subch. X of ch. SPS 321 Subchapter X — Construction in Floodplains
SPS 321.33 SPS 321.33Construction in floodplains.
SPS 321.33(1) (1)General. Where dwelling construction is allowed by local zoning ordinances to take place in floodfringe areas of floodplains, the dwelling shall meet the requirements of this subchapter.
SPS 321.33 Note Note: The department of natural resources (DNR) and the federal emergency management agency (FEMA) also have regulations that apply to construction in floodfringe areas.
SPS 321.33(2) (2)Elevation.
SPS 321.33(2)(a)(a) General. Except as provided in pars. (b) and (c), all dwellings constructed within a floodfringe area shall be elevated so the lowest floor and all basement floor surfaces are located at or above the base flood elevation.
SPS 321.33(2)(b) (b) Certified floodproof basements. Floodproof basements may have the top of the basement floor no more than 5 feet below the base flood elevation provided the basement is designed by a registered architect or engineer to be watertight and impermeable. No limitation is placed on the use or occupancy of a certified floodproof basement by the provisions of this subchapter.
SPS 321.33(2)(c) (c) Other enclosed spaces.
SPS 321.33(2)(c)1.1. Enclosed spaces not meeting the requirements of par. (b) are allowed at any depth below the base flood elevation provided the spaces are used only for one or more of the following purposes:
SPS 321.33(2)(c)1.a. a. Means of egress.
SPS 321.33(2)(c)1.b. b. Entrance foyers.
SPS 321.33(2)(c)1.c. c. Stairways.
SPS 321.33(2)(c)1.d. d. Incidental storage of portable or mobile items.
SPS 321.33(2)(c)2. 2. Fully enclosed spaces used only for those purposes listed in subd. 1. shall be designed to automatically equalize the hydrostatic pressure on exterior walls by allowing the entry and exit of floodwaters. Designs for meeting this requirement shall be certified by a registered architect or engineer or shall meet all of the following requirements:
SPS 321.33(2)(c)2.a. a. There shall be at least 2 pressure relieving openings and the openings shall have a total net area of not less than one square inch for every square foot of enclosed area subject to flooding.
SPS 321.33(2)(c)2.b. b. The bottom of all openings shall be no more than 12 inches above grade.
SPS 321.33(2)(c)2.c. c. Openings may not be equipped with screens, louvers, valves or other coverings or devices unless such devices permit the automatic entry and discharge of floodwaters.
SPS 321.33(3) (3)Certification of elevation. A registered land surveyor, architect or engineer shall certify the actual elevation in relation to mean sea level of the lowest structural member required to be elevated by the provisions of this subchapter.
SPS 321.33(4) (4)Anchorage. The structural systems of all dwellings shall be designed, connected and anchored to resist flotation, collapse or permanent lateral movement due to structural loads and stresses at the base flood elevation.
SPS 321.33(5) (5)Protection of electrical and mechanical systems. Electrical and mechanical equipment shall be placed above the base flood elevation or shall be designed to prevent water contact with the equipment in case of a flood up to the base flood elevation.
SPS 321.33(6) (6)Construction materials and methods. All dwellings constructed in floodplains shall be constructed using materials and methods designed to minimize flood and water damage.
SPS 321.33 History History: Emerg. cr. eff. 5-8-96; cr. Register, February, 1997, No. 494, eff. 3-1-97.
SPS 321.34 SPS 321.34Construction in coastal floodplains.
SPS 321.34(1)(1)General. All dwellings constructed in coastal floodplains shall be designed by a registered architect or engineer and shall meet the requirements of this section and s. SPS 321.33.
SPS 321.34(2) (2)Elevation. All dwellings constructed in a coastal floodplain shall be elevated so the lowest portion of all structural members supporting the lowest floor, with the exception of mat or raft foundations, pilings, piling caps, columns, grade beams and bracing, is located at or above the base flood elevation.
SPS 321.34(3) (3)Enclosures below base flood elevation. Enclosures below the base flood elevation in a coastal floodplain may not be used for human occupancy and shall be free of all obstructions, except for non-loadbearing walls and partitions. Non-loadbearing walls and partitions below base flood elevation shall be constructed to break away without causing any structural damage to the elevated portion of the dwelling or foundation system due to the effect of wind loads and water loads acting simultaneously.
SPS 321.34(4) (4)Foundations. All dwellings located in a coastal floodplain shall be supported and anchored on pilings or columns. The piling or column shall have adequate soil penetration to resist combined water and wind loads at the base flood elevation. Piling or column design shall consider the effect of scour of soil strata. Mat or raft foundations to support columns may not be used where soil under the mat or raft is subject to scour or other erosion from wave flow conditions.
SPS 321.34 History History: Emerg. cr. eff. 5-8-96; cr. Register, February, 1997, No. 494, eff. 3-1-97; correction in (1) made under s. 13.92 (4) (b) 7., Stats., Register December 2011 No. 672.
subch. XI of ch. SPS 321 Subchapter XI — Installation of Manufactured Homes
SPS 321.40 SPS 321.40Installation standards.
