SPS 322.42(1)
(1) Supply and return heating ducts, or portions thereof, that are not located completely within the thermal envelope, shall be provided with insulation with a thermal resistance of at least R-8.
SPS 322.42(1m)
(1m) Cooling supply ducts that pass through unconditioned spaces conducive to condensation, such as attics, shall be provided with insulation having a thermal resistance of at least R–8. The exterior of that insulation shall be covered with a vapor retarder that meets the requirements in
s. SPS 322.38 (1)
SPS 322.42(2)
(2) Building framing cavities may not be used as supply ducts.
SPS 322.43(1)
(1) Duct systems with joints not located entirely within the conditioned space or with joints located on the unconditioned side of stud bays, joist cavities and similar spaces, shall be sealed in accordance with this section.
SPS 322.43(2)
(2) Sealing shall be accomplished using welds, gaskets, mastics, mastic-plus-embedded-fabric systems or tapes installed in accordance with the manufacturer's instructions.
SPS 322.43(3)
(3) Insulation that provides a continuous air barrier may be used in lieu of sealing metal ducts.
SPS 322.43(4)
(4) Tapes and mastics used with rigid fibrous glass ducts shall be listed and labeled as complying with UL 181A.
SPS 322.43(5)
(5) Tapes and mastics used with flexible air ducts shall be listed and labeled as complying with UL 181B.
SPS 322.43(6)
(6) Tapes with rubber-based adhesives may not be used.
SPS 322.43(7)
(7) Except where exempted as indicated in
sub. (8), duct tightness shall be verified by either of the following:
SPS 322.43(7)(a)
(a) Postconstruction test: Leakage to outdoors shall be less than or equal to 8 cfm per 100 ft
2 of conditioned floor area or a total leakage less than or equal to 12 cfm per 100 ft
2 of conditioned floor area when tested at a pressure differential of 0.1 inches w.g. (25 Pa) across the entire system, including the manufacturer's air handler enclosure. All register boots shall be taped or otherwise sealed during the test.
SPS 322.43(7)(b)
(b) Rough-in test: Total leakage shall be less than or equal to 6 cfm per 100 ft
2 of conditioned floor area when tested at a pressure differential of 0.1 inches w.c. (25 Pa) across the roughed in system, including the manufacturer's air handler enclosure. All register boots shall be taped or otherwise sealed during the test. If the air handler is not installed at the time of the test, total leakage shall be less than or equal to 4 cfm per 100 ft
2 of conditioned floor area.
SPS 322.43(8)
(8) A duct tightness test is not required if the air handler and all ducts are located within conditioned space.
SPS 322.43 Note
Note: Standard duct tape or “duck tape" has a rubber-based adhesive and does not comply with the requirements of this section.
SPS 322.43 History
History: CR 08-043: cr.
Register March 2009 No. 639, eff. 4-1-09;
CR 15-041: cr. (7), (8)
Register December 2015 No. 720, eff. 1-1-16; numbering correction in (7) made under s.
13.92 (4) (b) 1., Stats., and correction in (7) (intro.), (b) made under s.
35.17, Stats.,
Register December 720, eff. 1-1-16.
SPS 322.44(1)
(1) Mechanical system piping capable of carrying fluids above 105
°F (41
°C) or below 55
°F (13
°C) shall be insulated to a minimum of R-3.
SPS 322.44(2)
(2) All circulating service hot water piping shall be insulated to at least R-2. Circulating hot water systems shall include an automatic or readily accessible manual switch that can turn off the hotwater circulating pump when the system is not in use.
SPS 322.44(3)
(3) Heating pipes in unheated spaces shall be insulated with material providing a minimum thermal resistance of R-4 as measured on a flat surface in accordance with ASTM standard C 335 at a mean temperature of 75
°F.
SPS 322.44 History
History: CR 08-043: cr.
Register March 2009 No. 639, eff. 4-1-09;
CR 15-041: renum. 322.44 to 322.44 (3), cr. (1), (2)
Register December 2015 No. 720, eff. 1-1-16.
SPS 322.45
SPS 322.45 Air conditioner and heat pump efficiencies. SPS 322.45(1)(1) Heating and cooling equipment shall meet the minimum efficiency requirements in Table 322.45 when tested and rated in accordance with the applicable test procedure.
SPS 322.45(2)
(2) The efficiency shall be verified through certification under an approved certification program or, if no certification program exists, the equipment efficiency ratings shall be supported by data furnished by the manufacturer.
