FOR IMMEDIATE RELEASE
February 23, 2026
Contact: press@theibe.org
WASHINGTON, DC – Today, the Institute for the Building Envelope (IBE) announced its support for Minnesota HF 3129 and the recently filed SF 3730, legislation requiring the commissioner of labor and industry to adopt rules governing unvented attics and enclosed rafter assemblies under the State Building Code. The House Bill was authored by Rep. Danny Nadeau and the Senate bill is led by Sen. John Hoffman in the Senate, alongside Sens. Nick Frentz, Gene Dornink, and John Jasinski as co-sponsors.
These bills would ensure that unvented attic and enclosed rafter assemblies insulated and air sealed with air-impermeable insulation meeting R-30 standards are deemed compliant with Minnesota’s Residential Energy Code when HVAC equipment and ductwork are located within the conditioned space. This commonsense update reflects modern building science and provides clarity for builders, code officials, and homeowners.
“HF 3129 and SF 3730 represents a smart, forward-looking step improve efficiency and affordability as it relates to the Minnesota’s building code,” said Stephen Wieroniey, Executive Director of the Institute for the Building Envelope. “Properly designed and insulated unvented attic systems improve energy efficiency, reduce emissions, enhance indoor comfort, increase building durability, and lower upfront and monthly ownership costs. This legislation aligns the code with proven building envelope practices that deliver real benefits for homeowners and the environment.”
A high-performing building envelope is critical to reducing energy waste and strengthening resilience against extreme weather. By recognizing unvented attic and enclosed rafter assemblies insulated with air-impermeable materials, HF 3129 and SF 3730 support innovative construction techniques that better control air leakage, moisture intrusion, and thermal performance.
IBE looks forward to working with Representative Nadeau and Senators Hoffman, Frentz, Dornink, and Jasinski to advance HF 3129 and SF 3730 through the legislative process. The organization is committed to serving as a resource to lawmakers, regulators, and stakeholders to foster sound building science as well as safe, energy-efficient construction practices across Minnesota.
“The Institute for the Building Envelope was formed to promote innovative, multifunctional materials that increase energy efficiency, safety, and comfort. This legislation does exactly that. We are proud to support this legislation and stand ready to help move it across the finish line,” Wieroniey concluded.