2020 MINNESOTA RESIDENTIAL CODE GUIDE

2020 MINNESOTA RESIDENTIAL CODE GUIDE

Chapter 1309 Changes and Minnesota Amendments to 2018 IRC

March 2020

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Table of Contents

Table of Contents

Overview ................................................................................................................................ 3 2018 IRC Adoption .................................................................................................................. 3 Effective Date ......................................................................................................................... 4 Note On Residential Energy Code............................................................................................ 4 Appendices ............................................................................................................................. 4 Appendix Q............................................................................................................................. 4 Transient Use (1309.0100 subp. 3) .......................................................................................... 5 Definition of "Approved" (1309.0202 subp. 2) ......................................................................... 6 Definition of "Transient" (1309.0202 subp. 2) ......................................................................... 6 Climate and Geographic Design Criteria (Table R301.2(1)) ...................................................... 6 Fire-Resistant Construction ..................................................................................................... 7 Fire-Resistant Construction Townhouses ................................................................................. 9 Fire-Resistant Construction Two-Family Dwellings .................................................................. 9 Fire-Resistant Construction ..................................................................................................... 9 Fire-Resistant Construction ? Table R302.6 ............................................................................. 9 Mechanical Ventilation......................................................................................................... 10 Emergency Escape and Rescue Openings .............................................................................. 10 Means of Egress ................................................................................................................... 12 Guards and Window Fall Protection...................................................................................... 12 Smoke Alarms....................................................................................................................... 12 Carbon Monoxide Alarms ..................................................................................................... 14 Accessibility .......................................................................................................................... 15 Elevators and Platform Lifts .................................................................................................. 16

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Storm Shelters ...................................................................................................................... 16 Solar Energy Systems ............................................................................................................ 16 Foundations.......................................................................................................................... 18 Exterior Decks....................................................................................................................... 22 Exterior Covering .................................................................................................................. 25 Attic Access .......................................................................................................................... 27 Weather Protection .............................................................................................................. 28 Amendments Carried Over.................................................................................................... 28 Appendix A ........................................................................................................................... 30 Prepared By Housing First Minnesota Nicholas Erickson Director f Research and Regulatory Affairs Source: Minnesota Department of Labor and Industry, Contractor U Presentation

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Overview

Effective March 31, 2020, the Minnesota Residential Building Code will be comprised of the 2018 International Residential Code (IRC) with Minnesota amendments

The work to update Minnesota's building codes began in 2017, with staff at the Minnesota Department of Labor and Industry (DLI) preforming a technical review of all 2015 and 2018 IRC changes. From January -March 2018, a thorough and public technical review was done by industry experts and representatives of interested parties. Called Technical Advisory Groups, these experts reviewed IRC changes and proposed Minnesota amendments. Following the completion of a technical review, DLI staff leading the specific TAGs presented reports and recommendations to the

After public comment on the TAG Reports, DLI rulemaking and technical staff began drafting proposed Minnesota Rule chapters (MN Rule) in accordance with the TAG recommendations.

In mid-2019, DLI issue the proposed building codes based on the 2018 TAG work. After a public comment period, the codes were sent off for final adoption with a March 31, 2020, effective date.

Housing First Minnesota Appointees

Housing First Minnesota would like to acknowledge the work of its TAG members:

Code Administration Mike Swanson Brandl Anderson

Residential Code Brent Nygaard

Lennar Minnesota

Structural TAG Mike Barden Pulte Homes

Energy Code Ross Anderson The Energy Network

Worldwide

This document is a summary of changes and is not to be substituted for the official Chapter 1309 and related codes referenced by Chapter 1309.

2018 IRC Adoption

MN Rule 1309.0010 outlined specific chapter adoption and administrative modifications. Unless noted, MN Rules 1309 adopts the 2018 IRC by reference. As with past code adoptions, specific IRC chapters that Minnesota has as separate codes in other MN Rule chapters were not adopted into Chapter 1309. This includes mechanical, plumbing and residential energy codes. Reference: 1309.0010.

Mandatory 2018 IRC chapters adopted include:

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? 2-10 ? Section P2904 of Chapter 29 (Residential Fire Sprinklers) ? 44 (Reference Standards) ? appendices K and Q

Reference: 1309.0010, subpart 2

Effective Date

The 2020 Minnesota Residential Code (Chapter 1309) goes into effect on March 31, 2020. This means any permit issued on or after March 31, 2020, the new version of Chapter 1309 will be required. Any project permitted on or before March 30, 2020, the existing Chapter 1309 will remain in effect. Reference: 1300.0030 subpart 2, C.

