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// CODE SNIPPET

Section AF103 Passive Radon-Resistant System Requirements

2015 Michigan Residential Code > F Passive Radon Gas Controls > AF103 Passive Radon-Resistant System Requirements
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AF103.1 General

The following components of a passive submembrane or subslab depressurization system shall be installed during construction.

AF103.2 Entry Routes

Potential radon entry routes shall be closed in accordance with Sections AF103.2.1 through AF103.2.8.

AF103.2.1 Floor Openings

Openings around bathtubs, showers, water closets, pipes, wires or other objects that penetrate concrete slabs, or other floor assemblies, shall be filled with a polyurethane caulk or expanding foam applied in accordance with the manufacturer's instructions.

AF103.2.2 Sumps

Sumps open to soil or serving as the termination point for subslab or exterior drain tile loops shall be covered with a gasketed or sealed lid. Sumps used as the suction point in a subslab depressurization system shall have a lid designed to accommodate the vent pipe. Sumps used as a floor drain shall have a lid equipped with a trapped inlet.

AF103.2.3 Foundation Walls

Hollow block masonry foundation walls shall be constructed with a continuous course of solid masonry, one course of masonry grouted solid, or a solid concrete beam at or above grade. Where a brick veneer or other masonry ledge is installed, the course immediately below that ledge shall be solid masonry, one course of masonry grouted solid, or a solid concrete beam. Joints, cracks or other openings around penetrations of both exterior and interior surfaces of foundation walls below grade shall be filled with polyurethane caulk.

AF103.2.4 Dampproofing

The exterior surfaces of foundation walls below grade shall be dampproofed in accordance with Section R406.

AF103.2.5 Air-Conditioning Systems

Entry points, joints or other openings into air-conditioning systems in enclosed crawl spaces shall be sealed.

Exception: Systems with gasketed seams or that are otherwise sealed by the manufacturer.

AF103.2.6 Ducts

Ductwork passing through or beneath a slab within a dwelling shall be of seamless material unless the air-conditioning system is designed to maintain continuous positive pressure within such ducting. Joints in such ductwork shall be sealed.

     Ductwork located in enclosed crawl spaces shall have seams and joints sealed by closure systems in accordance with Section M1601.4.1.

AF103.2.7 Crawl Space Access

Access doors and other openings or penetrations between basements and adjoining crawl spaces shall be closed, gasketed or sealed.

AF103.3 Basements or Enclosed Crawl Spaces With Soil Floors

In dwellings with basements or enclosed crawl spaces with soil floors, the following components of a passive submembrane depressurization system shall be installed during construction.

Exception: Basements or enclosed crawl spaces that are provided with a continuously operated mechanical exhaust system in accordance with Section R408.3.

AF103.3.1 Soil-Gas-Retarder

The soil in basements and enclosed crawl spaces shall be covered with a soil-gasretarder. The soil-gas-retarder shall be lapped not less than 12 inches (305 mm) at joints and shall extend to foundation walls enclosing the basement or crawl space. The soilgas- retarder shall fit closely around any pipe, wire or other penetrations of the material. Punctures or tears in the material shall be sealed or covered with additional sheeting.

AF103.3.2 "T" Fitting and Vent Pipe

A 3- or 4-inch "T" fitting shall be inserted beneath the soil-gas-retarder and be connected to a vent pipe. The vent pipe shall extend through the conditioned space of the dwelling and terminate not less than 12 inches (305 mm) above the roof in a location not less than 10 feet (3048 mm) away from any window or other opening into the conditioned spaces of the building that is less than 2 feet (610 mm) below the exhaust point.

AF103.4 Basements or Enclosed Crawl Spaces With Concrete Floors or Other Floor Systems and Slab-on-Grade Dwellings

The following components of a passive subslab depressurization system shall be installed during construction in slab-on-grade dwellings or in dwellings with basements or crawl spaces with concrete or other floor systems.

AF103.4.1 Sub-Slab Preparation

A layer of gas-permeable material shall be placed under concrete slabs and other floor systems that directly contact the ground and are within the walls of the dwelling.

