SPS 322.32(5) (5)Floors. Floor insulation shall be installed to maintain permanent contact with the underside of the subfloor decking.
SPS 322.32(6) (6)Basement walls.
SPS 322.32(6)(a)(a) Walls associated with conditioned basements shall be insulated from the top of the basement wall down to the basement floor.
SPS 322.32(6)(b) (b) Walls associated with unconditioned basements shall meet the requirement in par. (a) unless the floor overhead is insulated in accordance with Table 322.31-1.
SPS 322.32(6)(c) (c) Where the total basement wall area is less than 50 percent below grade, the entire wall area, including the below-grade portion, is included as part of the area of exterior walls.
SPS 322.32(7) (7)Box sill and rim joist spaces. Box sills and joist spaces at outside walls shall be insulated to the required wall R-value with air-impermeable insulation that is sealed on all sides to all framing members and the foundation, or with air-permeable insulation held in place as required under s. SPS 322.21 (1).
SPS 322.32(8) (8)Overhang joist spaces.
SPS 322.32(8)(a)(a) Joist spaces that extend beyond exterior walls shall be insulated with an R-value of 30 or higher with insulation that completely fills the cavity including over the top of the exterior wall supporting the joists.
SPS 322.32(8)(b) (b) The joist space insulation shall be air sealed either by using an air-impermeable insulation that is sealed to all framing members or by covering the insulation with a rigid material that is caulked or sealed to all framing members.
SPS 322.32(8)(c) (c) If piping that is subject to freezing is located in the joist space, additional insulation shall be provided on the unconditioned side of the space.
SPS 322.32(9) (9)Wall insulation. Except for closed-cell sprayed foam, wall insulation shall completely fill the wall cavity. - See PDF for table PDF
SPS 322.32 History History: CR 08-043: cr. Register March 2009 No. 639, eff. 4-1-09; correction in (3) (a), (b), (4) (a), (6) (b), (7) made under s. 13.92 (4) (b) 7., Stats., Register December 2011 No. 672.
SPS 322.33 SPS 322.33 Slab floors.
SPS 322.33(1)(1) Heated or unheated slabs. Any heated or unheated slab floor, the bottom of which is less than 12 inches below adjacent grade, shall be provided with perimeter insulation in accordance with Table 322.31-1 or Table 322.31-4.
SPS 322.33(2) (2)Heated slabs. In addition to meeting the requirement under sub. (1), if applicable, heated slab floors of any depth below grade shall meet the under-slab R-value requirement in accordance with Table 322.31-1 or Table 322.31-4.
SPS 322.33(3) (3)Details.
SPS 322.33(3)(a)(a) The top edge of insulation installed between the exterior wall and the edge of the interior slab may be cut at a 45 degree angle away from the exterior wall.
SPS 322.33(3)(b) (b) Horizontal insulation extending outside of the foundation shall be covered by soil a minimum of 10 inches thick or by pavement.
SPS 322.33 Note Note: See Appendix for further explanatory materials.
SPS 322.33 History History: CR 08-043: cr. Register March 2009 No. 639, eff. 4-1-09; CR 09-104: am. (1), (2) Register December 2010 No. 660, eff. 1-1-11; correction in (1), (2) made under s. 13.92 (4) (b) 7., Stats., Register December 2011 No. 672.
SPS 322.34 SPS 322.34 Crawl spaces.
SPS 322.34(1)(1) Frost protection. If the bottom of the crawl space serving as the dwelling foundation is less than 48 inches below adjacent grade, the foundation shall be frost protected in accordance with Table 322.31-1 for frost protected slabs.
SPS 322.34(2) (2)Vapor retarder. Any exposed earth in crawl spaces shall be covered with a continuous vapor retarder.
SPS 322.34(2)(b) (b) All decayable organic material, including topsoil, shall be removed from crawl space floors prior to placing the vapor retarder.
SPS 322.34(2)(c) (c) All joints of the vapor retarder shall overlap by 6 inches and be sealed or taped.
SPS 322.34(2)(d) (d) The edges of the vapor retarder shall extend at least 6 inches up the foundation wall and shall be attached to the foundation wall.
SPS 322.34(3) (3)Uninsulated crawl spaces.
SPS 322.34(3)(a)(a) For crawl spaces that are outside of the thermal envelope, ventilation openings equal to at least 1/1500 of the floor space shall be provided.
SPS 322.34(3)(b) (b) At least 50% of the ventilating area shall be provided at opposite sides of the crawl space or as far apart as possible.
