Radon gas reduction systems use a fan and duct work to draw the gas up and out of the soil before it enters living spaces. Radon is exhaust out above the roof line. (Photo by Adobe Stock Photos)

Radon gas reduction systems use a fan and duct work to draw the gas up and out of the soil before it enters living spaces. Radon is exhaust out above the roof line. (Photo by Adobe Stock Photos)

Houseworks: Reducing the radon gas hazard

Last month I answered a reader’s question about high radon levels in homes, and the response from that article made it clear more radon questions need to be answered.

That’s certainly the case when you realize that this naturally occurring colourless, odourless, tasteless, radioactive gas is the leading cause of lung cancer in Canadian non-smokers, and the second leading cause of lung cancer overall.

According to the government of Canada, radon is found in every home in the country to some extent.

What matters is airborne concentrations. Some homes in radon-prone regions can accumulate high enough indoor radon to cause avoidable lung cancers, and testing is the only way to know for sure if radon levels in your home are high enough to warrant remedial action.

Anything over 200 Becquerels per cubic meter (Bq/m3) is considered dangerous, and levels can be reduced to less than 100 Bq/m3 with the right ventilation equipment.

Even if your neighbour’s home has been tested and found safe without having a radon reduction system in place, that doesn’t mean that your home is safe, too.

Indoor radon concentrations can be affected by many things and can vary tremendously from one house to the next.

You can have your home professionally tested for radon or you can buy your own radon test equipment and monitor levels yourself.

Expect to pay $200 to $300 for decent radon kit, and use it repeatedly over time to get an accurate sense of what’s going on. Long-term testing for radon is more helpful than short-term readings which may not be representative of reality. Google “radon test kit Canada” and you’ll find many options.

There’s an entire industry devoted to bringing household radon down to safe levels, and standard practice involves two main things. First, a powerful fan is installed to draw air from the soil underneath the home (not the basement) and exhaust that radon-laden air safely outside at roof level. And second, all cracks, gaps and joints in and around the basement or concrete floor slab must be sealed. Without this sealing step, radon is still free to seep into your house because most of the suction of the radon fan is simply wasted drawing basement air outdoors, not sub-surface air from the soil. Not only is this less than ideal from a radon standpoint, but it massively increases heating bills as your radon fan simply shoots heated basement air outdoors. This is why basement crack sealing is vital for radon remediation. The problem is that most basement crack kits don’t work well enough because of one common problem.

Standard concrete crack repair technology involves injection of epoxy or polyurethane into the crack, and while this seals radon-promoting gaps at first, basements often shift and move slightly over time, re-opening the gaps as seasonal expansion and contraction of concrete takes its toll. That’s why an additional sealing layer over top of cracks makes so much sense. Carbon fibre application over sealed cracks in concrete virtually guarantees a permanent radon seal because it prevents structural movement, and the best and most widely available consumer-level carbon fibre system I’ve used so far is the DRICORE PRO concrete repair. Visit baileylineroad.com/how-to-fix-basement-cracks to watch a video tutorial I made to show a carbon fibre crack repair in action. I would never repair a basement crack by injection only because there’s a very good chance the crack will open again in time.

Radon gas is one of those significant but avoidable health hazards in life, and while it may or may not be a problem where you live, testing will let you know. Proper actions can make radon a non-issue.

Steve Maxwell is always leery of anything that’s radioactive. Visit him online at BaileyLineRoad.com for thousands of articles and videos about wise home ownership in Canada.

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