International Building Code 2012 (IBC 2012)

Heads up: There are no amended sections in this chapter.


This chapter shall be known as "Minnesota provisions."


This chapter contains requirements of the code that are mandated by Minnesota Statutes, are needed to address Minnesota's climatic conditions, or are otherwise determined necessary to provide a safe minimum level of construction in an area not appropriately regulated in the International Building Code or International Residential Code.


Subpart 1. Ratio.
In a place of public accommodation subject to this part, the ratio of water closets for women to the total of water closets and urinals provided for men must be at least three to two, unless there are two or fewer fixtures for men.
Subp. 2. Application.
This part applies only to the construction of buildings or structures of public accommodation or where the cost of alterations to an existing place of public accommodation exceeds 50 percent of the estimated replacement value of the existing facility.
Subp. 3. Definition.
For purposes of this part, "place of public accommodation" means a publicly or privately owned sports or entertainment arena, stadium, theater, community or convention hall, special event center, amusement facility, or special event center in a public park, that is designed for occupancy by 200 or more people.


Every parking ramp or other parking facility must include spaces for the parking of motor vehicles having a capacity of seven to 16 persons. The number of required spaces must be determined by two percent of the gross designed parking area with a minimum of two spaces. The minimum vertical clearance to and within required spaces is 98 inches (2489 mm).


All automatic garage door opening systems that are installed, serviced, or repaired for garages serving residential buildings, must comply with the provisions of Minnesota Statutes, Sections 325F.82 and 325F.83.


Subpart 1. Requirement.
Space must be provided for the collection, separation, and temporary storage of recyclable materials within or adjacent to all new or significantly remodeled buildings or structures that contain 1,000 square feet (92.9 m2) or more.
Exception: Residential structures with fewer than four dwelling units.
Subp. 2. Location.
Space designated for recycling shall be located so it is at least as convenient as the location where other solid waste is collected. If feasible, recycling space should be adjacent to other solid waste collection space. Recycling space must be located and designed in accordance with the provisions of this code and ordinances of the jurisdiction.
Subp. 3. Identification on plans.
Space designated for recycling must be identified on plans submitted for a building permit.
Subp. 4. Minimum space.
Space designated for recycling must be sufficient to contain all the recyclable materials generated from the building. The minimum amount of recycling space required must be the number of square feet determined by multiplying the gross square feet of floor areas assigned to each use within a building as set forth in subpart 5, Table 1-A, times the corresponding factor.
Subp. 5.

If the provisions of Table 1-A are excessive due to a specific use, space for recycling may be considered individually by the administrative authority.

1. Aircraft hangers (no repair) .001
2. Auction rooms .0025
32. Auditoriums, reviewing stands, stadiums, gymnasiums,
public swimming pools, skating rinks
4. Lodge rooms, conference rooms, lounges, stages,
exhibit rooms
5. Dance floors, churches3 and chapels, lobby .001
6. Dining rooms .003
73. Drinking establishments .004
83. Bowling alleys (excluding lanes) .0025
93. Children's homes and homes for the aged .0025
10. Classrooms .002
11. Courtrooms .001
12. Dormitories .0025
13. Exercise rooms .001
14. Garages, parking .001
153. Hospitals and sanitariums, nursing homes .0025
163. Hotels .002
17. Apartments .0025
18. Kitchens — commercial .003
193. Libraries .002
20. Locker rooms .001
21. Malls .0025
22. Manufacturing areas .0025
23. Mechanical equipment rooms .001
243. Nurseries for children (day care) .002
25. Offices .0025
26. School shops and vocational rooms .0025
27. Storage and stock rooms .0025
28. Warehouses .001
29. All others .0025
  1. The area of a use must include all areas serving or accessory to a use (corridors, accessory use areas, etc.).
  2. Exclude playing areas, courts, fields, and like areas.
  3. The factors for these uses are intended to include all incidental uses typical of these types of facilities.


