Ducts Residential Building Code Officials
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Ducts | Residential | Building Code Officials Summary Ducts distribute conditioned air (heated or cooled) from HVAC systems to the house. It is essential for ducts to maintain a constant temperature as long as possible so that they can “deliver” it through registers in an efficient and effective manner. Research shows that as much as one third of all conditioned air can escape through leaks in a conventionally sealed duct system. Builders must seal ducts with approved (UL-181 A and B) duct sealants.
Current Code The 2009 IECC covers duct insulation and sealing in Section 403.2.
Previous Code
QUICK FACTS Duct Insulation and Sealing - Section 403.2 in the 2009 IECC Ducts outside of conditioned space must be insulated Approved sealants include UL-181 A and B duct sealant
Duct insulation requirements are identical in the 2006 and 2009 IECC. The 2009 IECC presents the first significant change to duct sealing requirements. It requires that the ducts either be (a) designed and installed in the conditioned space or (b) pressure tested to meet the specifications in Section 403.2.2. Another change to the 2009 IECC is the Section 403.7 requirement that builders construct ducts serving multiple dwelling units in accordance with Sections 503 and 504. Ducts must be insulated to R-5 when located within the building envelope and R-8 outside of it, as well as sealed to low, medium or high pressure specifications.
Mandatory for all climate zones (where applicable)
Exemptions
Duct design from EERE (w/graphics)
Requirements covered in the 2009 IECC Section 403.2 are mandatory and universal for all climate zones.
Duct testing graphic
Detailed information can be found at: Programmable thermostats from Energy Star Thermostats and control systems from EERE Duct insulation from PNNL Duct sealing from Energy Star
Requirements Building code officials must be aware of the requirements covered in the 2009 IECC and need to ensure that: All ducts outside the conditioned space are insulated Ducts are properly sealed using appropriate sealant Insulation meets statewide requirements All ducts are sealed with mastic or UL-181 A and B tapes They check for poorly installed duct work
Typical Problems Standard issues/concerns that arise include: Ducts getting buried in attic insulation
Figure 1: Properly Sealed Ducts
Lack of duct sealing within the dwelling
BCAP
OCEAN is an online resource of the Building Codes Assistance Project 1850 M St. NW Suite 1050 | Washington, DC 20036 | www.bcap-ocean.org
Ducts | Residential | Building Code Officials Summary Ducts distribute conditioned air (heated or cooled) from HVAC systems to the house. It is essential for ducts to maintain a constant temperature as long as possible so that they can “deliver” it through registers in an efficient and effective manner. Research shows that as much as one third of all conditioned air can escape through leaks in a conventionally sealed duct system. Builders must seal ducts with approved (UL-181 A and B) duct sealants.
Current Code The 2009 IECC covers duct insulation and sealing in Section 403.2.
Previous Code
QUICK FACTS Duct Insulation and Sealing - Section 403.2 in the 2009 IECC Ducts outside of conditioned space must be insulated Approved sealants include UL-181 A and B duct sealant
Duct insulation requirements are identical in the 2006 and 2009 IECC. The 2009 IECC presents the first significant change to duct sealing requirements. It requires that the ducts either be (a) designed and installed in the conditioned space or (b) pressure tested to meet the specifications in Section 403.2.2. Another change to the 2009 IECC is the Section 403.7 requirement that builders construct ducts serving multiple dwelling units in accordance with Sections 503 and 504. Ducts must be insulated to R-5 when located within the building envelope and R-8 outside of it, as well as sealed to low, medium or high pressure specifications.
Mandatory for all climate zones (where applicable)
Exemptions
Duct design from EERE (w/graphics)
Requirements covered in the 2009 IECC Section 403.2 are mandatory and universal for all climate zones.
Duct testing graphic
Detailed information can be found at: Programmable thermostats from Energy Star Thermostats and control systems from EERE Duct insulation from PNNL Duct sealing from Energy Star
Requirements Building code officials must be aware of the requirements covered in the 2009 IECC and need to ensure that: All ducts outside the conditioned space are insulated Ducts are properly sealed using appropriate sealant Insulation meets statewide requirements All ducts are sealed with mastic or UL-181 A and B tapes They check for poorly installed duct work
Typical Problems Standard issues/concerns that arise include: Ducts getting buried in attic insulation
Figure 1: Properly Sealed Ducts
Lack of duct sealing within the dwelling
BCAP
OCEAN is an online resource of the Building Codes Assistance Project 1850 M St. NW Suite 1050 | Washington, DC 20036 | www.bcap-ocean.org
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