Section 322.36. Fenestration.

 

(1)   Average U-factors. An area-weighted average of fenestration products may be used to satisfy the U-factor requirements.

(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.

(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.

(4)   Opaque door exemption. One opaque door assembly is exempted from the U-factor requirements of this chapter.

(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.

(6)  C ertified 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.

(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

a Glass block assemblies shall have a default value of 0.60. - See PDF for table

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 .