| 9.13.4. |
Soil Gas Control
(See Note A-9.13.4.) |
| 9.13.4.1. |
Application and Scope
- This Subsection applies to
- wall, roof and floor assemblies separating conditioned space from the ground, and
- the rough-in to allow the future protection of conditioned space that is separated from the ground by a wall, roof or floor assembly.
- This Subsection addresses the leakage of soil gas from the ground into the building.
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| 9.13.4.2. |
Protection from Soil Gas Ingress
- All wall, roof and floor assemblies separating conditioned space from the ground shall be protected by an air barrier system conforming to Subsection 9.25.3.
- Unless the space between the air barrier system and the ground is designed to be accessible for the future installation of a subfloor depressurization system, dwelling units and buildings containing residential occupancies shall be provided with the rough-in for a radon extraction system conforming to Article 9.13.4.3.
- Where buildings are used for occupancies other than those described in Sentence (2), protection from radon ingress and the means to address high radon concentrations in the future shall conform to
- Article 9.13.4.3., or
- Parts 5 and 6 (see Article 5.4.1.1. and 6.2.1.1.). (See Note A-9.13.4.2.(3).)
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| 9.13.4.3. |
Providing for the Rough-in for a Subfloor Depressurization System
(See Note A-9.13.4.3.)
- Floors-on-ground shall be provided with a rough-in for subfloor depressurization consisting of
- a gas-permeable layer, an inlet and an outlet as described in Sentence (2), or
- clean granular material and a pipe as described in Sentence (3).
- The rough-in referred to in Clause (1)(a) shall include
- a gas-permeable layer installed in the space between the air barrier and the ground to allow the depressurization of that space,
- an inlet that allows for the effective depressurization of the gas-permeable layer (see Note A-9.13.4.3.(2)(b) and (3)(b)(i)), and
- an outlet in the conditioned space that
- permits connection to depressurization equipment,
- is sealed to maintain the integrity of the air barrier system, and
- is clearly labeled to indicate that it is intended only for the removal of radon from below the floor-on-ground.
- The rough-in referred to in Clause (1)(b) shall include
- a) clean granular material installed below the floor-on-ground in accordance with Sentence 9.16.2.1.(1), and
- b) a pipe not less than 100 mm in diameter installed through the floor, such that
- i) its bottom end opens into the granular layer required Clause (a) at or near the centre of the floor and not less than 100 mm of granular material projects beyond the terminus of the pipe measured along its axis (see Note A-9.13.4.3.(2)(b) and (3)(b)(i)),
- ii) its top end permits connection to depressurization equipment and is provided with an airtight cap, and
- iii) the pipe is clearly labeled near the cap and, if applicable, every 1.8 m and at every change in direction to indicate that it is intended only for the removal of radon from below the floor-on-ground.
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