SPS 322.34(3)(c) (c) The floor above the crawl space shall be insulated in accordance with Table 322.31-1.
SPS 322.34(4) (4)Insulated crawl spaces.
SPS 322.34(4)(a)(a) As an alternative to insulating floors over unheated crawl spaces, crawl space walls shall be insulated in accordance with Table 322.31-1.
SPS 322.34(4)(b) (b) Crawl space wall insulation shall be permanently fastened to the wall and shall extend the entire height of the wall.
SPS 322.34(4)(c) (c) The crawl space may not be vented to the outside unless the floor above is insulated in accordance with Table 322.31-1.
SPS 322.34 History History: CR 08-043: cr. Register March 2009 No. 639, eff. 4-1-09; correction in (1), (3) (c), (4) (a), (c) made under s. 13.92 (4) (b) 7., Stats., Register December 2011 No. 672.
SPS 322.35 SPS 322.35Thermally isolated sunrooms.
SPS 322.35(1)(1) The minimum opaque ceiling insulation R-value shall be R-24. The minimum opaque wall R-value shall be R-13.
SPS 322.35(2) (2) The maximum fenestration U-factor shall be 0.50 and the maximum skylight U-factor shall be 0.75.
SPS 322.35(3) (3) New walls, windows and doors separating a sunroom from conditioned space shall meet the building thermal envelope requirements.
SPS 322.35(4) (4) The temperature in the conditioned space shall be controlled as a separate zone or shall use separate heating equipment.
SPS 322.35(5) (5) Glazing in a thermally-isolated sunroom is not considered to be in the dwelling thermal envelope.
SPS 322.35 History History: CR 08-043: cr. Register March 2009 No. 639, eff. 4-1-09.
SPS 322.36 SPS 322.36Fenestration.
SPS 322.36(1)(1) Average U-factors. An area-weighted average of fenestration products may be used to satisfy the U-factor requirements.
SPS 322.36(2) (2)Maximum fenestration U-factor. The area weighted average maximum fenestration U-factor permitted using trade offs from s. SPS 322.31 (2) or subchapter VI shall be 0.40 for vertical fenestration, and 0.75 for skylights.
SPS 322.36(3) (3)Glazed fenestration exemption. Up to 15 square feet of glazed fenestration per dwelling unit may be exempt from U-factor requirements of the chapter.
SPS 322.36(4) (4)Opaque door exemption. One opaque door assembly is exempted from the U-factor requirements of this chapter.
SPS 322.36(5) (5)Replacement fenestration. Where an existing fenestration unit is replaced with a new fenestration unit, including sash and glazing, the replacement unit shall meet the U-factor requirements of this chapter.
SPS 322.36(6) (6) Certified products. Except as provided in sub. (7), fenestration rating, certification and labeling of U-factors for windows, doors and skylights shall be in accordance with NFRC 100.
SPS 322.36(7) (7)Default values. When a manufacturer has not determined product U-factor in accordance with NFRC 100, U-factors shall be determined by assigning a default value in accordance with Tables 322.36-1 and 322.36-2. Where a composite of materials of two different product types is used, the product shall be assigned the higher U-factor. - See PDF for table PDF
a Glass block assemblies shall have a default value of 0.60. - See PDF for table PDF
SPS 322.36 History History: CR 08-043: cr. Register March 2009 No. 639, eff. 4-1-09; correction in (2), (7) made under s. 13.92 (4) (b) 7., Stats., Register December 2011 No. 672.
SPS 322.37 SPS 322.37 Air leakage.
SPS 322.37(1)(1) General. The requirements of this section apply to those components that separate interior conditioned space from a garage or an unconditioned space.
SPS 322.37(2) (2)Window and door assemblies.
SPS 322.37(2)(a)(a) General. Except as specified in par. (b), windows, skylights and sliding glass doors shall have an air infiltration rate of no more than 0.3 cfm per square foot, and swinging doors no more than 0.5 cfm per square foot, when tested according to NFRC 400 or AAMA/WDMA/CSA 101/I.S.2/A440 by an accredited, independent laboratory and listed and labeled by the manufacturer.
SPS 322.37(2)(b) (b) Exception. Site-constructed doors and windows shall be sealed with gasketing or weatherstripping or shall be covered with a storm door or storm window.
SPS 322.37(3) (3)Joint and penetration sealing.
SPS 322.37(3)(a)(a) Exterior joints, seams or penetrations in the dwelling envelope, which are sources of air leakage, shall be sealed with durable caulking materials, closed with gasketing systems, taped, or covered with water-vapor-permeable house wrap. Joints to be treated include all of the following:
SPS 322.37(3)(a)1. 1. Openings, cracks and joints between wall cavities and window or door frames.
