Commissioner of labor and industry requirement to adopt rules about unvented attics and enclosed rafter assemblies

SF 3730 requires Minnesota's Commissioner of Labor and Industry to adopt rules for unvented attics and enclosed rafter roof systems in residential buildings. The bill mandates that these systems must use air-impermeable insulation with an R-30 rating (or equivalent U-Factor of 0.038) to meet energy code standards, but only if heating, cooling, and ductwork equipment is located inside the attic. This directly affects residential builders, inspectors, and property owners subject to Minnesota's State Building Code. The rulemaking will clarify specific insulation and air-sealing requirements for these roof systems, ensuring compliance with energy efficiency standards.