Section SPS 322.30 - General design requirements(1) GENERAL. Dwelling thermal envelope insulation amounts and details shall be determined using one of the methods described in this subchapter.(2) INFILTRATION. (a) Infiltration for heating design loads shall be calculated based on a maximum of 0.5 air change per hour in the heated space.(b)1. If the proposed design takes credit for a reduced air change per hour level, documentation of the measures providing the reduction or the results of a post-construction blower door test conducted in accordance ASTM E 779 shall be provided to the department.2. The minimum air change per hour rate may not be less than 0.2, unless mechanical ventilation is provided.(3) BASEMENTS AND CRAWL SPACES. Where basement and crawl space walls are part of the dwelling thermal envelope, their R-values and U-factors shall be based on the wall components. Adjacent soil may not be considered in the determination.(4) GARAGES. (a) Except as provided under par. (b), a garage may not be provided with any supplemental heat unless all of the following conditions are met: Note: Because of the scope of this chapter, the requirements under this subsection apply only to heat generated from non-renewable sources.
1. The dwelling shall be thermally isolated from the garage.2. The garage floor, ceiling and walls shall be provided with a vapor retarder in accordance with s. SPS 322.38.3. All building elements shall meet the requirements of s. SPS 322.31.(b) The thermal envelope requirements under par. (a) are not required if all of the following conditions are met: 1. The thermostat is permanently limited to a maximum of 50°F.2. Heating equipment is either separate from the dwelling unit equipment or installed as a separate zone.3. Separate heating equipment shall be sized to provide a maximum indoor temperature of 50°F.(5) MASONRY VENEER. When insulation is placed on the exterior of a foundation supporting a masonry veneer exterior, the horizontal foundation surface supporting the veneer is not required to be insulated to satisfy the foundation insulation requirement.Wis. Admin. Code Department of Safety and Professional Services § SPS 322.30
CR 08-043: cr. Register March 2009 No. 639, eff. 4-1-09; correction in (4) (a) 2., 3. made under s. 13.92(4) (b) 7, Stats., Register December 2011 No. 672.