SPS 321.225 History
History: Cr.
Register, March, 1992, No. 435, eff. 4-1-92; correction in (1) to (6) made under s.
13.92 (4) (b) 7., Stats.,
Register December 2011 No. 672.
SPS 321.23(1)(1)
Live and dead loads. All walls shall support all superimposed vertical dead loads and live loads from floors and roofs.
SPS 321.23(2)
(2) Horizontal wind load. Walls shall be designed to withstand a horizontal wind pressure of at least 20 pounds per square foot applied to the vertical projection of that portion of the dwelling above grade. No wind load reduction shall be permitted for the shielding effect of other buildings.
SPS 321.23 History
History: Cr.
Register, November, 1979, No. 287, eff. 6-1-80.
SPS 321.24(1)(1)
General. The exterior walls shall be covered with a permanent weather resistant finish.
SPS 321.24(2)
(2) During construction. During construction, wall cavity insulation may not be installed until a water-resistant covering is in place over the wall cavity and windows, doors and a roof with at least underlayment are installed.
SPS 321.24 Note
Note: An example of acceptable water-resistant covering for a wall is foam sheathing with permanently taped joints.
SPS 321.24(3)(a)(a) Corrosion-resistant flashing shall be installed in the exterior wall to prevent water from entering the wall cavity or coming in contact with the structural framing components.
SPS 321.24(3)(b)
(b) The flashing shall extend to the surface of the exterior wall finish and prevent water from reentering the exterior wall.
SPS 321.24(3)(c)1.1. Any joints between 2 pieces of flashing that form a vertical joint shall be lapped a minimum of 6 inches and sealed.
SPS 321.24(3)(c)2.
2. Any joints between 2 pieces of flashing that form a horizontal joint shall be lapped a minimum of 2 inches and sealed unless otherwise specified by the flashing manufacturer.
SPS 321.24(3)(c)3.
3. Sealants used for flashing shall be exterior grade and shall be compatible with the materials being sealed.
SPS 321.24(3)(d)
(d) Flashing shall be provided at all of the following locations:
SPS 321.24(3)(d)1.
1. At the top of all exterior door and window openings, unless using self-flashing windows that provide at least one inch of flashing around the opening, including the corners.
SPS 321.24(3)(d)2.
2. At the intersection of chimneys or other masonry construction with frame walls.
SPS 321.24(3)(d)5.
5. Where porches, decks or stairs attach to a wall or floor assembly of wood frame construction.
SPS 321.24 Note
Note: See s.
SPS 321.26 (5) for additional flashing requirements with masonry cavity walls and s.
SPS 321.28 (7) for additional flashing requirements with roofing.
SPS 321.24(4)(a)1.1. Exterior walls of wood or metal frame construction shall be provided with a water-resistive barrier from the highest point to the bottom of the permanent weather-resistant covering.
SPS 321.24 Note
Note: Acceptable water-resistive barrier materials include polymeric-based house wraps and spray-applied water-resistive barriers installed per the manufacturer's instructions, #15 or greater asphalt-saturated felts that comply with ASTM D 226 for type I felt and extruded foam sheathing with permanently taped joints. Duct tape or similar will not result in a permanently taped joint.
SPS 321.24(4)(a)2.
2. Structural products with an integral water-resistive barrier may be approved by the department as a complete assembly.
SPS 321.24(4)(b)
(b)
Material compatibility. The water-resistive barrier material shall be compatible with the other materials in the wall with which it will come into contact.
SPS 321.24 Note
Note: Spray-applied water-resistive barriers may not be compatible with foam plastic insulation.
SPS 321.24(4)(c)1.1. Polymer-based house wraps shall meet all of the following requirements:
SPS 321.24(4)(c)1.a.
a. A water vapor permeability rating of 5 perms or higher when tested in accordance with ASTM E96.
SPS 321.24(4)(c)1.b.
b. An acceptable water-resistance rating determined in accordance with ASTM D779, AATCC 127 or CCMC 07102.
SPS 321.24 Note
Note: Asphalt-saturated felt or "tar paper" is not a polymeric-based house wrap.
SPS 321.24 Note
Note: For more information on the water-resistance tests and their results, see the International Code Council Evaluation Services Acceptance Criteria AC 38.
SPS 321.24(4)(c)2.
2. Spray-applied water-resistive barriers shall be approved under the International Code Council Evaluation Services.
SPS 321.24 Note
Note: For approval criteria, see ICC-ES acceptance criteria AC 212 or successor document.
SPS 321.24(4)(d)1.1. Horizontal seams in sheet or strip material shall be overlapped such that the upper layer extends over the lower layer at least 2 inches.
SPS 321.24(4)(d)2.
2. Vertical seams in sheet or strip materials shall be overlapped at least 6 inches.
SPS 321.24(4)(e)1.1. Penetrations caused by fasteners of the water-resistive barrier or the weather-resistant exterior covering do not require sealing.
