The Ontario Building Code | Radon
9.1.1.7. Radon
(1) In addition to all other requirements, a building in the following designated areas shall be designed and constructed so that the annual average concentration of radon 222 does not exceed 200 Bq/m3of air and the annual average concentration of the short lived daughters of radon 222 does not exceed 0.02 working levels inside the buildingfor,
(a) the City of Elliot Lake in the Territorial District of Algoma,
(b) the Township of Faraday in the County of Hastings, and
(c) the geographic Township of Hyman in the Territorial District of Sudbury.
In Plain Language
Buildings must address radon, a naturally occurring radioactive gas, per the requirements referenced in this article, protecting occupants from long-term exposure.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.