Best Time to Test for Radon? First Snowfall. Here’s Why.

Each year, more than 3,000 Canadians die from lung cancer caused by radon—the second most dangerous cause of lung cancer after smoking.

Radon comes from uranium, a natural element found in the ground. When uranium breaks down, a radioactive gas is released, called radon. You can’t see it, smell it or taste it, but it’s there and it has always been there.

If radon is under your house, the gas might be seeping through to your home and harming your family. Over the tiny radioactive particles could get into your family’s lungs, and when they release energy, these particles damage lung cells.

Most homes have some level of radon in them, but Health Canada estimates that 6.9 per cent of Canadians are living in homes with radon levels above the current Canadian acceptable limit of 200 becquerels per cubic metre (Bq/m3).

The best time to test is now – in winter.


Actually, waiting until the first snowfall is even better. Since radon seeps through cracks and openings in your home’s foundation, windows, pipes floor drains or by way of the sump pump, winter is the most likely time it will accumulate in your home.

As the area surrounding your house becomes well sealed in a blanket of snow and ice, the area under your home remains thawed, and radon gas looks for the path with the least resistance to emit from the ground.

Radon finds its way into homes through a variety of access points:

  • cracks in the basement
  • cracks in floors or walls
  • water supply pipes
  • groundwater and well water
  • openings around electrical access points
  • basement floor drains.

Testing for Radon

Radon testing is not part of a standard home inspection; therefore, your home may not have been tested when you bought it. Mose Home Inspection Services will do a radon test upon request, and sometimes, will suggest one.

Cost of Testing for Radon

While there are tests available at your local hardware store that you can perform on your own, and send away to a lab for testing, Mose Home Inspection services has special equipment that tests radon over time, taking a reading on an hourly basis in order to provide a profile of the testing period, because there is bound to be fluctuation over the testing time. These results tend to give the homeowner an accurate reading.

Radon Mitigation

Radon is common in Canada. If the home you bought or are about to buy has radon, you can take action. There are many ways to lower the radon levels in a home. Sealing cracks, gaps and holes in the basement floor are a good start. Adding a ventilation system that draws air out from under the basement and vents it to the exterior of the home is one of the most effective ways to deal with radon.

Finding a contractor to deal with radon

According to recommendations by the Radiation Protection Bureau, Health Canada and the Canada Mortgage and Housing Corporation, many of the techniques used to reduce radon on a long-term basis require the services of a professional contractor, as radon is a relatively new issue. There are not many contractors in most regions of Canada with experience in radon reduction methods. Make sure to inquire whether the contractor has received any special training on radon and radon reduction techniques.

For more information on radon, see:

You can also call Mose Home Inspection Services, and request to talk to an inspector about radon testing.

Mose Home Inspection Services
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Lay Chan Wee
Lay Chan Wee
01:19 31 Aug 21
I was impressed with the service provided by Rui Su. He was organized, explained in detail area that I am not familiar... with. He provided a good report. I will recommend him if you need home more
Mary Jane Caro
Mary Jane Caro
14:25 27 Aug 21
I am always pleased to recommend Carol Mose from Mose Home Inspection Services to my clients who have had offers... accepted on residential real estate properties. She is knowledgeable, thorough, provides clear explanations, and delivers comprehensive more
Massimo Pannunzio
Massimo Pannunzio
22:05 25 Aug 21
Michael has got to be on of the best home inspectors in all of Quebec. It was amazing working with him and he had my... best interest at heart when making a life changing decision. He made sure I had all the answers and made it easy to work with him. I will be using Mose inspection for any moment that I need an inspection done that's for sure!read more
Amanda Lee
Amanda Lee
19:14 16 Jun 21
Amazing experience with Carol Mose who helped me with a pre-purchase inspection! She was very approachable and... observant, and informed me of all her first impressions on-site. This gave me greater understanding of any conditions as I was able to ask any quick questions on the spot. Her reports are the most thorough that I've seen and include diagrams to help explain what any physical signs mean and potential consequences. Could not have asked for a better inspector!read more
Maeghan Banks
Maeghan Banks
15:38 14 Jun 21
Carol was wonderful to work with for our pre-purchase inspection. She was professional, thorough and communicative,... taking the time to explain her findings as we went through the house. After the inspection, we felt we had clear knowledge of the condition of the house (both pros and cons), allowing us to move forward with the purchase with confidence. Highly recommend!read more
Ryan Chalupovitsch
Ryan Chalupovitsch
13:43 01 Jun 21
Carol Mose is the best home inspector in the business. Approachable and extremely knowledgeable. She did an... inspection for me and really took the time to explain her findings and help me understand the home I was looking to purchase. Cannot recommend her enough. Don’t more
Elisabeth Faure
Elisabeth Faure
21:16 29 Apr 21
This is the second time I have used MOSE, and they are always really amazing. Very nice, very professional. they came... to have a look at my roof and let me know if we were due for a repair - I was very satisfied with everything and would recommend them to anybody!read more
Hannah S
Hannah S
22:05 16 Apr 21
I had a great experience with Mose home inspection. My husband and I are first time homebuyers and so had a ton of... questions about the process. Everyone we talked with was really informative and helpful. Michael was our inspector and was phenomenal. The inspection was very thorough and he explained everything in detail with realistic next steps for us to take. We came out of the inspection feeling really informed. Plus, he is just an absolute delight! He had very contagious enthusiasm and made the inspection a really positive experience. Would highly recommend!read more
Gabriel Lukuc
Gabriel Lukuc
03:05 16 Apr 21
Michael was amazing. He took the time to explain to us what’s really important and the reasoning behind it. We’re not... very handy nor savvy when it comes to home construction so we really appreciate him taking the time to explain to us all aspects of the inspection. Also, Michael was friendly, professional and timely; he provided the report over a holiday and a more
Stephanie Ballard
Stephanie Ballard
14:24 19 Mar 21
MOSE is the best in the business. Once again we were happy with their inspection services - they are professional,... friendly and knowledgeable. Would not hesitate to recommend to friends and family (and have)!read more
Rodrigo Morales
Rodrigo Morales
18:27 10 Sep 20
Home inspection
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