SPS 322.33(1) (1)Heated or unheated slabs.
SPS 322.33(1)(a)(a) 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, except as provided in par. (b).
SPS 322.33(1)(b) (b) At the threshold or the base of any door opening that leads directly to the exterior of the structure, the vertical perimeter insulation shall be at least R-5, excluding all garage doors.
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(3)(c) (c) Insulation on a foundation wall for a basement may be interrupted at the junction with a foundation wall.
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; CR 15-041: renum. (1) to (1) (a) and am., cr. (1) (b), (3) (c) Register December 2015 No. 720, eff. 1-1-16.
SPS 322.34 SPS 322.34Crawl 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 and sealed to the foundation wall or insulation.
SPS 322.34(3) (3)crawl spaces.
SPS 322.34(3)(a)(a) Crawl space walls shall be insulated in accordance with Table 322.31-1.
SPS 322.34(3)(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 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; CR 15-041: am. (2) (d) Register December 2015 No. 720, eff. 1-1-16; CR 15-090: r. (3), (4) (c), renum. (4) to (3) and am. Register May 2016 No. 725, eff. 6-1-16.
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 322.37Air 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(6) (6)Compliance demonstration. Building envelope air tightness and insulation installation shall be demonstrated to comply with one of the following options:
SPS 322.37(6)(a) (a) Testing option. Building envelope tightness and insulation installation shall be considered acceptable when tested air leakage is less than seven air changes per hour (ACH) when tested with a blower door at a pressure of 33.5 psf (50 Pa). Testing shall occur after rough in and after installation of penetrations of the building envelope, including penetrations for utilities, plumbing, electrical, ventilation and combustion appliances. During testing all of the following shall be done:
SPS 322.37(6)(a)1. 1. Exterior windows and doors, fireplace and stove doors shall be closed, but not sealed.
SPS 322.37(6)(a)2. 2. Dampers shall be closed, but not sealed, including exhaust, intake, makeup air, backdraft and flue dampers.
SPS 322.37(6)(a)3. 3. Interior doors shall be open.
SPS 322.37(6)(a)4. 4. Exterior openings for continuous ventilation systems and heat recovery ventilators shall be closed and sealed.
SPS 322.37(6)(a)5. 5. Heating and cooling system(s) shall be turned off.
SPS 322.37(6)(a)6. 6. HVAC ducts shall not be sealed.
SPS 322.37(6)(a)7. 7. Supply and return registers shall not be sealed.
SPS 322.37(6)(b) (b) Visual inspection option. Building envelope tightness and insulation installation shall be considered acceptable when the items listed in Table 332.37, applicable to the method of construction, are field verified. Where required by the code official, an approved party independent from the installer of the insulation shall inspect the air barrier and insulation. - See PDF for table PDF
SPS 322.37 History History: CR 08-043: cr. Register March 2009 No. 639, eff. 4-1-09; CR 15-041: cr. (6), Table 322.37 Register December 2015 No. 720, eff. 1-1-16; correction in (6) (a) 6. made under s. 35.17, Stats., Register December 2015 No. 720.
SPS 322.38 SPS 322.38Vapor 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.
SPS 322.38(1)(b)1.1. 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, except as provided in subd. 2. Rips, punctures, and voids in the vapor retarder shall be patched with vapor retarder materials and taped or sealed. Seams that are not over a framing member shall be taped or sealed.
SPS 322.38(1)(b)2. 2. Taping or sealing a vapor retarder is not required around doors and windows, behind bathtub enclosures, and at top and bottom wall plates, if the retarder is held to those materials in an airtight manner by other building components, such as gypsum wallboard.
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 have at least 50% of the required R-value provided by spray-applied foam having a perm rating of 1.0 or less, unless required by the foam manufacturer.
SPS 322.38(2)(c)5. 5. A vapor retarder for a floor over an open, unheated area may consist of 5/8-inch tongue-and-groove oriented-strand board, or 3/4-inch tongue-and-groove CDX plywood, which is exposure-rated plywood.
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.
SPS 322.38(3)(b) (b) Vapor retarder material shall be at least 6 mils in thickness or shall be a reinforced material.
SPS 322.38(3)(c) (c) Joints in the vapor retarder shall be overlapped at least 6 inches and taped or sealed.
SPS 322.38(3)(d) (d) A vapor retarder is not required under the slab of an unconditioned attached garage.
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.