Illinois General Assembly - Full Text of SB1179

LRB104 07390 HLH 17431 b

104TH GENERAL ASSEMBLY
State of Illinois
2025 and 2026
SB1179

Introduced 1/24/2025, by Sen. Bill Cunningham

SYNOPSIS AS INTRODUCED:

20 ILCS 3125/15

Amends the Energy Efficient Building Act. Provides that the Capital Development Board shall adopt specified provisions into the Illinois Energy Conservation Code concerning insulation in an unvented attic and an unvented enclosed rafter assemblies.

A BILL FOR

AN ACT concerning State government.

Be it enacted by the People of the State of Illinois, represented in the General Assembly:

Section 5. The Energy Efficient Building Act is amended by changing Section 15 as follows:

(20 ILCS 3125/15)

Sec. 15. Energy Efficient Building Code.

(a) The Board, in consultation with the Agency, shall adopt the Code as minimum requirements for commercial buildings, applying to the construction of, renovations to, and additions to all commercial buildings in the State. The Board, in consultation with the Agency, shall also adopt the Code as the minimum and maximum requirements for residential buildings, applying to the construction of, renovations to, and additions to all residential buildings in the State, except as provided for in Section 45 of this Act. The Board may appropriately adapt the International Energy Conservation Code to apply to the particular economy, population distribution, geography, and climate of the State and construction therein, consistent with the public policy objectives of this Act.

(b) The Board shall adopt the following provisions into the Illinois Energy Conservation Code: insulation in unvented attics and unvented enclosed rafter assemblies and insulated and air sealed with air impermeable R-30 insulation, with a maximum U-Factor of 0.038, are deemed to meet the requirements of Section R402 of the Illinois Energy Conservation Code with all of the following requirements:

(1) The house shall attain a blower door test result less than 2.5 air changes per hour at 50 pascals.

(2) The house shall require a positive, balanced, or hybrid whole house mechanical ventilation system that does not rely solely on a negative pressure strategy.

(3) Where insulation is installed below the roof deck and the exposed portion of roof rafters are not already covered by the R-30 depth of the air-impermeable insulation, the exposed portion of the roof rafters shall be insulated by minimum R-3 unless directly covered by drywall or finished ceiling. Roof rafters are not required to be covered by minimum R-3 if a continuous insulation is installed above the roof deck.

(4) Indoor heating, cooling, and ventilation equipment, including ductwork, shall be inside the building thermal envelope.

(Source: P.A. 102-444, eff. 8-20-21; 102-662, eff. 9-15-21; 102-813, eff. 5-13-22.)