Radon Removal Effectiveness: Real Results Before and After Mitigation in Canada

Radon is a naturally occurring radioactive gas that poses a significant health risk to many Canadian households. In this blog, we examine real-world radon levels before and after mitigation in Canadian homes, explore the effectiveness of mitigation systems, and explain the typical reductions homeowners can expect. The blog seeks to present a simple process and demonstrate that acting against Radon is highly effective. 

The Invisible Threat: Understanding Radon in Canada

Radon can enter homes through floor drains, sump pits, construction joints, and other openings in the building envelope. Because radon is invisible and odorless, testing is the only way to determine whether it is present at elevated levels. The only way to determine your home's radon level is through testing. If elevated levels are detected, mitigation may be necessary to reduce the risk, and then concentrate on Radon mitigation.

Canada's Unique Radon Landscape

Radon levels vary across Canada due to differences in geology, soil composition, and ground-level uranium concentrations. Areas with higher concentrations of uranium in the soil and bedrock often experience elevated radon levels. Building design, construction methods, and foundation conditions can also influence indoor radon levels. Public awareness initiatives, such as National Radon Action Month and educational campaigns, help Canadians understand the risks of radon exposure, encourage testing, and prompt them to take preventive measures to eliminate or reduce radon levels.

The Science Behind Radon Removal: How Mitigation Systems Work

In essence, effective Radon mitigation involves blocking Radon from entering the house and, if it does, reducing it to harmless levels. Sub-slab depressurization (SSD) is a common and highly effective method used for this purpose in most homes. While the process requires technical expertise, it is a proven and highly effective mitigation method.

Sub-Slab Depressurization (SSD) Explained

Sub-slab depressurization: a skilled individual installs a perforated pipe (or a network of pipes) just below the concrete slab or within the crawl space. The pipe is attached to an indoor booster that continuously draws off soil vapours containing Radon below the structure. Afterward, it expels the gas safely outside, usually at a considerable distance from cross air currents and, most importantly, reverses Radon's path out of the house. This process effectively prevents radon from entering the living space.

Baseline Estimation: Radon Levels Before Mitigation 

It is imperative to take precise measurements of Radon levels before commencing any work. A short-term test can provide a preliminary indication of radon levels, but Health Canada recommends long-term testing for at least 91 days to obtain the most accurate annual average. Health Canada recommends long-term testing for at least 91 days because it provides the most accurate estimate of annual radon exposure.

Confirmation of Effectiveness: Post-Mitigation Testing

After installation and allowing the mitigation system to settle (usually for a couple of days up to one week), another important step is testing. Just like before, you should use the same method you used for your initial test – preferably another long-term one – to ensure a fair comparison. This post-mitigation test serves several purposes, such as:

1. Confirms Reduction:

It confirms that the Radon level after mitigation is below 200 Bq/m³ – the standard set by Health Canada.

2. Quantifies Improvement:

It provides an objective measure of how much better we are today because we were able to lower those Radon mitigation numbers again.

3. Foundation Integrity:

Foundation size, condition, and the number of potential radon entry points can affect mitigation performance. Proper sealing of accessible openings helps improve system efficiency. Proper sealing of accessible openings helps improve system efficiency and supports the pressure field created by the mitigation system.

4. System Design and Installation Quality: 

The most crucial controllable factor is the quality of system design and installation. The proficiency of a certified professional comes into play in selecting the appropriate fan (with proper airflow and static pressure), creating an effective pipe network, and sealing all possible Radon entry points with attention to detail – this is what matters. The quality of system design and installation is often the most important controllable factor. Certified professionals can select the appropriate fan, design an effective pipe network, and seal key entry points to maximize radon reduction.

Frequently Asked Questions

How effective are radon mitigation systems? Can they eliminate radon?

Professionally installed sub-slab depressurization (SSD) systems are highly effective at reducing radon levels. They can often reduce Radon in the ambient environment by 80%-95%; however, complete elimination is generally not necessary, as the goal is to reduce radon levels below Health Canada's guideline of 200 Bq/m³. This demonstrates impressive Radon removal effectiveness.

Why might radon levels remain above recommended levels after mitigation?

A Radon mitigation system reduces Radon levels by 80%- 95% when properly designed and professionally installed. For instance, after mitigation, a house with an initial test result of 600 Bq/m³ may record levels between 30 Bq/m³ and 120 Bq/m³. These systems convert hazardous spaces into safe ones by reducing a great portion of the risk associated with Radon. The actual reduction varies greatly depending on factors such as the type of soil and the nature of the installation itself.

Is continuous operation necessary for the Radon mitigation system?

The fan should run continuously to keep Radon gas in check. It is known that these contraptions operate by maintaining a certain amount of air pressure beneath your floor; this air pressure prevents Radon from entering your house. If the fan is turned off, radon levels can rise again because the pressure difference that prevents soil gases from entering the home is no longer maintained.

Conlcusion

In summary, a study on Radon mitigation in Canada provides an interesting account of the science, technology, and preventive measures involved. The fact remains that professionally installed mitigation systems, especially those involving depressurization below concrete slabs, continue to operate efficiently, reducing Radon levels in Canadian houses. Preventing lung cancer through reduced Radon levels across many Canadian homes is the real meaning behind such high levels of Radon removal efficiency, not just some numbers designed to comply with certain standards and regulations and nothing more at all.