Exemptions/Allowances from prescriptive measures:


    • One door and 15 ft2of window area are exempt
    • Skylight U-factors are allowed to be U-0.60
    • 500 ft2or 20% of ceiling area of cathedral ceiling, whichever is less, is allowed to have R-30 insulation 






David Popoff is a license Realtor in Connecticut with William Raveis office in Darien.   
A resident of Fairfield County for over 40 years with 30 years of work experience throughout lower Fairfield County and now resides in Darien, Ct since 2004.


  • NAR Green designee.
  • David Popoff is an accredited LEED Accredited Professional (LEED AP) Homes and USGBC member of the Connecticut chapter (CTGBC).  
  • Associate member and an accredited Certified Green Professional (CGP) of National Association of Home Builders (NAHB) and the local chapter HBRA-Fairfield County, Ct. .
  • Contact David Popoff for all your real estate needs in lower Fairfield County, Connecticut. Member of the Connecticut Association of Realtors, CAR.
  • Member of the National Association of Realtors, NAR.
  • Member of the Darien MLS, Greenwich MLS & Greater Fairfield County, Ct MLS.








Posted by

David Popoff
Connecticut Licensed Real Estate Broker
Realtor® Green
Seller Representative Specialist
Accredited Buyer Representative


DMK Real Estate, Darien, CT.
Cell (203) 228-0646




DMK Realty, 06820 





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Chris Smith
Re/Max Chay Realty Inc., Brokerage - New Tecumseth, ON
South Simcoe, Caledon, King, Orangeville Real Esta

David thanks for sharing these great Conneticut initiatives... proper duct sealing alone will result in much greater efficiency.  I here "they" are recommending R50 in the ceilings now, but R38 is an improvement.

Sep 06, 2011 04:16 AM #1
Judi Boad

Hi David~ It is exciting to see residential building codes coming of age throughout the country! A good thing for all of us!

Best regards from Seattle,

Sep 06, 2011 05:01 AM #2
David Popoff
DMK Real Estate - Darien, CT
Realtor®,SRS, Green ~ Fairfield County, Ct

Yes, these energy efficient building codes will save millions in energy costs. Chris regarding the R50 insulation I was at a building seminar and the engineer said that there is a point where the insulation gets so thick it really does not make a difference and you are better off putting your money in other energy efficient features.

Sep 06, 2011 05:56 AM #3
Cathy Criado
Criado Realty - San Antonio, TX
Making Real Estate Profitable


Interesting post David.  I heard recently from some politicians that going green in terms of codes are bad.  It makes housing unaffordable. I disagree, mostly. In the long run it will save them money, and it's being financed so it isn't like one big up front cost.  Adding insulation and efficient lighting is the easiest, most affordable option.  I'm seeing more LOW cubed windows these days too.  Great post. I'll check on mine this week and see what's happening in code revamping. Suggested.


Sep 06, 2011 09:27 AM #4
David Popoff
DMK Real Estate - Darien, CT
Realtor®,SRS, Green ~ Fairfield County, Ct

Actually these codes will save homeowners money. Losing heat through leaky duct work is just poor workmanship, the energy efficient light bulbs will save you about $142 over the life of the bulb, see my post on it below is the link.



Sep 06, 2011 09:39 AM #5
The Scott Loper Team Bux-Mont Premier Properties
Keller Williams Real Estate - Montgomeryville - Lansdale, PA

Hi David,

It is very encouraging that building officials and the codes are getting onboard with making homes more energy efficient.  Progress!


Sep 07, 2011 02:16 AM #6
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David Popoff

Realtor®,SRS, Green ~ Fairfield County, Ct
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