AF103.4.2 Soil-Gas-Retarder

A soil-gas-retarder shall be placed on top of the gas-permeable layer prior to casting the slab or placing the floor assembly. The soil-gasretarder shall cover the entire floor area with separate sections lapped not less than 12 inches (305 mm). The soilgas- retarder shall fit closely around any pipe, wire, or other penetrations of the material. Punctures or tears in the material shall be sealed or covered.

AF103.4.3 "T" Fitting and Vent Pipe

Before a slab is cast or other floor system is installed, a "T" fitting shall be inserted below the slab or other floor system and the soilgas- retarder. The "T" fitting shall be connected to a vent pipe. The vent pipe shall extend through the conditioned space of the dwelling and terminate not less than 12 inches (305 mm) above the roof in a location not less than 10 feet (3048 mm) away from any window or other opening into the conditioned spaces of the building that is less than 2 feet (610 mm) below the exhaust point.

AF103.5 Drain Tile and Sump Used for Depressurization

As an alternative to inserting a vent pipe into a "T" fitting, a vent pipe shall be permitted to be inserted directly into an interior perimeter drain tile loop or through a sump cover where the drain tile or sump is exposed to the gas-permeable layer.

AF103.6 Multiple Vent Pipes

In dwellings where interior footings or other barriers separate the gas-permeable layer, each area shall be fitted with an individual vent pipe. Vent pipes shall connect to a single vent that terminates above the roof or each individual vent pipe shall terminate separately above the roof.

AF103.7 Combination Foundations

Where basement or crawl space floors are on different levels, each level shall have a separate vent pipe. Multiple vent pipes shall be permitted to be connected to a single vent pipe that terminates above the roof.

AF103.8 Vent Pipe Drainage

Components of the radon vent pipe system shall be installed to provide positive drainage to the ground beneath the soil-gas-retarder.

AF103.9 Vent Pipe Identification

Exposed and visible interior vent pipes shall be identified with not less than one label on each floor and in accessible attics. The label shall read: "Radon Reduction System."

AF103.10 Power Source and Access for Future Radon Fan

To provide for future installation of a radon fan, an electrical circuit terminated in an approved box shall be installed during construction in the anticipated location of the radon fans. An accessible clear space 24 inches (610 mm) in diameter by 3 feet (914 mm) in height adjacent to the vent pipe shall be provided at the anticipated location of a future radon fan.

Related Code Sections


Section AF103 Passive Radon Gas Controls, Passive Radon-Resistant System Requirements
The following components of a passive submembrane or subslab depressurization system shall be installed during construction ...
2015 Michigan Residential Code > F Passive Radon Gas Controls > AF103 Passive Radon-Resistant System Requirements
AF103.10 Passive Radon Gas Controls, Power Source and Access for Future Radon Fan
To provide for future installation of a radon fan, an electrical circuit terminated in an approved box shall be installed during construction ...
2015 Michigan Residential Code > F Passive Radon Gas Controls > AF103 Passive Radon-Resistant System Requirements > AF103.10 Power Source and Access for Future Radon Fan
AF103.3 Passive Radon Gas Controls, Basements or Enclosed Crawl Spaces With Soil Floors
In dwellings with basements or enclosed crawl spaces with soil floors, the following components of a passive submembrane depressurization system ...
2015 Michigan Residential Code > F Passive Radon Gas Controls > AF103 Passive Radon-Resistant System Requirements > AF103.3 Basements or Enclosed Crawl Spaces With Soil Floors
AF103.5 Passive Radon Gas Controls, Drain Tile and Sump Used for Depressurization
As an alternative to inserting a vent pipe into a "T" fitting, a vent pipe shall be permitted to be inserted directly into an interior perimeter drain ...
2015 Michigan Residential Code > F Passive Radon Gas Controls > AF103 Passive Radon-Resistant System Requirements > AF103.5 Drain Tile and Sump Used for Depressurization
AF103.6 Passive Radon Gas Controls, Multiple Vent Pipes
In dwellings where interior footings or other barriers separate the gas-permeable layer, each area shall be fitted with an individual vent pipe. Vent ...
2015 Michigan Residential Code > F Passive Radon Gas Controls > AF103 Passive Radon-Resistant System Requirements > AF103.6 Multiple Vent Pipes
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