Building Code Descriptions

Above Ground Wiring Installation

NM, UF, AC, and MC Cable Installation
1. Use NM, UF, AC, and MC cable where the cable is not subject to physical damage. Physical damage can occur unless the cable is covered by drywall or by other material or unless the cable is run in conduit or tubing. Physical damage includes damage by sunlight. Read the full Topic

Access to Mechanical Appliances


1. Apply the provisions of this chapter to heating and cooling equipment that is not covered in other chapters. This means you should apply this chapter unless something in another chapter specifically addresses or contradicts this chapter. This chapter covers general installation requirements for central heating and cooling equipment and for water heaters. See Chapters 14 and 18 for specific requirements covering appliances such as oil-fired furnaces, heat pumps, and electric heaters. See Chapters 20 and 28 for additional water heater requirements. See Chapter 24 for additional requirements for gas-fired appliances.
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1. Provide disability accessibility features as required by the International Building Code for Group R-3 occupancy when at least () 4 dwelling or sleeping units are located in one building. This means that one and two-family homes and townhomes with fewer than (<) four units in one building need not have disability accessibility features.

Adding or Removing Gas Appliances from Chimneys and Vents

Appliances Governed by these Code Provisions
Apply these code provisions to chimneys and vents used by gas-burning appliances. Note that similar provisions for solid and liquid fuel-burning appliances exist in IRC Chapter 18. Read the full Topic

Adding or Removing Liquid and Solid-Fuel Appliances From Chimneys and Vents

Description of Potential Problems when Adding or Removing Fuel-Burning Appliances
Every fuel-burning appliance has diff erent characteristics that will aff ect the operation of a chimney or vent. Adding or removing appliances may cause a chimney or vent that once operated properly to operate improperly. Problems that may occur include backdrafting of exhaust gasses into the home and condensation of moisture that can quickly damage the chimney or vent. Backdrafting and damaged chimneys and vents are a signifi cant safety hazard. Read the full Topic

Air Admittance Valves

General Installation Requirements and Approved Uses
1. Install air admittance valves according to manufacturer’s installation instructions and provisions of the IRC.
2. You may use air admittance valves to vent individual vents, branch vents, circuit vents, and stack vents. Use individual and branch type air admittance valves to vent fixtures that are on the same floor level and that are connected to a horizontal branch drain.
3. Use air admittance valves that are rated for the vent size to which the valve is connected.
4. Install air admittance valves within 15


Air Conditioning Condensate Disposal

Condensate Description
The process of removing heat from the air is often called air conditioning. Water is a byproduct of air conditioning because water vapor condenses out from the air when the air temperature is reduced. In areas with high humidity, air conditioning can produce signifi cant amounts of water. The water removed from the air during air conditioning is called condensate. Read the full Topic

Alterations and Repairs to Existing Buildings

1. Make additions, alterations, renovations, and repairs to existing buildings comply with the new energy efficiency requirements. Existing buildings and systems need not be updated to comply with new the energy effi ciency requirements. Example: a screened porch is enclosed and made into conditioned space. The porch must comply with the new energy efficiency requirements but the rest of the building need not comply.
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Appliance Installation

Appliance Installation Using Flexible Cords
1. Install appliances according to manufacturer’s installation instructions.
2. Provide a dedicated branch circuit for a fl exible cord connected range hood.
3. Use the following table to determine the length of flexible cords that serve appliances listed for use with flexible cords. Read the full Topic

Appliance Installation, Anchorage, Elevation, and Protection

Appliances Governed by these Code Provisions                                                                                                                                                                                                                                                1. Apply these code provisions to all fuel-burning mechanical appliances including appliances using natural and propane gas, oil, and solid fuels.
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Application of the Material in This Chapter

This IRC chapter applies to electrical equipment near or associated with swimming pools including above ground and below ground pools, indoor and outdoor pools, and permanent and temporary pools. This chapter also applies to spas, hot tubs, whirlpool bathtubs, decorative water fountains, and other bodies of water such as fi sh ponds and refl ecting pools.

