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Insulation Shields for Hot Vents
When is an Insulation Shield required for B-Vent in an Attic?
The 2003 and 2006 International Mechanical Code (IMC) says in 802.8 that:
“Where vents pass through insulated assemblies, an insulation shield constructed of not less than No. 26 gage sheet metal shall be installed to provide clearance between the vent and the insulation material. The clearance shall be not less than the clearance to combustibles specified by the vent manufacturer’s installation instructions. Where vents pass through attic space, the shield shall terminate not less than 2 inches (51 mm) above the insulation materials and shall be secured in place to prevent displacement. Insulation shields provided as part of a listed vent system shall be installed in accordance with the manufacturer’s installation instructions.”
Refer to the illustration below.
