IMC · 2024 International Mechanical Code

§603.4 · Supply ducts in unconditioned space sized to R-8 (flexible) / R-8 (rigid) for SE Wisconsin duct insulation; return-side insulation remains R-6.

Local amendment on §603.4 for the IMC 2024 SE Wisconsin jurisdiction.

Plain-English explainer

The SE Wisconsin amendment to §603.4 keeps the IMC R-6 / R-8 supply-duct R-values, but writes them as 'R-8 flexible / R-8 rigid' for SE Wisconsin. The drafter cites it for permits pulled in Milwaukee / Waukesha County.

Why inspectors flag this

A crew that stocks R-6 flexible for the supply run will fail the SE Wisconsin rough-in; the drafter lifts the rule so the wrap matches the local amendment.

As quoted in the code: See §603.4 amendment.

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