SPS 321.40(1) (1)Produced on or after April 1, 2007.
SPS 321.40(1)(a)(a) Adoption of standards. The federal Model Manufactured Home Installation Standards, 24 CFR part 3285, as in effect on December 1, 2014, is hereby incorporated by reference into this chapter.
SPS 321.40 Note Note: A copy of this edition of 24 CFR 3285 is on file in the offices of the Department and the Legislative Reference Bureau. Copies of 24 CFR 3285 are available at http://www.gpo.gov/fdsys/granule/CFR‐2013‐title24‐vol5/CFR‐2013‐title24‐vol5‐part3285.
SPS 321.40 Note Note: Section 24 CFR 3285.1(a)(1) reads as follows: “States that choose to operate an installation program for manufactured homes in lieu of the federal program must implement installation standards that provide protection to its residents that equals or exceeds the protection provided by these Model Installation Standards."
SPS 321.40(1)(b) (b) Compliance. A manufactured home produced on or after April 1, 2007, shall be installed in accordance with 24 CFR part 3285 except as otherwise provided by this subsection.
SPS 321.40 Note Note: As provided under 24 CFR 3285.1(a)(intro.), “The manufacturer's installation instructions, including specific methods for performing a specific operation or assembly, will be deemed to comply with these Model Installation Standards, provided they meet or exceed the minimum requirements of these Model Installation Standards and do not take the home out of compliance with the Manufactured Home Construction and Safety Standards (24 CFR part 3280)."
SPS 321.40(1)(c) (c) Additional definitions. These are department definitions in addition to the definitions in 24 CFR 3285.5:
SPS 321.40(1)(c)1. 1. “Department" means the department of safety and professional services.
SPS 321.40(1)(c)2. 2. “HUD" means the federal department of housing and urban development.
SPS 321.40(1)(c)3. 3. “Manufactured home section" means a portion of a manufactured home which when installed does not provide all the facilities for year–round residential occupancy.
SPS 321.40(1)(c)4. 4. “Manufactured home unit" means a complete manufactured home which when installed provides all the facilities for year–round residential occupancy.
SPS 321.40(1)(d) (d) Substituted definitions. Substitute the following definitions and informational note for the corresponding definitions in 24 CRF 3285.5:
SPS 321.40(1)(d)1. 1. “Approved" means acceptable to the department.
SPS 321.40(1)(d)2. 2. “Base flood elevation" means the elevation of the base flood, including wave height, relative to the datum specified on a county's flood hazard map.
SPS 321.40(1)(d)3. 3. “Flood hazard area" means the greater of either of the following:
SPS 321.40(1)(d)3.a. a. The special flood hazard area shown on the flood insurance rate map.
SPS 321.40(1)(d)3.b. b. The area subject to flooding during the design flood and shown on a county's flood hazard map, or otherwise legally designated.
SPS 321.40(1)(d)4. 4. “Flood hazard map" means a map delineating the flood hazard area and adopted by a county.
SPS 321.40(1)(d)5. 5. “Local authority having jurisdiction (LAHJ)" means the department; except where it is used in conjunction with “flood hazard map," in which case it means the county.
SPS 321.40(1)(d)6. 6. “Manufactured home" has the meaning given in s. 101.91 (2), Stats.
SPS 321.40 Note Note: Section 101.91 (2) of the Statutes is reprinted in a Note under s. SPS 320.07 (52m).
SPS 321.40(1)(e) (e) Fire separation. Substitute the following wording for the requirements in 24 CFR 3285.101: Fire separation distances shall be provided in accordance with the distances specified in s. SPS 326.12.
SPS 321.40(1)(f) (f) Flood hazard. Substitute the following wording and informational note for the requirements in 24 CFR 3285.102(c): Prior to the initial installation of a new manufactured home, the owner or permit applicant is responsible to determine whether the home site lies wholly or partly within a special flood hazard area as shown on the county's flood insurance rate map, flood boundary and floodway map, or flood hazard boundary map. If so located, the map and supporting studies adopted by the county may be used to determine the flood hazard zone and base flood elevation at the site.
SPS 321.40 Note Note: The department of natural resources and the federal emergency management agency may also have regulations that apply to construction in flood hazard areas.
SPS 321.40(1)(g) (g) Wind loads. This is a department informational note to be used under 24 CFR 3285.103(a):
SPS 321.40 Note Note: The HUD-required wind loads for Wisconsin, Zone 1, are not less than 15 psf horizontal and not less than 9 psf uplift.
SPS 321.40(1)(h) (h) Roof loads. This is a department informational note to be used under 24 CFR 3285.103(b):
SPS 321.40 Note Note: See ch. SPS 325 Appendix A for a reprint of HUD's roof-load zone map.
SPS 321.40(1)(i) (i) Thermal zone. This is a department informational note to be used under 24 CFR 3285.103(c):
SPS 321.40 Note Note: The HUD-required thermal zone for Wisconsin is Zone 3, for an overall maximum coefficient of heat transmission not to exceed 0.079 Btu/(hr.)(sq. ft.)(°F).