SPS 321.24(4)(e)2.
2. Penetrations of 5 square inches or less with an annular space of no more than ½ inch shall be sealed with caulk or similar material.
SPS 321.24(4)(e)3.
3. Penetrations of greater than 5 square inches shall be flashed in accordance with
sub. (3).
SPS 321.24 History
History: Cr.
Register, November, 1979, No. 287, eff. 6-1-80; r. and recr.
Register, March, 2001, No. 543, eff. 4-1-01;
CR 02-077: cr. (3)
Register May 2003 No. 569, eff. 8-1-03;
CR 08-043: am. (2), renum. (3) (c) to be (3) (d), cr. (3) (c) and (4)
Register March 2009 No. 639, eff. 4-1-09.
SPS 321.25
SPS 321.25
Wood frame walls. Unless designed through structural analysis, wood frame walls shall comply with the following requirements.
SPS 321.25(1)
(1) Stud configuration. Wood studs shall comply with the size and spacing requirements indicated in Table 321.25-A. Studs in the exterior walls shall be placed with the wide faces perpendicular to the plane of the wall.
SPS 321.25 Note
Note: See Appendix for acceptable nailing schedule.
SPS 321.25 Note
Note: See s.
SPS 321.10 for requirements on treating wood for decay and termite resistance.
SPS 321.25(2)(a)(a) General. Except as allowed under
subd. 3., top plates shall be provided and configured as follows:
SPS 321.25(2)(a)2.
2. End joints in double top plates shall be offset at least 2 stud spaces.
SPS 321.25(2)(a)3.
3. Double top plates shall be overlapped at the corners and at intersections of partitions.
SPS 321.25(2)(a)4.
4. The plate immediately above the stud may have a joint only when directly over the stud.
SPS 321.25(2)(b)1.1. When piping or ductwork is placed in an exterior wall or an interior load-bearing wall, such that at least half of the top plate is removed, the plate shall be reinforced with a steel angle at least 2 inches by 2 inches by 20 gauge thick.
SPS 321.25 Note
Note: 20 gauge is approximately 0.036 inch.
SPS 321.25(2)(b)2.
2. The steel angle shall span the gap and extend at least to the midpoint of the adjacent stud spaces.
SPS 321.25(2)(c)1.1. A single top plate may be used in place of a double top plate provided a rafter is located directly over the studs and the plate is securely tied at the end joints, corners and intersecting walls. Joints may occur in single top plates only when directly over a stud.
SPS 321.25(2)(c)2.
2. A continuous header, consisting of two 2-inch members set on edge, may be used in lieu of a double plate if tied to the adjacent wall.
SPS 321.25(3)
(3) Wall openings. Where doors or windows occur, headers shall be used to carry the load across the opening.
SPS 321.25(3)(a)
(a) Header size. The size of headers shall be determined in accordance with the spans and loading conditions listed in Tables 321.25-B, 321.25-C and 321.25-D. Headers for longer spans shall be designed by an engineering method under
s. SPS 321.02.
SPS 321.25(3)(b)
(b) Header support. Headers in bearing walls shall be supported in accordance with
subd. 1. or
2. or
3.
SPS 321.25(3)(b)1.
1. Headers 3 feet or less in length shall be directly supported on each end by either:
SPS 321.25(3)(b)2.
2. Headers greater than 3 feet but less than or equal to 6 feet in length shall be directly supported on each end by the single common stud and a shoulder stud.
SPS 321.25(3)(b)3.
3. Headers greater than 6 feet in length shall be directly supported on each end by the single common stud and 2 shoulder studs.
SPS 321.25(4)
(4) Notching. Notching and boring of columns or posts is prohibited unless designed through structural analysis. Studs shall not be cut or bored more than 1/3 the depth of the stud, unless the stud is reinforced.
SPS 321.25(5)
(5) Partitions. Load-bearing partitions shall be placed over beams, girders, or other load-bearing partitions. Load-bearing partitions running at right angles to the joists shall not be offset from the main girder or walls more than the depth of the joist unless the joists are designed to carry the load.
SPS 321.25(6)(a)2.
2. Posts and columns shall bear directly over the middle 1/
3 of a footing.
SPS 321.25(6)(a)3.
3. Posts and columns shall be restrained at the top and bottom to resist displacement.
SPS 321.25(6)(a)4.
4. All columns shall be positively attached to the beams they support using clips, straps or saddles.
SPS 321.25(6)(a)5.
5. Posts and columns that use a height adjustment mechanism shall have the mechanism imbedded in concrete or permanently disabled after installation.
SPS 321.25(6)(b)
(b) Bearing surface. Posts and columns shall have a steel bearing plate affixed to one or both ends to distribute any applied loads and to prevent fiber crushing of any structural member being supported.
