Planning, zoning, and building laws — insulation requirements.

(1) All housing projects of a municipality shall be subject to the planning, zoning, sanitary, and building laws, ordinances, and regulations applicable to the locality in which the project is situated.

(2) All dwellings which are part of housing projects and which are proposed to be rented to low-income families or the elderly through the programs of the United States department of housing and urban development shall have ceiling insulation having an R value of 38 in the attic, floor insulation having an R value of 20, or perimeter wall insulation having an R value of 10 beneath all habitable heated areas or over unheated spaces. In addition, basement walls shall have insulation with an R value of 6 to their full height, with insulation in the box sill having an R value of 20. As used in this section, “R value” means resistance to heat flow.

(3) The insulation requirements of this section are effective for all dwellings, the construction of which begins on or after July 1, 1991. For dwellings existing or under construction prior to July 1, 1991, the dwelling must comply with the insulation requirements of this section by June 30, 1996.

[C62, 66, 71, 73, 75, 77, 79, 81, §403A.11]91 Acts, ch 270, §5; 2017 Acts, ch 54, §76