# Minn. R. 1309.0302: SECTION R302, FIRE-RESISTANT CONSTRUCTION > Minnesota · Regulations · In force URL: https://www.frixlaw.com/law-library/statutes/STATE_MN_ADR_1309_0302 ## Section - **Citation:** Minn. R. 1309.0302 - **Heading:** SECTION R302, FIRE-RESISTANT CONSTRUCTION - **Jurisdiction:** Minnesota - **Kind:** Regulations - **Status:** In force - **Text as of:** August 14, 2026 - **Source:** Compiled text - **Location:** Minnesota Administrative Rules / DEPARTMENT OF LABOR AND INDUSTRY / Chapter 1309 / Part 1309.0302 ## Text Subpart 1. IRC Tables R302.1(1) and R302.1(2). Table R302.1(1) and Table R302.1(2) are amended to read as follows: TABLE R302.1(1) EXTERIOR WALLS EXTERIOR WALL ELEMENT MINIMUM FIRE-RESISTANCE RATING MINIMUM FIRE SEPARATION DISTANCE Walls Fire-resistance rated 1 hour - tested in accordance with ASTM E 119, UL 263, or Section 703.3 of the International Building Code with exposure from both sides 0 feet Not fire-resistance rated 0 hours ≥ 5 feet Not allowed NA < 2 feet Projections Fire-resistance rated 1 hour on the underside, or heavy timber, or fire-retardant-treated wood a,b,c ≥ 2 feet to < 5 feet Not fire-resistance rated 0 hours ≥ 5 feet Not allowed NA < 3 feet Openings in walls 25% Maximum of Wall Area 0 hours 3 feet Unlimited 0 hours 5 feet Penetrations All Comply with Section R302.4 < 3 feet None required 3 feet For SI: 1 foot = 304.8 mm. NA = Not Applicable. a The fire-resistance rating shall be permitted to be reduced to 0 hours on the underside of the eave overhang if fireblocking is provided from the wall top plate to the underside of the roof sheathing. b The fire-resistance rating shall be permitted to be reduced to 0 hours on the underside of the rake overhang where gable vent openings are not installed. c One hour on the underside equates to one layer of 5/8-inch type X gypsum sheathing. Openings are not allowed. TABLE R302.1(2) EXTERIOR WALLS - DWELLINGS WITH FIRE SPRINKLERS EXTERIOR WALL ELEMENT MINIMUM FIRE-RESISTANCE RATING MINIMUM FIRE SEPARATION DISTANCE Walls Fire-resistance rated 1 hour - tested in accordance with ASTM E 119, UL 263, or Section 703.3 of the International Building Code with exposure from the outside 0 feet Not fire-resistance rated 0 hours 3 feet a Not allowed NA < 2 feet Projections Fire-resistance rated 1 hour on the underside, or heavy timber, or fire-retardant-treated wood b,c,d 2 feet a Not fire-resistance rated 0 hours 3 feet Openings in walls Not allowed N/A < 3 feet Unlimited 0 hours 3 feet a Penetrations All Comply with Section R302.4 < 3 feet None required 3 feet a F rom the outside 0 feet Not fire-resistance rated 0 hours 3 feet a Not allowed NA < 2 feet Projections Fire-resistance rated 1 hour on the underside, or heavy timber, or fire-retardant-treated wood b,c,d 2 feet a Not fire-resistance rated 0 hours 3 feet Openings in walls Not allowed N/A < 3 feet Unlimited 0 hours 3 feet a Penetrations All Comply with Section R302.4 < 3 feet None required 3 feet a For SI: 1 foot = 304.8 mm. NA = Not Applicable. a For residential subdivisions where all dwellings are equipped throughout with an automatic sprinkler system installed in accordance with Section P2904, the fire separation distance for exterior walls not fire-resistance rated and for fire-resistance-rated projections shall be permitted to be reduced to 0 feet, and unlimited unprotected openings and penetrations shall be permitted, where the adjoining lot provides an open setback yard that is 6 feet or more in width on the opposite side of the property line. b The fire-resistance rating shall be permitted to be reduced to 0 hours on the underside of the eave overhang if fireblocking is provided from the wall top plate to the underside of the roof sheathing. c The fire-resistance rating shall be permitted to be reduced to 0 hours on the underside of the rake overhang where gable vent openings are not installed. d One hour on the underside equates to one layer of 5/8-inch type X gypsum sheathing. Openings are not allowed. Subp. 2. IRC section R302.2.3, Continuity. Section R302.2.3 is amended to read as follows: R302.2.3 Continuity. The fire-resistance-rated wall or assembly separating townhouses shall be continuous from the foundation to the underside of the roof sheathing, roof deck, or roof slab. The fire-resistance rating shall extend the full length of the wall or assembly, including wall extensions through and separating attached enclosed accessory structures. The separation shall extend through enclosed soffits, overhangs, and similar projections. Subp. 2a. IRC section R302.2.7 uses shall be continuous from the foundation to the underside of the roof sheathing, roof deck, or roof slab. The fire-resistance rating shall extend the full length of the wall or assembly, including wall extensions through and separating attached enclosed accessory structures. The separation shall extend through enclosed soffits, overhangs, and