ADOPTS WITH AMENDMENTS:

International Residential Code 2018 (IRC 2018)

Part I — Administrative

Part II — Definitions

Part III — Building Planning and Construction

Part IV — Energy Conservation

Part V — Mechanical

Part VI — Fuel Gas

Part VII — Plumbing

Part VIII — Electrical

Part IX — Referenced Standards

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

User note:

About this chapter: Chapter 3 contains a wide array of building planning requirements that are critical to designing a safe and usable building. This includes, but is not limited to, requirements related to: general structural design, fire-resistant construction, light, ventilation, sanitation, plumbing fixture clearances, minimum room area and ceiling height, safety glazing, means of egress, automatic fire sprinkler systems, smoke and carbon monoxide alarm systems, accessibility, solar energy systems, swimming pools, spas and hot tubs.

Section R301 Design Criteria

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R301.1 Application

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R301.1.1 Alternative Provisions

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R301.1.2 Construction Systems

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R301.1.3 Engineered Design

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R301.2 Climatic and Geographic Design Criteria

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R301.2.1 Wind Design Criteria

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R301.2.1.1 Wind Limitations and Wind Design Required

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R301.2.1.1.1 Sunrooms

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R301.2.1.2 Protection of Openings

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R301.2.1.2.1 Application of ASTM E1996

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R301.2.1.3 Wind Speed Conversion

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R301.2.1.4 Exposure Category

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R301.2.1.5 Topographic Wind Effects

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R301.2.1.5.1 Simplified Topographic Wind Speed-Up Method

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R301.2.2 Seismic Provisions

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R301.2.2.1 Determination of Seismic Design Category

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R301.2.2.1.1 Alternate Determination of Seismic Design Category

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R301.2.2.1.2 Alternative Determination of Seismic Design Category E

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R301.2.2.2 Weights of Materials

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R301.2.2.3 Stone and Masonry Veneer

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R301.2.2.4 Masonry Construction

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R301.2.2.5 Concrete Construction

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R301.2.2.6 Irregular Buildings

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R301.2.2.7 Height Limitations

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R301.2.2.8 Cold-formed steel framing in Seismic Design Categories D0, D1 and D2

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R301.2.2.9 Masonry Chimneys

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R301.2.2.10 Anchorage of Water Heaters

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R301.2.3 Snow Loads

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R301.2.4 Floodplain Construction

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R301.2.4.1 Alternative Provisions

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R301.3 Story Height

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R301.4 Dead Load

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R301.5 Live Load

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R301.6 Roof Load

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R301.7 Deflection

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R301.8 Nominal Sizes

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Section R302 Fire-Resistant Construction

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R302.1 Exterior Walls

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R302.2 Townhouses

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R302.2.1 Double Walls

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R302.2.2 Common Walls

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R302.2.3 Continuity

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R302.2.4 Parapets for Townhouses

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R302.2.5 Parapet Construction

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R302.2.6 Structural Independence

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R302.3 Two-Family Dwellings

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R302.3.1 Supporting Construction

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R302.4 Dwelling Unit Rated Penetrations

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R302.4.1 Through Penetrations

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R302.4.1.1 Fire-Resistance-Rated Assembly

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R302.4.1.2 Penetration Firestop System

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R302.4.2 Membrane Penetrations

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R302.5 Dwelling-Garage Opening and Penetration Protection

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R302.5.1 Opening Protection

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R302.5.2 Duct Penetration

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R302.5.3 Other Penetrations

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R302.6 Dwelling-Garage Fire Separation

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R302.7 Under-Stair Protection

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R302.8 Foam Plastics

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R302.9 Flame Spread Index and Smoke-Developed Index for Wall and Ceiling Finishes

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R302.9.1 Flame Spread Index

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R302.9.2 Smoke-Developed Index

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R302.9.3 Testing

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R302.9.4 Alternative Test Method

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R302.10 Flame Spread Index and Smoke-Developed Index for Insulation

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R302.10.1 Insulation

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R302.10.2 Loose-Fill Insulation

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R302.10.3 Cellulosic Fiber Loose-Fill Insulation

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R302.10.4 Exposed Attic Insulation

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R302.10.5 Testing

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R302.11 Fireblocking

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R302.11.1 Fireblocking Materials

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R302.11.1.1 Batts or Blankets of Mineral or Glass Fiber

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R302.11.1.2 Unfaced Fiberglass

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R302.11.1.3 Loose-Fill Insulation Material

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R302.11.2 Fireblocking Integrity

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R302.12 Draftstopping

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R302.12.1 Materials

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R302.13 Fire Protection of Floors

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R302.14 Combustible Insulation Clearance