SPS 322.45(3)
(3) Where multiple rating conditions or performance requirements are provided, the equipment shall satisfy all efficiency requirements under this chapter.
SPS 322.45(4)
(4) Where components, such as indoor or outdoor coils, from different manufacturers are used, calculations and supporting data shall be furnished by the designer that demonstrate that the combined efficiency of the specified components meets the requirements under this section.
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See PDF for table 
SPS 322.45 History
History: CR 08-043: cr.
Register March 2009 No. 639, eff. 4-1-09; correction in (1) made under s.
13.92 (4) (b) 7., Stats.,
Register December 2011 No. 672.
SPS 322.46
SPS 322.46 Replacement furnace and boiler efficiencies. SPS 322.46(1)(1) A replacement furnace in existing construction may meet only the prevailing federal efficiency standard provided the duct distribution system is sealed and tested at 0.02 inches water gage across the entire system, including the manufacturer's air handler enclosure, to have air leakage less than 10 percent of the furnace manufacturer's rated air flow across the blower at high speed.
SPS 322.46 Note
Note: 0.02 inches water gage is equal to approximately 25 pascals.
SPS 322.46(2)
(2) A replacement boiler in existing construction may meet only the prevailing federal standard provided there is no installed circulation pump larger than
1/
20 horsepower and no circulation pump runs continuously.
SPS 322.46 History
History: CR 08-043: cr.
Register March 2009 No. 639, eff. 4-1-09.
SPS 322.47(1)(1) Mechanical ventilation outdoor air intakes and exhausts shall have automatic or gravity dampers that close when the ventilation system is not operating.
SPS 322.47(2)
(2) Snow melt system controls. Snow- and ice-melting systems, supplied through energy service to the building, shall include automatic controls capable of shutting off the system when the pavement temperature is above 50
°F, and no precipitation is falling and an automatic or manual control that will allow shutoff when the outdoor temperature is above 40
°F.
SPS 322.47 History
History: CR 15-041: cr.
Register December 2015 No. 720, eff. 1-1-16.
SPS 322.48
SPS 322.48 Indoor Pools. Indoor pools shall be provided with energy-conserving measures in accordance with all of the following:
SPS 322.48(1)
(1) Pool heaters. All pool heaters shall be equipped with a readily accessible on-off switch to allow shutting off the heater without adjusting the thermostat setting. Pool heaters fired by natural gas shall not have continuously burning pilot lights.
SPS 322.48(2)(a)(a) Except where allowed in
pars. (b) and
(c), time switches that can automatically turn off and on heaters and pumps according to a preset schedule shall be installed on swimming pool heaters and pumps.
SPS 322.48(2)(b)
(b) Where public health standards require 24-hour pump operation, time switches are not required.
SPS 322.48(2)(c)
(c) Where pumps are required to operate solar- and waste-heat-recovery pool heating systems, time switches are not required.
SPS 322.48 History
History: CR 15-041: cr.
Register December 2015 No. 720, eff. 1-1-16.
SPS 322.49
SPS 322.49 Lighting Equipment. A minimum of 50 percent of the lamps in permanently installed lighting fixtures shall be high-efficacy lamps.
SPS 322.49 History
History: CR 15-041: cr.
Register December 2015 No. 720, eff. 1-1-16.
SPS 322.50
SPS 322.50 General. This subchapter establishes criteria for compliance using simulated energy performance analysis. The analysis shall include heating, cooling, and service water heating energy only.
SPS 322.50 History
History: CR 08-043: cr.
Register March 2009 No. 639, eff. 4-1-09.
SPS 322.51
SPS 322.51 Performance-based compliance. Compliance based on simulated energy performance requires that a proposed dwelling be shown to have an annual energy cost that is less than or equal to the annual energy cost of the standard reference design.
SPS 322.51 History
History: CR 08-043: cr.
Register March 2009 No. 639, eff. 4-1-09.
SPS 322.52(1)
(1)
Compliance software tools. Documentation verifying that the methods and accuracy of the compliance software tools conform to the provisions of this subchapter shall be provided to the inspector.
SPS 322.52 Note
Note: REM/Rate is an acceptable software program for determining compliance with this section.
SPS 322.52(2)
(2) Compliance report. Compliance software tools shall generate a report that documents that the proposed design has annual energy costs less than or equal to the annual energy costs of the standard reference design. The compliance documentation shall include all of the following information:
SPS 322.52(2)(b)1.1. An inspection checklist documenting the building component characteristics of the proposed design as listed in Table 322.53-1.
SPS 322.52(2)(b)2.
2. The inspection checklist shall show the estimated annual energy cost for both the standard reference design and the proposed design.
SPS 322.52(3)
(3) Additional documentation. The inspector may require any of the following documents:
SPS 322.52(3)(a)
(a) Documentation of the building component characteristics of the standard reference design.
SPS 322.52(3)(b)
(b) A certification signed by the builder providing the building component characteristics of the proposed design as given in Table 322.53-1.
SPS 322.52 History
History: CR 08-043: cr.
Register March 2009 No. 639, eff. 4-1-09; correction in (2) (b), (3) (b) made under s.
13.92 (4) (b) 7., Stats.,
Register December 2011 No. 672.
SPS 322.53(1)
(1)
General. Except as specifically allowed under this section, the standard reference design and proposed design shall be configured and analyzed using identical methods and techniques.
SPS 322.53(2)
(2) Reference and proposed designs. The standard reference design and proposed design shall be configured and analyzed as specified by Table 322.53-1. Table 322.53-1 shall include by reference all notes contained in Table 322.31-1.
SPS 322.53(3)
(3) Calculation software tools. Calculation procedures used to comply with this section shall be capable of calculating the annual energy consumption of all building elements that differ between the standard reference design and the proposed design and shall include the following capabilities:
SPS 322.53(3)(a)
(a) Computer generation of the standard reference design using only the input for the proposed design. The calculation procedure may not allow the user to directly modify the building component characteristics of the standard reference design.
SPS 322.53(3)(b)
(b) Calculation of whole-building sizing as a single zone for the heating and cooling equipment in the standard reference design residence in accordance with
s. SPS 322.40 (3).
SPS 322.53(3)(c)
(c) Calculations that account for the effects of indoor and outdoor temperatures and part-load ratios on the performance of heating, ventilating and air conditioning equipment based on climate and equipment sizing.
SPS 322.53(3)(d)
(d) Printed code official inspection checklist listing each of the proposed design component characteristics from Table 322.53-1 determined by the analysis to provide compliance, along with their respective performance ratings.
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See PDF for table
a Glazing shall be defined as sunlight-transmitting fenestration, including the area of sash, curbing or other framing elements, that enclose conditioned space. Glazing includes the area of sunlight-transmitting fenestration assemblies in walls bounding conditioned basements. For doors where the sunlight-transmitting opening is less than 50% of the door area, the glazing area is the sunlight transmitting opening area. For all other doors, the glazing area is the rough frame opening area for the door including the door and the frame.
b For residences with conditioned basements, R-2 and R-4 residences and townhouses, the following formula shall be used to determine glazing area: AF = As X FA X F where:
1. AF = Total glazing area.
2. As = Standard reference design total glazing area.
3. FA = (Above-grade thermal boundary gross wall area)/(above-grade boundary wall area + 0.5 x below-grade boundary wall area).
4. F = (Above-grade thermal boundary wall area)/(above-grade thermal boundary wall area + common wall area) or 0.56, whichever is greater.
And where:
5. Thermal boundary wall is any wall that separates conditioned space from unconditioned space or ambient conditions.
6. Above-grade thermal boundary wall is any thermal boundary wall component not in contact with soil.
7. Below-grade boundary wall is any thermal boundary wall in soil contact.
8. Common wall area is the area of walls shared with an adjoining dwelling unit.
c For fenestrations facing within 15 degrees of true south that are directly coupled to thermal storage mass, the winter interior shade fraction may be increased to 0.95 in the proposed design.
d Where Leakage Area (L) is defined in accordance with Section 5.1 of ASHRAE 119 and where: SLA = L/CFA where L and CFA are in the same units.
e Tested envelope leakage shall be determined and documented by an independent party approved by the code official. Hourly calculations as specified in the 2005 ASHRAE Handbook of Fundamentals, Chapter 27, page 27.21, Equation 40, Sherman-Grimsrud model, or the equivalent shall be used to determine the energy loads resulting from infiltration.
f The combined air exchange rate for infiltration and mechanical ventilation shall be determined in accordance with Equation 43 of 2005 ASHRAE Handbook of Fundamentals page 27.23 and the “Whole-house Ventilation" provisions of 2005 ASHRAE Handbook of Fundamentals, page 27.18 for intermittent mechanical ventilation.
