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// CODE SNIPPET

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

2015 Michigan Residential Code > F Passive Radon Gas Controls > AF103 Passive Radon-Resistant System Requirements > AF103.4 Basements or Enclosed Crawl Spaces With Concrete Floors or Other Floor Systems and Slab-On-Grade Dwellings
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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.

Related Code Sections


AF103.4 Passive Radon Gas Controls, Basements or Enclosed Crawl Spaces With Concrete Floors or Other Floor Systems and Slab-On-Grade Dwellings
or in dwellings with basements or crawl spaces with concrete or other floor systems ...
2015 Michigan Residential Code > F Passive Radon Gas Controls > AF103 Passive Radon-Resistant System Requirements > AF103.4 Basements or Enclosed Crawl Spaces With Concrete Floors or Other Floor Systems and Slab-On-Grade Dwellings
AF103.2 Passive Radon Gas Controls, Entry Routes
Entry points, joints or other openings into air-conditioning systems in enclosed crawl spaces ...
2015 Michigan Residential Code > F Passive Radon Gas Controls > AF103 Passive Radon-Resistant System Requirements > AF103.2 Entry Routes
Section R506 Floors, Concrete Floors (On Ground)
Concrete slab-on-ground floors shall be designed and constructed in accordance with the provisions of this section or ACI 332. Floors shall ...
2015 Michigan Residential Code > 5 Floors > R506 Concrete Floors (On Ground)
R506.2 Floors, Site Preparation
be placed on the prepared sub-grade where the slab is below grade. Exception: A base course is not required where the concrete slab is installed ...
2015 Michigan Residential Code > 5 Floors > R506 Concrete Floors (On Ground) > R506.2 Site Preparation
R403.4.2 Foundations, Concrete Footings
Concrete footings shall be installed in accordance with Section R403.1 and Figure R403.4(2). FIGURE R403.4(2) BASEMENT OR CRAWL SPACE ...
2015 Michigan Residential Code > 4 Foundations > R403 Footings > R403.4 Footings for Precast Concrete Foundations > R403.4.2 Concrete Footings
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