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Section R303 Light, Ventilation and Heating

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R303.1 Habitable Rooms

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R303.2 Adjoining Rooms

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R303.3 Bathrooms

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R303.4 Mechanical Ventilation

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R303.5 Opening Location

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R303.5.1 Intake Openings

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R303.5.2 Exhaust Openings

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R303.6 Outside Opening Protection

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R303.7 Interior Stairway Illumination

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R303.8 Exterior Stairway Illumination

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R303.9 Required Glazed Openings

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R303.9.1 Sunroom Additions

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R303.10 Required Heating

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Section R304 Minimum Room Areas

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R304.1 Minimum Area

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R304.2 Minimum Dimensions

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R304.3 Height Effect on Room Area

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Section R305 Ceiling Height

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R305.1 Minimum Height

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Habitable space, hallways and portions of basements containing these spaces shall have a ceiling height of not less than 7 feet (2134 mm). Bathrooms, toilet rooms and laundry rooms shall have a ceiling height of not less than 6 feet 8 inches (2032 mm).


Exceptions:

  1. For rooms with sloped ceilings, the required floor area of the room shall have a ceiling height of not less than 5 feet (1524 mm) and not less than 50 percent of the required floor area shall have a ceiling height of not less than 7 feet (2134 mm).
  2. The ceiling height above bathroom and toilet room fixtures shall be such that the fixture is capable of being used for its intended purpose. A shower or tub equipped with a showerhead shall have a ceiling height of not less than 6 feet 8 inches (2032 mm) above an area of not less than 30 inches (762 mm) by 30 inches (762 mm) at the showerhead.

R305.1.1 Basements

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Every dwelling unit shall be provided with a water closet, lavatory, and a bathtub or shower.
Each dwelling unit shall be provided with a kitchen area and every kitchen area shall be provided with a sink.
Plumbing fixtures shall be connected to a sanitary sewer or to an approved private sewage disposal system.
Plumbing fixtures shall be connected to an approved water supply. Kitchen sinks, lavatories, bathtubs, showers, bidets, laundry tubs and washing machine outlets shall be provided with hot and cold water.

Section R307 Toilet, Bath and Shower Spaces

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R307.1 Space Required

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R307.2 Bathtub and Shower Spaces

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Section R308 Glazing

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R308.1 Identification

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R308.1.1 Identification of Multiple Assemblies

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R308.2 Louvered Windows or Jalousies

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R308.2.1 Wired Glass Prohibited

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R308.3 Human Impact Loads

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R308.3.1 Impact Test

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R308.4 Hazardous Locations

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R308.4.1 Glazing in Doors

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R308.4.2 Glazing Adjacent to Doors

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R308.4.3 Glazing in Windows

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R308.4.4 Glazing in Guards and Railings

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R308.4.4.1 Structural Glass Baluster Panels

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R308.4.5 Glazing and Wet Surfaces

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R308.4.6 Glazing Adjacent to Stairs and Ramps

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R308.4.7 Glazing Adjacent to the Bottom Stair Landing

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R308.5 Site-Built Windows

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R308.6 Skylights and Sloped Glazing

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R308.6.1 Definitions

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R308.6.2 Materials

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R308.6.3 Screens, General

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R308.6.4 Screens With Multiple Glazing

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R308.6.5 Screens Not Required

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R308.6.6 Glass in Greenhouses

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R308.6.7 Screen Characteristics

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R308.6.8 Curbs for Skylights

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R308.6.9 Testing and Labeling

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R308.6.9.1 Comparative Analysis for Glass-Glazed Unit Skylights

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Section R309 Garages and Carports

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R309.1 Floor Surface

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R309.2 Carports

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R309.3 Flood Hazard Areas

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R309.4 Automatic Garage Door Openers

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R309.5 Fire Sprinklers

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Section R310 Emergency Escape and Rescue Openings

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R310.1 Emergency Escape and Rescue Opening Required

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R310.1.1 Operational Constraints and Opening Control Devices

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R310.2 Emergency Escape and Rescue Openings

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R310.2.1 Minimum Opening Area

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R310.2.2 Window Sill Height

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R310.2.3 Window Wells

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R310.2.3.1 Ladder and Steps

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R310.2.3.2 Drainage

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R310.2.4 Emergency Escape and Rescue Openings Under Decks and Porches

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R310.2.5 Replacement Windows

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R310.3 Emergency Escape and Rescue Doors

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R310.3.1 Minimum Door Opening Size

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R310.3.2 Area Wells

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R310.3.2.1 Ladder and Steps

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R310.3.2.2 Drainage

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R310.4 Bars, Grilles, Covers and Screens