similar projections. Subp. 2a. IRC section R302.2.7. Section R302.2 is amended by adding a subsection to read as follows: R302.2.7 Sound transmission. Townhouses constructed in accordance with Section R302.2 shall comply with the sound transmission requirements of IRC Appendix K. Subp. 3. IRC section R302.3, Two-family dwellings. Section R302.3 is amended by adding a subsection to the end of the section to read as follows: R302.3.2 Sound transmission. Two-family dwellings constructed in accordance with Section R302.3 shall comply with the sound transmission requirements of IRC Appendix K. Subp. 4. IRC section R302.5.1, Opening protection. Section R305.5.1 is amended to read as follows: R302.5.1 Opening protection. Openings from a private garage directly into a room used for sleeping purposes shall not be permitted. Other openings between the garage and residence shall be equipped with solid wood doors not less than 1-3/8 inches (35 mm) in thickness, solid or honeycomb-core steel doors not less than 1-3/8 inches (35 mm) thick, or 20-minute fire-rated doors. Subp. 5. IRC section R302.6. Section R302.6 and Table R302.6 are amended to read as follows: R302.6 Dwelling/garage fire separation. The garage shall be separated as required by Table R302.6. Openings in garage walls shall comply with Section R302.5. TABLE R302.6 a DWELLING/GARAGE SEPARATION MATERIAL SEPARATION MATERIAL From the residence and attics Not less than 1/2-inch gypsum board or equivalent applied to the garage side. Vertical separation between the garage and the residence attic shall extend to the roof sheathing or rafter blocking all be separated as required by Table R302.6. Openings in garage walls shall comply with Section R302.5. TABLE R302.6 a DWELLING/GARAGE SEPARATION MATERIAL SEPARATION MATERIAL From the residence and attics Not less than 1/2-inch gypsum board or equivalent applied to the garage side. Vertical separation between the garage and the residence attic shall extend to the roof sheathing or rafter blocking. From all habitable rooms above the garage Not less than 5/8-inch type X gypsum board or equivalent. Structural members supporting floor/ceiling assemblies or garage ceiling used for separation required by this section Not less than 1/2-inch gypsum board or equivalent applied to the garage side of structural members supporting the floor/ceiling assemblies or garage ceiling. Structural members include, but are not limited to: walls, columns, beams, girders, and trusses. Garages located less than 3 feet from a dwelling unit on the same lot Not less than 1/2-inch gypsum board or equivalent applied to the interior side of exterior walls that are within this area. This provision does not apply to garage walls that are perpendicular to the adjacent dwelling unit wall. For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm. a Attachment of gypsum board shall comply with Table R702.3.5. ## Nearby sections - [Minn. R. 1309.0010 ADOPTION OF INTERNATIONAL RESIDENTIAL CODE (IRC) BY REFERENCE](https://www.frixlaw.com/law-library/statutes/STATE_MN_ADR_1309_0010.md) - [Minn. R. 1309.0020 REFERENCES TO OTHER ICC CODES](https://www.frixlaw.com/law-library/statutes/STATE_MN_ADR_1309_0020.md) - [Minn. R. 1309.0030 ADMINISTRATIVE PROCEDURE CRITERIA](https://www.frixlaw.com/law-library/statutes/STATE_MN_ADR_1309_0030.md) - [Minn. R. 1309.0100 CHAPTER 1, ADMINISTRATION](https://www.frixlaw.com/law-library/statutes/STATE_MN_ADR_1309_0100.md) - [Minn. R. 1309.0201 SECTION R201, GENERAL](https://www.frixlaw.com/law-library/statutes/STATE_MN_ADR_1309_0201.md) - [Minn. R. 1309.0202 SECTION R202, DEFINITIONS](https://www.frixlaw.com/law-library/statutes/STATE_MN_ADR_1309_0202.md) - [Minn. R. 1309.0300 SECTION R300, CLASSIFICATION](https://www.frixlaw.com/law-library/statutes/STATE_MN_ADR_1309_0300.md) - [Minn. R. 1309.0302 SECTION R302, FIRE-RESISTANT CONSTRUCTION](https://www.frixlaw.com/law-library/statutes/STATE_MN_ADR_1309_0302.md) - [Minn. R. 1309.0303 SECTION R303, LIGHT, VENTILATION, AND HEATING](https://www.frixlaw.com/law-library/statutes/STATE_MN_ADR_1309_0303.md) - [Minn. R. 1309.0305 SECTION R305, CEILING HEIGHT](https://www.frixlaw.com/law-library/statutes/STATE_MN_ADR_1309_0305.md) - [Minn. R. 1309.0307 SECTION R307, TOILET, BATH, AND SHOWER SPACES](https://www.frixlaw.com/law-library/statutes/STATE_MN_ADR_1309_0307.md) - [Minn. R. 1309.0309 SECTION R309, GARAGES AND CARPORTS](https://www.frixlaw.com/law-library/statutes/STATE_MN_ADR_1309_0309.md) - [Minn. R. 1309.0310 SECTION R310, EMERGENCY ESCAPE AND RESCUE OPENINGS](https://www.frixlaw.com/law-library/statutes/STATE_MN_ADR_1309_0310.md) - [Minn. R. 1309.0311 SECTION R311, MEANS OF EGRESS](https://www.frixlaw.com/law-library/statutes/STATE_MN_ADR_1309_0311.md) --- Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/STATE_MN_ADR_1309_0302. Check the current official text before relying on it. Not legal advice.