Subpart 1. Minimum footing depth.
In the absence of a determination by an engineer competent in soil mechanics, the minimum allowable footing depth in feet due to freezing is five feet (1524 mm) in Zone I and 31/2 feet (1067 mm) in Zone II.

Zone I includes the counties of: Aitkin, Becker, Beltrami, Carlton, Cass, Clay, Clearwater, Cook, Crow Wing, Douglas, Grant, Hubbard, Itasca, Kanabec, Kittson, Koochiching, Lake, Lake of the Woods, Mahnomen, Marshall, Mille Lacs, Morrison, Norman, Otter Tail, Pennington, Pine, Polk, Red Lake, Roseau, St. Louis, Todd, Traverse, Wadena, and Wilkin.

Zone II shall include the counties of: Anoka, Benton, Big Stone, Blue Earth, Brown, Carver, Chippewa, Chisago, Cottonwood, Dakota, Dodge, Faribault, Fillmore, Freeborn, Goodhue, Hennepin, Houston, Isanti, Jackson, Kandiyohi, Lac qui Parle, Le Sueur, Lincoln, Lyon, McLeod, Martin, Meeker, Mower, Murray, Nicollet, Nobles, Olmsted, Pipestone, Pope, Ramsey, Redwood, Renville, Rice, Rock, Scott, Sibley, Sherburne, Stearns, Steele, Stevens, Swift, Wabasha, Waseca, Washington, Watonwan, Winona, Wright, and Yellow Medicine.

Less depths may be permitted when supporting evidence is presented by an engineer competent in soil mechanics.

Subp. 2. Soil under slab on grade construction for buildings.
When soil, natural or fill, is sand or pit run sand and gravel, and of depth in accordance with minimum footing depth requirements for each zone, slab on grade construction which is structurally designed to support all applied loads is permitted. Sand must contain less than 70 percent material that will pass through a U.S. Standard No. 40 sieve and less than five percent material that will pass through a No. 200 sieve (five percent fines), or be approved by an engineer competent in soil mechanics.
Exception: Slab on grade construction may be placed on any soil except peat or muck for detached one-story private garage, carport, and shed buildings not larger than 1,000 square feet (92.9 m2).

Footings for interior bearing walls or columns may be constructed to be integral with the slab on grade for any height building. Footings for exterior bearing walls or columns may be similarly constructed for any height building when supporting soil is as described in this subpart. Footing design must reflect eccentric loading conditions at slab edges, soil bearing capacity, and the requirements of International Building Code, Chapter 19.


The ground snow load, Pg, to be used in determining the design snow loads for buildings and other structures shall be 60 pounds (27 kg) per square foot in the following counties: Aitkin, Becker, Beltrami, Carlton, Cass, Clearwater, Cook, Crow Wing, Hubbard, Itasca, Kanabec, Kittson, Koochiching, Lake, Lake of the Woods, Mahnomen, Marshall, Mille Lacs, Morrison, Norman, Otter Tail, Pennington, Pine, Polk, Red Lake, Roseau, St. Louis, Todd, and Wadena. The ground snow load, Pg, to be used in determining the design snow loads for buildings and other structures shall be 50 pounds (22 kg) per square foot in all other counties.




The decking surface and upper portions of exterior wood decks, patios, and balconies may be constructed of any of the following materials:

  1. the heartwood from species of wood having natural resistance to decay or termites, including redwood and cedars;
  2. grades of lumber which contain sapwood from species of wood having natural resistance to decay or termites, including redwood and cedars; or
  3. treated wood.

The species and grades of wood products used to construct the decking surface and upper portions of exterior decks, patios, and balconies must be made available to the building official on request before final construction approval.


All new bleachers, manufactured, installed, sold, or distributed where the bleachers or bleacher open spaces will be over 55 inches (1397 mm) above grade or the floor below, and all bleacher guardrails if any part of the guardrail will be over 30 inches (762 mm) above grade or the floor below must comply with the State Building Code in effect and the provisions of Minnesota Statutes, Section 326B.112.