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R310.5 Dwelling Additions

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R310.6 Alterations or Repairs of Existing Basements

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Section R311 Means of Egress

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R311.1 Means of Egress

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R311.2 Egress Door

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R311.3 Floors and Landings at Exterior Doors

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R311.3.1 Floor Elevations at the Required Egress Doors

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R311.3.2 Floor Elevations at Other Exterior Doors

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R311.3.3 Storm and Screen Doors

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R311.4 Vertical Egress

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R311.5 Landing, Deck, Balcony and Stair Construction and Attachment

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R311.6 Hallways

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R311.7 Stairways

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R311.7.1 Width

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R311.7.2 Headroom

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R311.7.3 Vertical Rise

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R311.7.4 Walkline

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R311.7.5 Stair Treads and Risers

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R311.7.5.1 Risers

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R311.7.5.2 Treads

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R311.7.5.2.1 Winder Treads

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R311.7.5.3 Nosings

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R311.7.5.4 Exterior Plastic Composite Stair Treads

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R311.7.6 Landings for Stairways

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R311.7.7 Stairway Walking Surface

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R311.7.8 Handrails

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R311.7.8.1 Height

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R311.7.8.2 Handrail Projection

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R311.7.8.3 Handrail Clearance

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R311.7.8.4 Continuity

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R311.7.8.5 Grip Size

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R311.7.8.6 Exterior Plastic Composite Handrails

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R311.7.9 Illumination

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R311.7.10 Special Stairways

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R311.7.10.1 Spiral Stairways

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R311.7.10.2 Bulkhead Enclosure Stairways

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R311.7.11 Alternating Tread Devices

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R311.7.11.1 Treads of Alternating Tread Devices

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R311.7.11.2 Handrails of Alternating Tread Devices

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R311.7.12 Ships Ladders

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R311.7.12.1 Treads of Ships Ladders

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R311.7.12.2 Handrails of Ships Ladders

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R311.8 Ramps

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R311.8.1 Maximum Slope

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R311.8.2 Landings Required

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R311.8.3 Handrails Required

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R311.8.3.1 Height

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R311.8.3.2 Grip Size

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R311.8.3.3 Continuity

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Section R312 Guards and Window Fall Protection

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R312.1 Guards

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R312.1.1 Where Required

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R312.1.2 Height

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R312.1.3 Opening Limitations

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R312.1.4 Exterior Plastic Composite Guards

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R312.2 Window Fall Protection

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R312.2.1 Window Sills

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R312.2.2 Window Opening Control Devices

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Section R313 Automatic Fire Sprinkler Systems

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R313.1 Townhouse Automatic Fire Sprinkler Systems

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R313.1.1 Design and Installation

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R313.2 One- And Two-Family Dwellings Automatic Fire Sprinkler Systems

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R313.2.1 Design and Installation

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Section R314 Smoke Alarms

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R314.1 General

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R314.1.1 Listings

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R314.2 Where Required

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R314.2.1 New Construction

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R314.2.2 Alterations, Repairs and Additions

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R314.3 Location

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R314.3.1 Installation Near Cooking Appliances

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R314.4 Interconnection

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R314.5 Combination Alarms

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R314.6 Power Source

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R314.7 Fire Alarm Systems

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R314.7.1 General

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R314.7.2 Location

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R314.7.3 Permanent Fixture

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R314.7.4 Combination Detectors

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Section R315 Carbon Monoxide Alarms

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R315.1 General

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R315.1.1 Listings

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R315.2 Where Required

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R315.2.1 New Construction

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R315.2.2 Alterations, Repairs and Additions

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R315.3 Location

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R315.4 Combination Alarms

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R315.5 Interconnectivity

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R315.6 Power Source

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R315.7 Carbon Monoxide Detection Systems

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R315.7.1 General

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R315.7.2 Location

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R315.7.3 Permanent Fixture

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R315.7.4 Combination Detectors

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Section R316 Foam Plastic

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R316.1 General

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R316.2 Labeling and Identification

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R316.3 Surface Burning Characteristics

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R316.4 Thermal Barrier

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R316.5 Specific Requirements

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R316.5.1 Masonry or Concrete Construction

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R316.5.2 Roofing

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R316.5.3 Attics

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R316.5.4 Crawl Spaces

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R316.5.5 Foam-Filled Exterior Doors

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R316.5.6 Foam-Filled Garage Doors

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R316.5.7 Foam Backer Board

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R316.5.8 Re-siding

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R316.5.9 Interior Trim

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R316.5.10 Interior Finish

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R316.5.11 Sill Plates and Headers

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R316.5.12 Sheathing

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R316.5.13 Floors

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R316.6 Specific Approval

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R316.7 Termite Damage

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R316.8 Wind Resistance

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Section R317 Protection of Wood and Wood-Based Products Against Decay