Asphalt (Fiberglass) Shingle Roof Covering Materials

Shingle Roof Covering Description

Shingle roof covering materials discussed in this section are the fiberglass strip shingles used in modern residential construction. Strip shingles are the most common roof covering material in modern residential construction. Roof slopes are shown as x/y where x is the number of vertical units rise and y is the number of
horizontal units run. A 4/12 roof has 4 vertical units rise for every 12 horizontal units run. Read the full Topic

Attic Access

Attic Access Requirements

1. Provide an access opening to every attic with at least () 30 square feet of attic area and a vertical height of at least () 30 inches at some point in the 30 square feet. Measure the vertical height from the top of the ceiling joists (or truss bottom chord) to the bottom of the rafters (or truss top chord). Read the full Topic

Attic Ventilation

Attic Ventilation Requirements

1. Provide ventilation to attic spaces, unless you design and build the attic as an unventilated, conditioned attic assembly. Provide ventilation when ceilings are applied directly to roof rafters, such as cathedral and vaulted ceilings, and in attics over unconditioned spaces, such as garage attics. Provide ventilation to each individual attic and ceiling space, unless there is eff ective means for air to move between spaces. The building official may waive att ic ventilation requirements. Read the full Topic

Backflow Protection by Air Gaps

Air Gap Required Locations
1. Use clothes washing and dish-washing machines that contain an air gap device in the machine.
2. Provide an air gap at the discharge point of any relief valve and any relief valve piping (such as a water heater temperature and pressure relief valve discharge pipe).

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Backflow Protection of Water Supply

Backflow and Cross-Connections Discussion
An important part of the design and use of the drinking (potable) water supply system is preventing contamination of potable water. Contamination can occur when the potable water supply is intentionally or unintentionally connected to a contaminant source. A cross-connection is a connection between the potable water supply and a potential contaminant source. Backflow is when material (usually liquid) travels in the reverse of the intended direction within a cross-connection. Contamination occurs when contaminated material backfl ows into the potable water system through a cross-connection. Some cross-connections are intended. Examples of intended cross-connections include toilet tank fill valves, automatic fill systems for swimming pools, and lawn irrigation systems.

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Backflow Protection Using Backflow Prevention Devices

Backflow Protection Device General Installation Requirements
1. Protect all drinking (potable) water supply openings, outlets, and connections by an air gap or by an approved backfl ow preventer. This means that any place from which water flows must have either an air gap or have a backfl ow preventer installed. Examples of openings, outlets and connections include sinks, bathtubs, showers, hose bibbs, and water supply connections to water and steam heating systems, irrigation systems, swimming pools, fountains, ponds, and similar water features.
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Backwater Valves

Backwater Valves
1. Install a backwater valve to protect fixtures whose flood rim level is below the closest upstream public sewer manhole cover.
2. Install the backwater valve in the building drain or in any branch drain that serves the fixtures requiring protection.
3. Do not discharge fixtures that have flood rim levels above the closest upstream manhole cover
through the backwater valve.
4. Provide access to the backwater valve through a water tight cover.
5. Use only approved backwater valves constructed with parts that will not corrode and will provide a positive mechanical seal.
6. Install a backwater valve that has at least (≥) the same capacity as the pipes served.


Bathroom Light and Ventilation

Bathroom Light and Ventilation

1. Provide outdoor light and ventilation to bathrooms, toilet rooms, and similar areas using windows or doors containing glazing. Provide a total glazing area of at least () 3 square feet

with atleast () 1 ½ square feet operable. Open the glazing directly on to a street, public alley, or on to a yard or court located on the same lot. Read the full Topic

Below Ground Wiring Installation

Below Ground Wiring Burial Depth
1. The following table lists how much cover is required for wiring and conduit buried underground. Depths are in inches.

Protection where Wires Emerge from Ground
1. Protect wires where they emerge from the ground using enclosures or raceways beginning at the wire’s minimum burial depth or at least (≥) 18 inches below where the wires emerge from the ground, whichever is less. Extend the protection to at least (≥) 8 feet above fi nished grade.
2. Protect wires at the point where they enter the building. Read the full Topic