Section 322.31. Prescriptive insulation and fenestration criteria.

 

(1)   Requirements.

(a) Except as specifically provided under this subchapter, dwellings using the prescriptive method shall meet the requirements of Table 322.31-1 or 322.31-2.

(b) In Tables 322.31-1 and 322.31-2, zone 2 consists of the following 15 northern counties: Ashland, Bayfield, Burnett, Douglas, Florence, Forest, Iron, Langlade, Lincoln, Oneida, Price, Sawyer, Taylor, Vilas and Washburn. Zone 1 consists of all other counties not included in zone 2.

(2)   Thermal envelope.

(a) General. If the total dwelling thermal envelope UA is less than or equal to the total UA resulting from using the U-factors in Table 322.31-2 multiplied by the same assembly area as in the proposed building, the dwelling is in compliance with this chapter. The UA calculation shall be done using a method consistent with the ASHRAE Handbook of Fundamentals and shall include the thermal bridging effects of framing materials.

(b) Software version. If a REScheck software program is used to show compliance with this section, a version approved by the department shall be used.

(3)   Appliance efficiency.

(a) Except as allowed under par. (b) and s. SPS 322.46 , oil-fired and gas-fired furnaces and boilers shall meet the minimum efficiency requirements in Table 322.31-3.

(b) In new construction, an oil-fired or gas-fired furnace or boiler meeting the federal efficiency standard but not the requirements of Table 322.31-3 may be installed if the dwelling thermal envelope requirements of Table 322.31-4 are met.

CR 08-043 : cr. Register March 2009 No. 639 , eff. 4-1-09; EmR0917 : emerg. am. (2) (b), eff. 9-5-09; CR 09-072 : am. (2) (b) Register March 2010 No. 651 , eff. 4-1-10; CR 09-104 : am. Tables 22.31-1 and 22.31-4 Register December 2010 No. 660 , eff. 1-1-11; correction in (1) (a), (b), (2) (a), (b), (3) (a), (b), Table 322.31-1, Table 322.31-4 made under s. 13.92 (4) (b) 7. , Stats., Register December 2011 No. 672 l; CR 15-041 : am. Table 322.31-1, Table 322.31-2, Table 322.31-4 Register December 2015 No. 720 , eff. 1-1-16.

Note

UA is equal to the product of the U-factor times the assembly area. Microsoft Windows NT 6.1.7601 Service Pack 1 REScheck is an acceptable software program for determining compliance with this section. Microsoft Windows NT 6.1.7601 Service Pack 1 The IECC 2009 version of REScheck meets the thermal envelope requirements of this code. Microsoft Windows NT 6.1.7601 Service Pack 1 TABLE 322.31-1 Microsoft Windows NT 6.1.7601 Service Pack 1 INSULATION AND FENESTRATION REQUIREMENTS BY COMPONENT a - See PDF for table Microsoft Windows NT 6.1.7601 Service Pack 1 TABLE 322.31-2 Microsoft Windows NT 6.1.7601 Service Pack 1 EQUIVALENT U-FACTORS - See PDF for table - See PDF for table Microsoft Windows NT 6.1.7601 Service Pack 1 TABLE 322.31-4 Microsoft Windows NT 6.1.7601 Service Pack 1 COMPONENT DWELLING THERMAL ENVELOPE REQUIREMENTS
FOR DWELLINGS USING LOWER EFFICIENCY APPLIANCES a - See PDF for table Microsoft Windows NT 6.1.7601 Service Pack 1