Section 367.11. Energy efficiency requirements.

 

(1)   Insulation.

(a) R-value . For the purpose of this section, the R-value applies only to the amount of insulation. The R-value does not refer to the total overall R-values of all components of an assembly such as framework, finish materials or air films.

(b) Insulation of attic areas and access panels or doors. Insulation shall be provided in all accessible areas as specified in Table 367.11-1. - See PDF for table

(c) Insulation of box sills. Insulation shall be provided in all accessible areas that form a portion of the thermal envelope as specified in Table 367.11-2. - See PDF for table

(d) Insulation of ducts and pipes. Insulation shall be provided in all accessible vented crawl spaces and attic spaces as specified in Table 367.11-3. - See PDF for table

(2)   Windows and doors.

(a) General. Except as specified in sub. (3) , windows and doors shall comply with this subsection.

(b) Windows.

1. Except as provided in subd. 2. , windows shall be double-glazed or shall be provided with exterior or interior storm windows. The glazed or glass areas of storm windows shall be caulked or sealed to minimize air leakage.

2.

a. Storefront windows are not required to be double-glazed.

b. When an exterior storm window is installed over an openable window required for natural ventilation, a portion of the storm window shall be openable from the inside.

c. Windows located in boiler or furnace rooms do not need to be double-glazed or equipped with storm windows.

d. Windows located in basement areas that are not habitable rooms may be permanently sealed and insulated in lieu of double-glazing or installing exterior or interior storm windows.

(c) Doors. Patio doors shall be insulated, double-glazed or equipped with storm doors. Where no vestibule exists, inward swinging exterior doors shall be insulated, double-glazed or equipped with storm doors. Door lites need not be double-glazed if they are within the door leaf. All storm doors shall be equipped with self-closing devices. All accessible joints and cracks in storm doors shall be caulked or otherwise sealed.

(3)   Blower door test.

(a) Except as specified in par. (b) , storm windows and doors are not required when blower door testing shows that the natural air change rate of the thermal envelope is 1.0 air change per hour or less.

(b) Testing done on any date prior to certification shall be acceptable, provided no change has occurred to the building that would impact the test results in a negative or indeterminate way.

(4)   Moisture control.

(a) Ceilings. Ventilation shall be provided above any ceiling or attic insulation. The free area of ventilation shall be at least 1/300 of the horizontal area. Where overhangs with soffits are provided, one-half of the free-area shall be at the eaves and one-half in the upper one-third of the roof or gable. Where it is impractical to install gravity venting, power vent systems may be used to provide equivalent ventilation. Power vents shall be connected to a humidistat.

(b) Crawl spaces. Ventilation shall be provided in the crawl space. The area of ventilation shall be at least 1/300 of the floor space. The area of ventilation shall be distributed equally to at least 2 openings in the foundation wall. The openings shall be located to provide cross ventilation. Where accessible, a vapor barrier shall be applied to cover the exposed earth.

(5)   Equipment.

(a) Combustion air. Combustion air openings shall be unobstructed.

(b) Flow restricters. All showers heads shall be equipped with flow restricters rated at three gallons per minute or less.

History: CR 07-008 : cr. Register April 2008 No. 628 , eff. 5-1-08; correction in (2) (c) made under s. 13.92 (4) (b) 1. , Stats., Register April 2008 No. 628 ; correction in (1) (b), (c), (d) made under s. 13.92 (4) (b) 7. , Stats., Register December 2011 No. 672 .

Note

Blower door testing may be conducted in accordance with ASTM E779, "Standard Practice for Measuring Air Leakage by the Fan Pressurization Method." Microsoft Windows NT 6.1.7601 Service Pack 1