a R−values are minimums. U−factors are maximums.
b The first R−value applies to continuous insulation. The second R−value applies to framing cavity insulation. Either insulation meets the requirement. “15/19” means R-15 continuous insulated sheathing on the interior or exterior of the home or R-19 cavity insulation at the interior of the basement wall. “15/19” shall be permitted to be met with R-13 cavity insulation on the interior of the basement wall plus R-5 continuous insulated sheathing on the interior or exterior of the home. “10/13” means R-10 continuous insulated sheathing on the interior or exterior of the home or R-13 cavity insulation at the interior of the basement wall.
c The first R−value applies under the entire slab, regardless of depth below grade. The second R−value applies to the slab edge where the bottom of the slab is less than 12 inches below adjacent grade. Slab edge insulation shall extend downward from the top of the slab for a minimum of 48 inches or downward to at least the bottom of the slab and then horizontally to the interior or exterior for a minimum total distance of 48 inches. Also, see s. SPS 321.16 for protection against frost for slabs with supports less than 4 feet below grade. d The R−value applies to any slab, the bottom of which is less than 12 inches below adjacent grade. Also, see s. SPS 321.16 for protection against frost for slabs with supports less than 4 feet below grade. e See s. SPS 322.32 (1) for application and permitted reduced R−value. f R-19 R-20 and R-21 may be compressed into a 2X6 cavity.
g “13+5” means R−13 cavity insulation plus R−5 insulated sheathing. If structural sheathing covers 25% or less of the exterior, insulating sheathing is not required where structural sheathing is used. If structural sheathing covers more than 25% of the exterior, structural sheathing shall be covered with insulated sheathing of at least R−2.
h Or insulation sufficient to fill the framing cavity with a minimum of R−19.
i The second R-value applies when more than half of the insulation is on the interior of the mass wall.
SECTION 97.
SPS 322.31 Table 322.31–2 is amended to read:TABLE 322.31-2
EQUIVALENT U-FACTORS
Zone | Fenestration U-Factor | Skylight U-Factor | Ceiling U-Factor | Wood Frame Wall U-Factor | Mass Wall U-Factor | Floor U-Factor | Basement Wall U-Factor | Crawl Space Wall U-Factor | Unheated Slab U-Factor |
1 | 0.35 | 0.60 | 0.026 | 0.060 0.057 | 0.060a | 0.033 | 0.065 0.050 | 0.065 | 10 |
2 | 0.35 | 0.60 | 0.026 | 0.057 | 0.057a | 0.033 0.028 | 0.065 0.050 | 0.065 | 10 |
a When more than half the insulation is on the interior, the mass wall U-factors shall be the same as the frame wall U-factor.
SECTION 98.
SPS 322.31 Table 322.31–4 is amended to read:TABLE 322.31-4
COMPONENT DWELLING THERMAL ENVELOPE REQUIREMENTS
FOR DWELLINGS USING LOWER EFFICIENCY APPLIANCESa
Fenestration U-Factor | Skylight U-Factor | Ceiling R-Value | Wood Frame Wall R-Value | Mass Wall R-Value | Floor R-Value | Basement or Crawl Space Wall R-Valueb | Heated Slab R-Valuec | Unheated Slab R-Valued |
0.30 | 0.60 | 49e | 21f or 19+5g | 19 | 30h | 15/19 | 10/20 | 15 |
0.30 | 0.60 | 0.26* 0.026 | 0.057 | 0.057 | 0.033 | 0.045 | 0.033 | 0.047 |
* Note: The correct number is .026. An error was discovered in the rule order after completion of the rule−making process.
a R−values are minimums. U−factors are maximums.
b The first R−value applies to continuous insulation. The second R−value applies to framing cavity insulation.
c The first R−value applies under the entire slab, regardless of depth below grade. The second R−value applies to the slab edge. Slab edge insulation shall extend downward from the top of the slab for a minimum of 48 inches or downward to at least the bottom of the slab and then horizontally to the interior or exterior for a minimum total distance of 48 inches.
d The R−value applies to the slab perimeter insulation, where the bottom of the slab is less than 12 inches below adjacent grade. Slab edge insulation shall extend downward from the top of the slab for a minimum of 48 inches or downward to at least the bottom of the slab and then horizontally to the interior or exterior for a minimum total distance of 48 inches. Also, see s. SPS 321.16 for protection against frost for slabs with supports less than 4 feet below grade. e See s. SPS 322.32 (1) for application and permitted reduced R−value. f R−21 may be compressed into a 2X6 cavity.
g “19+5” means R−19 cavity insulation plus R−5 insulated sheathing. If structural sheathing covers 25% or less of the exterior, insulating sheathing is not required where structural sheathing is used. If structural sheathing covers more than 25% of the exterior, structural sheathing shall be covered with insulated sheathing of at least R−2.
h Or insulation sufficient to fill the framing cavity with a minimum of R−19.
SECTION 99.
SPS 322.31 Table 322.31–4 (Note) is repealed.SECTION 100.
SPS 322.31 (2) (b) (Note) is repealed.SECTION 101.
SPS 322.32 (1) is renumbered SPS 322.32 (1) (a).SECTION 102.
SPS 322.32 (1) (b) is created to read: SPS 322.32 (1) (b) An attic-access cover shall be weatherstripped and insulated to a level equivalent to the insulation on the surrounding surfaces when the attic is an unconditioned space. A wood framed or equivalent baffle or retainer is required to be provided when loose fill insulation is installed, the purpose of which is to prevent loose fill insulation from spilling into the living space when the attic access is opened, and to provide a permanent means of maintaining the installed R-value of the loose fill insulation.
SECTION 103.
SPS 322.32 (3) (b) is repealed.SECTION 104.
SPS 322.32 (3) (title) and (a) are consolidated, renumbered, and amended to read: SPS 322.32 (3) Mass walls. (a) The requirements of Table 322.31-1 are applicable in a to mass wall walls where at least 50 percent of the required insulation R-value is on the exterior of, or integral to, the wall.
SECTION 105.
SPS 322.32 (9) is renumbered SPS 322.32 (9) (a).SECTION 106.
SPS 322.32 (9) (b) is created to read: SPS 322.32 (9) (b) The vertical and flared walls in a skylight shall meet the insulation requirements for walls. Tube skylights shall be insulated per the manufacturer’s recommendations.
SECTION 107.
SPS 322.33 (1) is renumbered SPS 322.33 (1) (a) and amended to read: SPS 322.33 (1) (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).
SECTION 108.
SPS 322.33 (1) (b) and (3) (c) are created to read: SPS 322.33 (1) (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.
(3) (c) Insulation on a foundation wall for a basement may be interrupted at the junction with a foundation wall.
SECTION 109.
SPS 322.34 (2) (d) is amended to read: SPS 322.34 (2) (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.
SECTION 110.
SPS 322.37 (6) (intro), (a) 1. to 7. and (b) are created to read: SPS 322.37 (6) Compliance Demonstration. Building envelope air
tightness and insulation installation shall be demonstrated to comply with one of the following options:
(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:
