Wisconsin Administrative Code › Department of Safety and Professional Services › SPS 301-399 - Safety, Buildings, and Environment › SPS 320-325 - Uniform Dwelling Code › Chapter SPS 321 - Construction Standards › Subchapter VII - Walls › Section SPS 321.24 - Exterior covering

Current through June 24, 2024
(1) GENERAL. The exterior walls shall be
					 covered with a permanent weather resistant finish.
(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.
Note:
An example of acceptable
						water-resistant covering for a wall is foam sheathing with permanently taped
						joints.
(3) FLASHING.
(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.
(b) The flashing shall extend to the surface
					 of the exterior wall finish and prevent water from reentering the exterior
					 wall.
(c)
1. Any joints between 2 pieces of flashing
					 that form a vertical joint shall be lapped a minimum of 6 inches and
					 sealed.
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.
3. Sealants used for
					 flashing shall be exterior grade and shall be compatible with the materials
					 being sealed.
(d)
					 Flashing shall be provided at all of the following locations:
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.
2. At the intersection of chimneys or other
					 masonry construction with frame walls.
3. Under and at the ends of masonry, wood or
					 metal copings and sills.
4.
					 Continuously above all projecting wood trim.
5. Where porches, decks or stairs attach to a
					 wall or floor assembly of wood frame construction.
6. At wall and roof intersections.
7. At built-in gutters.
8. Along the bottom of door openings that are
					 elevated above-grade.
Note:
Flashing placed along the bottom of a
						door opening that is elevated above-grade can subsequently accommodate adding a
						deck outside the door.
(e) For a roof that intersects with an
					 upper-lying head wall and rake wall, such as where a dormer is provided, the
					 vertical metal flashing along the rake wall shall extend down the roof at least
					 one-half inch past the vertical flashing on the head wall.
Note:
A head wall as addressed in this
						paragraph intersects a sloping roof at a horizontal line along the top of a
						roof segment. A rake wall intersects a sloping roof along the side of a roof
						segment.
(f) For a roof
					 eave that intersects with a sidewall, the end of the roof flashing shall be
					 installed so that it diverts water away from the sidewall and onto the roof or
					 into the gutter.
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.
Note:
See s.
						SPS
						321.26(8) for further requirements
						relating to flashing for masonry.