Subpart 1. Section 2200.
  1. This section applies to the wind loads for the main wind force-resisting systems only.
  2. In order to utilize wind loads from this part, the building shall meet the following requirements:
    1. 60 feet (18.3 m) or less in height;
    2. height not to exceed least horizontal dimension;
    3. enclosed building;
    4. roof shape — flat, gabled, or hip;
    5. roof slope of 45 degrees maximum;
    6. simple diaphragm building;
    7. not a flexible building;
    8. regular shape and approximately symmetrical;
    9. no expansion joints or separations; and
    10. no unusual response characteristics (for example: vortex shedding, galloping, or buffeting).
Subp. 2. Simplified design wind pressures.
Ps represents the net pressures (sum of internal and external) to be applied to the horizontal and vertical projections of building surfaces. For the horizontal pressures, Ps is the combination of the windward and leeward net pressures. Ps may be determined from Equation Palt.
Ps = Kzt (V2 ult × V2ult /115 × 115)Palt(Equation Palt)


Kzt = Topographic factor as defined in Chapter 26 of ASCE 7.
Palt = Alternative simplified design wind pressure from Table Palt.
Horizontal and Vertical Pressure*
Exp B 25 psf
Exp C 30 psf
Exp D 35 psf
*For vertical pressure, the above values are negative (upward).

Overhang Vertical Pressure*
Exp B -40 psf
Exp C -48 psf
Exp D -56 psf
*Negative values are upward.







Subpart 1. Applicability; residential structures.
The purpose of parts to establish minimum requirements for passive radon control systems that apply to all new residential structures listed in items A to H:
  1. One-family dwellings;
  2. Two-family dwellings;
  3. Townhouses;
  4. Apartment buildings;
  5. Condominiums;
  6. Multistory buildings that include any residential occupancy;
  7. Mixed-occupancy buildings that include any residential occupancy; and
  8. Any addition to an existing dwelling that currently has a radon control system incorporated into the existing building.

If a fan is installed in a passive radon control system, this creates an active radon control system that must comply with the requirements of parts 1303.2403.

Subp. 2. Applicability; design features.
The requirements in parts 1303.2402.shall apply to any structure identified in subpart 1, items A to H, if the structure is designed with any of the features identified in items A to F:
  1. A basement concrete slab in contact with the earth;
  2. A crawl space within the building's conditioned space that has a concrete or earth floor;
  3. A wood foundation floor constructed on or directly above the earth;
  4. Slab on grade construction designs;
  5. Attached or tuck-under garages, unless the floor, wall, and ceiling assemblies separating the garage from the dwellings are sealed; and
  6. Any building configuration that allows radon gas to enter the residential dwelling.
  1. Crawl spaces outside the conditioned space of the residential dwelling, when the crawl space is ventilated directly to the outside atmosphere according to IRC Sections R408.l and R408.2; IBC Sections 1203.3 and 1203.3.1; Code of Federal Regulations, Section 3285.505; and Minnesota Rules, Chapter 1350.
  2. Hotels and motels.
  3. Additions to existing dwellings that do not currently have a radon control system incorporated into the existing dwelling.