SPS 321.40(1)(j) (j) Soil test. This is a department requirement in addition to the requirements in 24 CFR 3285.202(a): Where a community-wide soil test does not exist and a soil test is required by this chapter, such as for a proposed frost-free-foundation design, the test shall be conducted to determine the soils in the entire community rather than at an individual site.
SPS 321.40(1)(k) (k) Footings and foundations. This is a department requirement in addition to the requirements in 24 CFR 3285.301: Footings and foundations may be designed in accordance with subchs. IV and V, which include a frost depth of at least 48 inches.
SPS 321.40(1)(L) (L) Caps. Substitute the following wording for the requirements in 24 CFR 3285.304(b)(2): A combination of up to two 4-inch-thick solid-concrete blocks and no more than one 2-inch-thick piece of hardwood lumber shall be permitted as cap material. Lumber used as cap and gap filler material may be of 2-inch nominal lumber at least equal to No. 2 spruce/pine/fir having a minimum fiber bending stress rating of 1200 psi. All lumber used as cap and gap filler shall be the same species of wood. Lumber used to fill a gap in the pier may only be placed at the top of the pier.
SPS 321.40(1)(m) (m) Gaps. This is a department informational note to be used under 24 CFR 3285.304(c)(1):
SPS 321.40 Note Note: See lumber specifications under par. (L).
SPS 321.40(1)(n) (n) Additional blocking. Substitute the following wording for the requirements in 24 CFR 3285.304(c)(3): If a pier is provided with a cap block of 4-inch concrete or 2-inch lumber, another 4-inch concrete block may be placed anywhere in the pier but may not be placed directly upon the footing.
SPS 321.40(1)(o) (o) Illustration. This is a department figure to be used under 24 CFR 3285.304:
SPS 321.40(1)(p) (p) Footings and foundations. This is a department requirement in addition to the requirements in 24 CFR 3285.312: Footings and foundations may be designed in accordance with any of the following:
SPS 321.40(1)(p)1. 1. Subchs. IV and V.
SPS 321.40(1)(p)2. 2. The department-approved slab design that is shown in the figure and limitations at the end of this paragraph.
SPS 321.40(1)(p)3. 3. Other proprietary designs approved by the department.
Limitations:
1. Minimum 3,000 psi concrete. [24 CFR 3285.312(a)(1)(ii)]
2. Rebar and mesh at least grade 40.
3. Soil bearing capacity at least 2,000 psf. [SPS 321.40 (2) (b) 2.]
4. Placed on undisturbed soil. May not be placed on unprepared fill material, organic soil, alluvial soil, mud, or frozen soil. [SPS 321.40 (2) (b) 1. and 24 CFR 3285.312(a)]
5. 8 to 10" of clean, graded sand, gravel, or crushed stone base in clay soils. [SPS 321.20 (2) with added thickness to resist frost.] Compaction of sand, etc., should be 95% of modified Proctor.
6. 6 mil vapor retarder overlapped 12 inches and sealed. [24 CFR 3285.204]
7. Maximum pier spacing of 7 feet with max. load per pier of 5,300 lbs. when placed on 6" thick slab. [SPS 321.40 (2) (b) 10. and 24 CFR 3285.310]
8. Maximum load per pier of 11,900 lbs. at mating line when centered on the 20" W. X 10" D. thickened slab, Section B-B, reinforced with 2 - #4 bars. Individual pier footings at mating line meeting sizing requirements in 24 CFR 3285 Table to 3285.312 may be used in lieu of continuous thickened slab. [24 CFR 3285.312(c)]
9. Site shall drain away from the home per SPS 321.12. Ensure drainage of sand fill zone so that any clay does not cause water to pool under the slab.
10. The water table may not be above the frost penetration depth, i.e. at least 4 feet below grade. [SPS 321.16 (1) (a)]
11. Saw cut joints in slab so that sections are approximately square. (Example: 16' by 76' slab = 4 segments.)
SPS 321.40(1)(q) (q) Anchors and tie-down straps. This is a department requirement in addition to the requirements in 24 CFR 3285.402(b)(1) and (2): Ground anchors and tie-down straps may be of painted steel to provide the weather-deterioration protection required by this section.
SPS 321.40(1)(r) (r) Severe climate. Substitute the following wording for the requirements in 24 CFR 3285.404: In frost-susceptible soil locations, ground-anchor augers shall be installed to the design depth of the anchor but not less than 30 inches, unless the foundation system is frost-protected to prevent the effects of frost heave, in accordance with acceptable engineering practice and ss. 24 CFR 3280.306 and 3285.312.
SPS 321.40(1)(s) (s) Ventilation openings. Substitute the following wording for the requirements in 24 CFR 3285.505(d): Ventilation openings shall be covered for their full height and width with a perforated corrosion- and weather-resistant covering that is designed to prevent entry of rodents.
SPS 321.40(1)(t) (t) Plumbing. This is a department informational note to be used under 24 CFR 3285.601:
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Published under s. 35.93, Stats. Updated on the first day of each month. Entire code is always current. The Register date on each page is the date the chapter was last published.