Section SPS 362.1405 - Exterior walls(1m) Substitute the following wording for the requirements, but not the exceptions, in IBC section 1405.3.1: Class I and II vapor retarders. Class I or II vapor retarders shall be provided on the interior side of frame walls and ceiling assemblies.(2m) This is a department exception in addition to the exceptions in IBC section 1405.3.1: Where other approved means to avoid condensation in unventilated framed wall, floor, roof and ceiling cavities, and box sills are provided.(3m) This is a department rule in addition to the requirements in IBC section 1405.14.1: Polystyrene sheathing may be utilized as the required backing material for vinyl siding provided all of the following characteristics and conditions are met: (a) The sheathing is extruded, rigid and cellular.(b) The sheathing is type IV, as specified in ASTM C578.(c) The sheathing has a thickness of at least one inch.(d) The sheathing is installed with an on-center stud spacing of 16 inches or less.(e) The mean roof height of the building is 40 feet or less.(f) The building wall has a wind exposure category of B or C, as established in IBC section 1609.4; and the building is not sited on the upper half of an isolated hill or escarpment meeting conditions 1, 2, and 3 in IBC section 1609.1.1.1.Wis. Admin. Code Department of Safety and Professional Services § SPS 362.1405
CR 04-016: cr. Register December 2004 No. 588, eff. 1-1-05; CR 06-120: am. (2) (c) 3. Register February 2008 No. 626, eff. 3-1-08; CR 10-103: r. and recr. Register August 2011 No. 668, eff. 9-1-11.Amended by, CR 16-094: renum (1) and (2) to (2m) and (3m) and am., cr. (1m), Register April 2018 No. 748, eff. 5/1/2018