A. All ceilings that face an outdoor or unheated space must be insulated to an R-value of 57 or greater.

B. All walls that face an outdoor or unheated space must be insulated to an R-value of 38 or greater.

C. All floors over unheated spaces must be insulated to an R-value of 25 or greater.

D. Slab-on-grade floors must have perimeter insulation of either:

(1) R-15 when the insulation extends downward from the top of the slab to the design frost line; or

(2) R-15 when the insulation extends around the perimeter and horizontally or diagonally beneath or away from the slab for a distance equivalent to the depth of the frost line.

E. All foundation walls adjacent to a heated space must be insulated from the top of the foundation to the frost line to an R-value of 19 or greater.

F. All windows and glass in doors, when the glass in the door constitutes 1/3 or more of the door area, must have a total window unit R-value of 2.5 or greater.

G. All exterior doors must be insulated or equipped with a storm door.

H. All new construction and renovation must comply with infiltration and ventilation standards established by the commissioner commission.

4. Performance-based compliance. Effective January 1, 1992, the commissioner The commission may waive the requirements of subsection 3 for any building if the commissioner commission determines that the building's calculated annual energy consumption is not greater than the annual energy consumption of a similar building constructed in accordance with subsection 3.

The commissioner shall commission may adopt rules that establish a performance-based compliance procedure for residential