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Radon Protocols

Canadian Guideline for Exposure to Radon in Indoor Air, June 2007

In March 2006, the Radon Working Group of the Federal Provincial Territorial Radiation Protection Committee proposed the following radon guidelines:

  • Remedial measures should be undertaken in a dwelling whenever the average annual radon concentration exceeds
    200 Bq/m3.

  • The higher the radon concentration, the sooner remedial measures should be undertaken.

  • When remedial action is taken, the radon level should be reduced to a value as low as practicable.

  • The construction of new dwellings should employ techniques that will minimize radon entry and will facilitate
    post-construction radon removal, should this subsequently prove necessary.

These recommendations have resulted in the current Canadian radon guideline of 200 Bq/m3.

Canadian Radon Measurement Protocols Issued by Health Canada

E-PERM detectors are the ideal screening method for determining whether remedial action is required, in accordance with Canadian radon measurement guidelines.

  1. Guide for Radon Measurements in Public Buildings   (New Version January, 2016)

  2. Guide for Radon Measurements in Residential Dwellings

Canadian Radon Mitigation Protocol Issued by Health Canada

Reducing Radon Levels in Existing Homes

A Canadian Guide for Professional Contractors (pdf)    

World Health Organization (WHO)

The WHO has issued a comprehensive booklet on the hazards of indoor radon. "To limit the risk to individuals a national reference level of 100 Bq/m3 is recommended."

For a summary of the WHO booklet, click here (pdf) Adobe logo - pdf file

Tarion Home Warranty Coverage

Radon gas is included in the Tarion New Home Warranty which applies to new homes in Ontario. Home owners should arrange for a short-term radon test well within the first year of the warranty and then initiate a claim if the radon level is above 200 Bq/m3. The  radon level will need to be confirmed with a long-term test by a certified C-NRPP inspector.

In years 2 to 7, the claim needs to include specific building code violations (for basement construction), which may not necessarily be present. For this reason, testing the home for radon early in the first year of the warranty is important.

For a detailed description of the Tarion Warranty, click here (pdf), click here (pdf) Adobe logo - pdf file

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