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// CODE SNIPPET

M1601.4.6 Duct Insulation

Residential Code 2018 of Kansas > 16 Duct Systems > M1601 Duct Construction > M1601.4 Installation > M1601.4.6 Duct Insulation
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Duct insulation shall be installed in accordance with the following requirements:
  1. A vapor retarder having a permeance of not greater than 0.05 perm [2.87 ng/(s • m2 • Pa)] in accordance with ASTM E96, or aluminum foil with a thickness of not less than 2 mils (0.05 mm), shall be installed on the exterior of insulation on cooling supply ducts that pass through unconditioned spaces conducive to condensation except where the insulation is spray polyurethane foam with a water vapor permeance of not greater than 3 perms per inch [1722 ng/(s • m2 • Pa)] at the installed thickness.
  2. Outdoor duct systems shall be protected against the elements.
  3. Duct coverings shall not penetrate a fireblocked wall or floor.

Related Code Sections


M1601.4.6 Duct Systems, Duct Insulation
Duct insulation shall be installed in accordance with the following requirements: A vapor retarder having a permeance of not greater than 0.05 perm ...
Residential Code 2018 of Kansas > 16 Duct Systems > M1601 Duct Construction > M1601.4 Installation > M1601.4.6 Duct Insulation
602.2.1.8 Duct Systems, Pipe and Duct Insulation Within Plenums
Pipe and duct insulation contained within plenums, including insulation adhesives, shall have a flame spread index of not more than 25 and a smoke ...
Mechanical Code 2018 of Kansas > 6 Duct Systems > 602 Plenums > 602.2 Construction > 602.2.1 Materials Within Plenums > 602.2.1.8 Pipe and Duct Insulation Within Plenums
604.13 Duct Systems, Internal Insulation
Materials used as internal insulation and exposed to the airstream in ducts shall be shown to be durable when tested in accordance with UL 181 ...
Mechanical Code 2018 of Kansas > 6 Duct Systems > 604 Insulation > 604.13 Internal Insulation
604.11 Duct Systems, Vapor Retarders
Where ducts used for cooling are externally insulated, the insulation shall be covered with a vapor retarder having a maximum permeance of 0.05 perm ...
Mechanical Code 2018 of Kansas > 6 Duct Systems > 604 Insulation > 604.11 Vapor Retarders
604.12 Duct Systems, Weatherproof Barriers
Insulated exterior ducts shall be protected with an approved weatherproof barrier ...
Mechanical Code 2018 of Kansas > 6 Duct Systems > 604 Insulation > 604.12 Weatherproof Barriers
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