Mich. Admin. Code R. 408.31063a - [Rescinded effective 8/29/2025] Specific insulation requirements (prescriptive)
Rule 1063a Section R402.2.12 of the code is amended to read as follows.
R402.2.12. Thermally isolated sunroom insulation. The minimum ceiling insulation R-values shall be R-24 in zones 5 to 7. The minimum wall R-value shall be R-13 in all zones. New wall or walls separating a sunroom from conditioned space shall meet the building thermal envelope requirements.
Notes
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Rule 1063a Section R402.2.12 of the
R402.2.12. Thermally isolated sunroom insulation. The minimum ceiling insulation R-values shall be R-24 in zones 5 to 7. The minimum wall R-value shall be R-13 in all zones.