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R317.1 Location Required

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R317.1.1 Field Treatment

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R317.1.2 Ground Contact

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R317.1.3 Geographical Areas

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R317.1.4 Wood Columns

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R317.1.5 Exposed Glued-Laminated Timbers

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R317.2 Quality Mark

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R317.2.1 Required Information

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R317.3 Fasteners and Connectors in Contact With Preservative-Treated and Fire-Retardant-Treated Wood

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R317.3.1 Fasteners for Preservative-Treated Wood

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R317.3.2 Fastenings for Wood Foundations

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R317.3.3 Fasteners for Fire-Retardant-Treated Wood Used in Exterior Applications or Wet or Damp Locations

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R317.3.4 Fasteners for Fire-Retardant-Treated Wood Used in Interior Applications

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R317.4 Plastic Composites

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Section R318 Protection Against Subterranean Termites

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R318.1 Subterranean Termite Control Methods

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R318.1.1 Quality Mark

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R318.1.2 Field Treatment

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R318.2 Chemical Termiticide Treatment

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R318.3 Barriers

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R318.4 Foam Plastic Protection

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Section R319 Site Address

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R319.1 Address Identification

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Section R320 Accessibility

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R320.1 Scope

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R320.1.1 Guestrooms

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Section R321 Elevators and Platform Lifts

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R321.1 Elevators

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R321.2 Platform Lifts

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R321.3 Accessibility

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Section R322 Flood-Resistant Construction

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R322.1 General

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R322.1.1 Alternative Provisions

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R322.1.2 Structural Systems

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R322.1.3 Flood-Resistant Construction

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R322.1.4 Establishing the Design Flood Elevation

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R322.1.4.1 Determination of Design Flood Elevations

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R322.1.4.2 Determination of Impacts

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R322.1.5 Lowest Floor

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R322.1.6 Protection of Mechanical, Plumbing and Electrical Systems

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R322.1.7 Protection of Water Supply and Sanitary Sewage Systems

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R322.1.8 Flood-Resistant Materials

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R322.1.9 Manufactured Homes

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R322.1.10 As-Built Elevation Documentation

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R322.2 Flood Hazard Areas (Including A Zones)

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R322.2.1 Elevation Requirements

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R322.2.2 Enclosed Area Below Design Flood Elevation

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R322.2.2.1 Installation of Openings

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R322.2.3 Foundation Design and Construction

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R322.2.4 Tanks

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R322.3 Coastal High-Hazard Areas (Including V Zones and Coastal A Zones, Where Designated)

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R322.3.1 Location and Site Preparation

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R322.3.2 Elevation Requirements

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R322.3.3 Foundations

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R322.3.4 Concrete Slabs

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R322.3.5 Walls Below Design Flood Elevation

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R322.3.6 Enclosed Areas Below Design Flood Elevation

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R322.3.6.1 Protection of Building Envelope

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R322.3.7 Stairways and Ramps

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R322.3.8 Decks and Porches

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R322.3.9 Construction Documents

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R322.3.10 Tanks

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Section R323 Storm Shelters

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R323.1 General

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Section R324 Solar Energy Systems

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R324.1 General

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R324.2 Solar Thermal Systems

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R324.3 Photovoltaic Systems

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R324.3.1 Equipment Listings

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R324.4 Rooftop-Mounted Photovoltaic Systems

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R324.4.1 Structural Requirements

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R324.4.1.1 Roof Load

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R324.4.1.2 Wind Load

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R324.4.2 Fire Classification

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R324.4.3 Roof Penetrations

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R324.5 Building-Integrated Photovoltaic Systems

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R324.5.1 Photovoltaic Shingles

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R324.5.2 Fire Classification

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R324.6 Roof Access and Pathways

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R324.6.1 Pathways

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R324.6.2 Setback at Ridge

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R324.6.2.1 Alternative Setback at Ridge

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R324.6.2.2 Emergency Escape and Rescue Opening

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R324.7 Ground-Mounted Photovoltaic Systems

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R324.7.1 Fire Separation Distances

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Section R325 Mezzanines

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R325.1 General

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R325.2 Mezzanines

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R325.3 Area Limitation

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R325.4 Means of Egress

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R325.5 Openness

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R325.6 Habitable Attic

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Section R326 Swimming Pools, Spas and Hot Tubs

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R326.1 General

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Section R327 Stationary Storage Battery Systems

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R327.1 General

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R327.2 Equipment Listings

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R327.3 Installation

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R327.4 Electrical Installation

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R327.5 Ventilation

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R327.6 Protection From Impact

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