Note On Residential Energy Code

At the time this document was completed, DLI had not indicated that it was planning to adopt the 2018 International Energy Conservation Code (IECC) for residential construction. As of March 31, 2020, there will be no changes to MN Rule 1322 (Residential Energy Code).

Housing First Minnesota advocated against its adoption as the payback period met or exceeded the life of a mortgage and due to the fact that Minnesota already has the most costly energy code in the Midwest and has the greatest energy efficient in new residential construction of any mid- to high-production state in the nation.

Appendices

With the exception of Appendix K (Sound Transmission) and Appendix Q (Tiny Houses), all 2018 IRC appendices have been removed from adoption in Minnesota.

Appendix K on sound transmission is retained. Appendix Q, which covered tiny homes, is new. Appendix Q is applicable to any so-called tiny home used for a single-family dwelling. Reference: 1309.0010, subpart 1a

Appendix Q

A tiny home is defined as: A dwelling that is 400 square feet or less in floor area excluding lofts.

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Tiny houses shall comply with this code except as otherwise stated in appendix Q. According to DLI, appendix Q:

? States that tiny houses must comply with the code or utilize the prescriptive tiny house provisions in Appendix Q (ceiling heights, lofts, loft access, and emergency escape and rescue openings).

? Provides relaxed provisions as compared to those in the body of the code by providing allowances for compact dwelling designs.

Key Sections: 1309.0202 subp. 2 FLOOR AREA. The calculated square footage of the floor within the inside perimeter of the exterior walls of the building under consideration without deduction for hallways, stairways, closets, the thickness of interior walls, columns, or other features.

1309.0010, subpart 2 Allowances:

? ceiling heights, ? lofts, ? loft access, ? emergency escape & rescue openings, ? guards.

For further information, see the Department of Labor and Industry's Fact Sheet.

Transient Use (1309.0100 subp. 3)

New rule for clarification: 1309.0100 subp. 3 Transient use. Buildings constructed for transient use and required to be licensed by any Minnesota state agency shall be constructed in accordance with the requirements for Group R occupancies located in Minnesota Rules, chapter 1305.

Defining Factors: ? New one family, two family, and Townhouses ? Constructed for transient use and requiring Department of Health licensing ? Department of Health licensing requires State Fire Marshal inspection ? Ch. 1309 IRC 1, IRC 2, and IRC 3 occupancies not in the State Fire Code ? Comply with MR 1305, Group R occupancy requirements ? May require additional exits, fire sprinklers....

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Definition of "Approved" (1309.0202 subp. 2)

The definition of "approved" from Chapter 1300.0070, subp. 4a has been carried over to 1309.0202, subp. 2:

Approved. "Approved" means approval by the building official, pursuant to the Minnesota State Building Code, by reason of:

A. inspection, investigation, or testing; B. accepted principles; C. computer simulations; D. research reports; or E. testing performed by either a licensed engineer or by a locally or nationally recognized

testing laboratory.

Definition of "Transient" (1309.0202 subp. 2)

New amendment language for clarification in 1309.0202 subp. 2:

TRANSIENT. Occupancy of a dwelling unit or sleeping unit for not more than 30 days.

Climate and Geographic Design Criteria (Table R301.2(1))

Wind speed design has increased to 115 mph. Winter temperature design now references MN Rules 1322, not 1323, as 1323 is at present unchanged, and mean annual temp has gone from 41.16 degrees Fahrenheit to "footnote J":

j. The jurisdiction shall fill in this part of the table with the mean annual temperature from the National Climatic Data Center data table "Average Mean Temperature Index" at . Reference: 1309.0301 subp. 2

Note: The Minnesota-specific pages to this document are available in at the end of this document as Appendix A

1309.0301 subp. 2 IRC Table R301.2(1). Table R301.2(1) is amended to read as follows: f. The ground snow loads to be used in determining the design snow loads for buildings and other structures are given in Minnesota Rules, part 1303.1700 Ground Snow Load to verify by county. The roof snow load is a uniform load on the horizontal projection of the roof.

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Image Credit: DLI 1309.0301 subp. 2 IRC Table R301.2(1). (Current Footnote Retained)

Fire-Resistant Construction

Minnesota amended the 2018 IRC tables R302.1(1) and R302.1(2) and corresponding footnotes to retain the 2014 Minnesota Code: R302.1(1) c ? One-hour on the underside equates to 5/8-inch type X gypsum sheathing. Opening are not allowed. R302.1(2) d ? One-hour on the underside equates to one layer of 5/8-inch type X gypsum. Opening are not allowed. Table R302.1(1) is amended to read as follows:

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