Subpart 1. Terms not defined.
For purposes of parts 1303.2403, where terms are not defined in parts 1303.2403, Merriam-Webster's Collegiate Dictionary, available at, shall be considered as providing ordinarily accepted meanings. The dictionary is incorporated by reference, is subject to frequent change, and is available through the Minitex interlibrary loan system.
Subp. 2. Definitions.
For the purposes of parts 1303.2403, the terms defined in this part have the meanings given them.
ACTIVE RADON CONTROL SYSTEM. "Active radon control system" means a system designed to achieve lower air pressure below the soil-gas membrane relative to the indoor air pressure by use of a fan that has been added to the passive radon control system.
APPROVED. "Approved" means approval by the building official, pursuant to the Minnesota State Building Code, by reason of inspection, investigation, or testing; accepted principles; computer simulations; research reports; or testing performed by either a licensed engineer or by a locally or nationally recognized testing laboratory.
CFR. "CFR" means Code of Federal Regulations, title 24, Chapter 3285.
GAS PERMEABLE MATERIAL. A "gas permeable material" means any of the following:
  1. A uniform layer of clean aggregate, a minimum of 4 inches (102 mm) thick. The aggregate shall consist of material that will pass through a 2-inch (51 mm) sieve and be retained by a 1/4 inch (6.4 mm) sieve.
  2. A uniform layer of sand, native or fill, a minimum of 4 inches (102 mm) thick, overlain by a layer or strips of geotextile drainage matting designed to allow the lateral flow of soil gases.
  3. Other materials, systems, or floor designs if the material, system, or floor design is professionally engineered to provide depressurization under the entire soil-gas membrane.
IBC. "IBC" means the International Building Code incorporated by reference except as qualified and amended in Minnesota Rules, Chapter 1305.
IRC. "IRC" means the International Residential Code incorporated by reference except as qualified and amended in Minnesota Rules, Chapter 1309.
PASSIVE RADON CONTROL SYSTEM. "Passive radon control system" means a system designed to achieve lower air pressure below the soil-gas membrane relative to the indoor air pressure by use of a vent pipe that relies on stack effect to provide an upward flow of air from beneath the soil-gas membrane.
RADON GAS. "Radon gas" means a naturally occurring, chemically inert, radioactive gas.
SEALED. "Sealed" means to prevent the movement of air or airborne gases through a floor, wall, or ceiling assembly.
SOIL-GAS MEMBRANE. "Soil-gas membrane" means a continuous membrane of 6-mil (0.15 mm) polyethylene, or 3-mil (0.075 mm) cross-laminated polyethylene.
VENT PIPE. "Vent pipe" means a 3-inch (76 mm) or 4-inch (102 mm) diameter ABS or PVC pipe used to vent subsoil gases that have collected under the soil-gas membrane to the exterior of the dwelling.