SPS 322.37(3)(a)2. 2. Between separate wall assemblies or their sill-plates and foundations.
SPS 322.37(3)(a)3. 3. Between walls, roof, ceilings or attic ceiling seals, and between separate wall panel assemblies, including between interior and exterior walls.
SPS 322.37(3)(a)4. 4. Penetrations of utility services through walls, floor and roof assemblies, and penetrations through top and bottom wall plates.
SPS 322.37(3)(b) (b) Sealing shall be provided at the attic and crawl space panels, at recessed lights and around all plumbing and electrical penetrations, where these openings are located in the dwelling thermal envelope.
SPS 322.37(3)(c) (c) The sealing methods between dissimilar materials shall allow for differential expansion and contraction.
SPS 322.37(4) (4)Recessed lighting. When installed in the dwelling envelope, recessed lighting fixtures shall be sealed to limit air leakage between conditioned and unconditioned spaces by one of the following means:
SPS 322.37(4)(a) (a) The fixture shall be IC-rated and labeled with enclosures that are sealed or gasketed to prevent air leakage to the ceiling cavity or unconditioned space.
SPS 322.37(4)(b) (b) The fixture shall be IC-rated and labeled as meeting ASTM E 283 when tested at 1.57 psi pressure differential with no more than 2.0 cfm of air movement from the conditioned space to the ceiling cavity.
SPS 322.37(4)(c)1.1. The fixture shall be located inside an airtight sealed box with clearances of at least 0.5 inch from combustible material and 3 inches from insulation.
SPS 322.37(4)(c)2. 2. If the fixture is non-IC-rated, the box shall be constructed of noncombustible material that does not readily conduct heat.
SPS 322.37 Note Note: The department will accept cement board, drywall, and other materials that exhibit flame spread and smoke developed indices of 10 or less when tested in accordance with ASTM E-84.
SPS 322.37(5) (5)Fan housings. Gaps between a fan housing and a ceiling or wall that could result in air leaks shall be gasketed, sealed or caulked.
SPS 322.37 History History: CR 08-043: cr. Register March 2009 No. 639, eff. 4-1-09.
SPS 322.38 SPS 322.38 Vapor retarders.
SPS 322.38(1)(1) General.
SPS 322.38(1)(a)(a) Definition. Under this section, a vapor retarder is a material with no intrinsic thermal or structural properties that has a rating of 1.0 perm or less when tested in accordance with ASTM standard E 96, Procedure A.
SPS 322.38(1)(b) (b) Continuity. The vapor retarder shall be continuous. All joints in a vapor retarder consisting of sheet material shall be overlapped 6 inches and taped or sealed. Rips, punctures and voids in the vapor retarder shall be patched with vapor retarder materials and taped or sealed.
SPS 322.38(2) (2)Frame assemblies.
SPS 322.38(2)(a)(a) General. Except as provided under par. (c), all frame walls, frame floors and frame ceilings that comprise the thermal envelope, shall have a vapor retarder installed on the warm-in-winter side of the thermal insulation.
SPS 322.38(2)(b) (b) Coverage. The vapor retarder shall cover the exposed insulation and the interior face of the framing.
SPS 322.38(2)(c) (c) Exceptions.
SPS 322.38(2)(c)1.1. Where the vapor retarder is omitted, as allowed under subds. 2. to 4., all sources of air leakage, such as between double top or bottom plates or between double studs, shall be caulked or sealed.
SPS 322.38(2)(c)2. 2. No vapor retarder is required in the box sill.
SPS 322.38(2)(c)3. 3. No vapor retarder is required where batt insulation is provided with foil or kraft paper backing on the warm-in-winter side and the nailing tabs are tightly fastened to the warm-in-winter face of the framing members.
SPS 322.38(2)(c)4. 4. No vapor retarder is required over cavities that are insulated solely with spray-applied foam unless required by the foam manufacturer.
SPS 322.38 Note Note: This requirement does not require the cavity to be completely filled. It only requires that the total required R-value come from the foam, including any exterior foam sheathing, and no other insulation material is present in the cavity.
SPS 322.38(3) (3)Concrete floors.
SPS 322.38(3)(a)(a) Except as allowed under par. (d), a vapor retarder shall be installed directly under the concrete floor slab or under the base course of concrete floor slabs.
Published under s. 35.93, Stats. Updated on the first day of each month. Entire code is always current. The Register date on each page is the date the chapter was last published.