Radon, a naturally occurring radioactive gas found in soil, is the second leading cause of lung cancer after tobacco. Invisible, odorless, and dangerous when it accumulates in buildings, it represents a major public health issue in Canada. To address this, two key standards have been established:
- CAN/CGSB-149.11-2024 : Standard for new buildings.
- CAN/CGSB-149.12-2024 : Standard for existing buildings.
These two standards offer a comprehensive approach to reducing radon-related risks, covering both new construction and renovation. Here is a detailed guide to better understand and apply these standards.
Why is radon a problem?
Radon is produced by the decay of uranium present in the soil. When it accumulates in enclosed spaces such as homes, basements, or offices, it can reach dangerous levels. Health Canada recommends a maximum concentration of 200 Bq/m³ in homes. Above this threshold, measures must be taken to protect the health of the occupants.
The CAN/CGSB-149.11-2024 standard: For new buildings
Objective
This standard provides guidelines for integrating radon mitigation systems from the design and construction phase of new buildings, whether residential, commercial or industrial.
Main changes since the previous edition (2019)
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Expanded scope : The standard now applies to all types of new buildings , not just houses and small buildings.
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Mitigation levels :
- Level 1a : Conventional attenuation system with vertical output.
- Level 1b : Variant with side exit.
- Level 2 : Passive system with radon column.
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Removal of Level 3 : Active soil depressurization systems (now reserved for existing buildings) have been moved to the CAN/CGSB-149.12-2024 standard.
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Practical improvements :
- New illustrations to guide the installation.
- References updated for alignment with the National Building Code.
The CAN/CGSB-149.12-2024 standard: For existing buildings
Objective
This standard is designed for existing buildings, which are often more exposed to radon risks due to their initial design. It offers suitable solutions for measuring, assessing, and mitigating radon concentrations.
Key elements
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Initial assessment :
- Conducting long-term tests (90 days or more) to measure radon levels.
- Inspection to identify radon entry points (cracks, drains, cable passages, etc.).
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Mitigation methods :
- Active soil depressurization (Level 3) : Installation of a fan to prevent radon from entering the building.
- Crack sealing : Reduction of gas entry points.
- Improved ventilation : Increased air exchange.
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Maintenance and follow-up :
- Regular checks to ensure the effectiveness of installed systems.
- Training for occupants to recognize signs of failure.
Comparison of the two standards
| Characteristic | CAN/CGSB-149.11-2024 | CAN/CGSB-149.12-2024 |
|---|---|---|
| Building type | New buildings | Existing buildings |
| Mitigation systems | Passive and semi-passive (Levels 1 and 2) | Primarily active (Level 3) |
| Application time | During construction | Post-construction |
| Main objective | Prevention | Radon level reduction |
Why are these standards essential?
For the owners
- To ensure the safety and health of the occupants.
- Protecting property value while respecting modern standards.
For builders and renovators
- Facilitating compliance with rising consumer expectations and local regulations.
- To strengthen their position as experts in healthy and sustainable construction.
For public health
- Reducing exposure to radon, which is responsible for more than 3,200 lung cancer deaths each year in Canada.
How can these standards be implemented?
- Test for radon : Whether for a new or existing building, testing is the first step.
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Plan mitigation measures :
- Integrate passive or active systems during construction.
- Adapt the solutions for existing buildings according to the test results.
- Call on experts : Entrust the installation of the systems to qualified professionals to guarantee their effectiveness.
- Follow the recommendations of the standards : Use the best practices described in the standards for optimal compliance.
Conclusion: Let's protect our living and working spaces
The CAN/CGSB-149.11-2024 and CAN/CGSB-149.12-2024 standards offer a comprehensive solution for reducing radon risks in buildings, whether new or existing. By adopting these practices, we can build a healthier and safer future for everyone.
Need help implementing these standards? Contact us for personalized advice and solutions tailored to your needs. Together, let's reduce the risks associated with radon!