Subpart 1. Gas permeable material preparation.
A gas-permeable material shall be placed on the prepared subgrade under all floor systems.
Subp. 2. Soil-gas membrane installation.
A soil-gas membrane shall be placed on top of the gas-permeable material prior to placing a floor on top of or above the soil. The soil-gas membrane shall cover the entire floor area. Separate sections of membrane must be lapped at least 12 inches (305 mm). The membrane shall fit closely around any penetration of the membrane to reduce the leakage of soil gases. All punctures or tears in the soil-gas membrane shall be repaired by sealing and patching the soil-gas membrane with the same kind of material, maintaining a minimum 12-inch (305 mm) lap.
Subp. 3. "T" fitting.
A "T" fitting shall be installed beneath the soil-gas membrane with a minimum of 10 feet of perforated pipe connected to any two openings of the "T" fitting, or by connecting the two openings to the interior drain tile system. The third opening of the "T" fitting shall be connected to the vent pipe. The perforated pipe or drain tile and the "T" fitting shall be the same size as the vent pipe. All connections to the "T" fitting shall be tight fitting.
Subp. 4. Potential entry routes.
Potential entry routes for radon gas shall be sealed according to this subpart, as applicable.
  1. Floor openings. Floor openings around bathtubs, showers, water closets, pipes, wires, or other objects that penetrate the soil-gas membrane and the concrete slab or other floor systems, shall be sealed.
  2. Concrete joints. All control joints, isolation joints, construction joints, or any other joints in the concrete slab, or the joint between the concrete slab and a foundation wall, shall be sealed. All gaps and joints shall be cleared of all loose material prior to sealing.
  3. Foundation walls. Penetrations of all foundation wall types shall be sealed. Joints, cracks, or other openings around all penetrations of both exterior and interior surfaces of foundation walls shall be sealed.
    1. Hollow block masonry foundation walls shall be constructed with either:
      1. continuous course of solid masonry at or above the exterior ground surface;
      2. one course of masonry grouted solid at or above the exterior ground surface; or
      3. a solid concrete beam at or above the finished exterior ground surface.
    2. When a brick veneer or other masonry ledge is installed, the masonry course immediately below the veneer or ledge shall be solid or filled.
  4. Unconditioned crawl spaces. All penetrations through floors or walls into unconditioned crawl spaces shall be sealed. Access doors into unconditioned crawl spaces shall be gasketed. Crawl space ventilation shall be provided according to part 1303.2400.
  5. Sumps. A sump connected to interior drain tile may serve as the termination point for the vent pipe, if the sump cover is sealed or gasketed and designed to accommodate the vent pipe. The sump pump water discharge pipe shall have a backflow preventer installed.
Subp. 5. Vent pipes.
  1. Single vent pipe. The vent pipe shall be primed and glued at all fittings and shall extend up from the radon control system's collection point to a point terminating a minimum of 12 inches (305 mm) above the roof. The vent pipe shall be located at least 10 feet (3048 mm) away from any window or other opening into the conditioned spaces of the building. Vent pipes routed through unconditioned spaces shall be insulated with a minimum of R-4 insulation. Vent pipes within the conditioned envelope of the building shall not be insulated.
  2. Multiple vent pipes. In buildings where interior footings or other barriers separate the gas-permeable material into two or more areas, each area shall be fitted with an individual radon control system in accordance with item A, or connected to a single radon gas vent pipe terminating above the roof in accordance with item A.
  3. Vent pipe drainage. All components of the radon gas vent pipe system shall be installed to provide drainage to the ground beneath the soil-gas membrane.
  4. Vent pipe accessibility. Radon gas vent pipes shall be provided with space around the vent pipe for future installation of a fan. The space required for the future fan installation shall be a minimum of 24 inches (610 mm) in diameter, centered on the axis of the vent pipe, and shall extend a minimum distance of 3 vertical feet (914 mm).
    Exception: Accessibility to the radon gas vent pipe is not required if the future fan installation is above the roof system and there is an approved rooftop electrical supply provided.
  5. Vent pipe identification. All radon gas vent pipes shall be identified with at least 1 label on each story and in attics and crawl spaces. The label shall read: "Radon Gas Vent System."
  6. Combination foundations. Combination basement/crawl space or slab-on grade/crawl space foundations shall have separate radon gas vent pipes installed in each type of foundation area. Each radon gas vent pipe shall terminate above the roof or shall be connected to a single vent pipe that terminates above the roof.
Subp. 6. Power source.
A power source consisting of an electrical circuit terminating in an approved electrical box shall be installed during construction in the anticipated location of the vent pipe fan to allow for the future installation of a fan into a passive radon control system to make the system an active radon control system. The power source shall not be installed in any conditioned space, basement, or crawl space.


When an active radon control system is installed, all the requirements for the passive radon control system in parts 1303.2402.shall be met. In addition, an active radon control system shall incorporate items A to C in this part.

  1. Radon gas vent pipe fan. A radon gas vent pipe fan manufactured for radon control systems and rated for continuous operation that provides a minimum measurement of 50 cubic feet (1.4158 m3) per minute at 1/2-inch (12.7 mm) water column shall be installed in the vertical vent pipe. The fan shall be attached to a radon gas vent pipe that connects the air below the soil-gas membrane with outdoor air and relies on the fan to provide upward air flow in the vent pipe. The radon gas vent pipe fan shall be installed outdoors, in attics, or in garages. The radon gas vent pipe fan shall not be installed in conditioned spaces of a building, basement, or crawl space. The radon gas vent pipe fan shall not be located where it positively pressurizes any portion of the vent pipe that is located inside conditioned space.
  2. System monitoring device. An audible alarm, a manometer, or other similar device shall be installed to indicate when the fan is not operating.
  3. Luminaire and receptacle outlet. A switch-controlled luminaire and the receptacle outlet near the fan shall be installed according to the Minnesota Electrical Code. The requirements of the International Mechanical Code, Section 306, do not apply.
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