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  #11  
Old 2012-02-17, 03:11 PM
kanataDad kanataDad is offline
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This was a great imformative meeting and hopefully other areas in Ottawa or Ontario will hold such meetings to educate home owners.

The City of Ottawa are looking at this seriously, and so are builders in Kanata North who are voluntarily Radon proofing future construction (ahead of building code changes coming soon).

90 day test is a minimum requirement to get accurate results (preferable in the colder months of the year when homes are closed).

For construction under 2 years you can approach your builder and Tarion to see if they are willing to do the Radon mitigation. This is good news for those purchasing new homes or have homes under 2 years old in Morgans Grant, Brookside, Kanata Estates and Richardson Side Ridge. Hopefully builders in other areas in Ottawa and Ontario will follow.

But testing is key (specifically 90 day testing) - you won't know if you have an issue until you test. If your neighbor tested and has results, there is no gurantee that their results will be close to yours.

There is a simple proven solution for mitigating Radon - sub-slab depressurization.

Lots of people came, lots of people had very good questions. Very informative.
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  #12  
Old 2012-02-17, 04:11 PM
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did someone explain what the mitigation could/would be post possession?
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  #13  
Old 2012-02-17, 04:43 PM
200Charlie 200Charlie is offline
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Thanks for the report.
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  #14  
Old 2012-02-18, 12:32 AM
kanataDad kanataDad is offline
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Yes - Kelly Bush from Health Canada said you can start first with ensuring all cracks are sealed in your basement floor and walls. She also mentioned about ventilating the home as well.

But these will probably only make a slight difference.

Biggest bang for the buck to really reduce levels would be to install a sub-slab depressurization system.

Read the details at this link ...
http://allthingsradon.com/2010/01/su...ssurization-2/

You can contact Health Canada for a list of installers in your area.

http://www.hc-sc.gc.ca/ahc-asc/media.../radon-eng.php
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  #15  
Old 2012-04-27, 10:12 AM
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Quote:
Originally Posted by kanataDad View Post

The City of Ottawa are looking at this seriously, and so are builders in Kanata North who are voluntarily Radon proofing future construction (ahead of building code changes coming soon).
Not Urbandale. The sales rep we spoke with in Kanata Lakes had no idea what was going on about Radon. We even told her that Richcraft was testing and installing vents.

She continued to play (or be) ignorant but the possibility is that with the R-2000 rating it is less of an issue but I don't know.
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  #16  
Old 2012-08-22, 10:37 AM
kanataDad kanataDad is offline
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R-2000 or energy star does not lessen that chances of Radon. It's like saying energy star ensures a structurally sound building structure. One has nothing to do with the other.

Talking to one Radon expert, he said it is now an even bigger problem for the newer air tight houses as opposed to older air leaky ones since Radon accumulates inside the home at higher levels in tighter homes. Also if any one tells you that HRV will get rid of the radon issue ... this is not entirely true. It reduces levels, but not significantly enough as a sub-slab depressurization system.

There is no guarantee that if one or more houses have high levels of radon that your home will have high levels too. Also the reverse it true - if several homes have tested negative there is no guarantee that yours will also test negative.

That's why it's best to test after you move in, and for 3 months period that you don't have your windows/doors open for too long during the day, preferably test in the late fall to early spring months.

If you have a 3 month radon test result showing over 200 bq/m3 just send the results to your builder and to Tarion and to building code department in City of Ottawa.

Last edited by kanataDad; 2012-08-22 at 11:11 AM.
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  #17  
Old 2012-08-22, 10:40 AM
kanataDad kanataDad is offline
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http://www.yourottawaregion.com/opin...g-on-radon-gas

"The province is considering changes to the Ontario Building Code that would help prevent radon gas from entering new homes from the soil and rocks that your home is built upon. Some Kanata builders are voluntarily making those changes in construction now, so that the possibility of radon entering the house is reduced. For existing homes, information will be provided on how to test and what remedial measures can be undertaken."


BTW - the "builders in Kanata North who are voluntarily Radon proofing future construction (ahead of building code changes coming soon)" statement was made by Kanata North Councillor at a public meeting in Kanata North early this year (Feb 2012).
Perhaps that's what the builders told the City or Councillor when many home residents started contacting the City after measurements showed high levels.
Note I know of one Urbandale home owner that has successfully managed to get re-imbursed (by Urbandale) for radon mitigation costs after he got the city building code inspector involved. And I know of another who complain and got his basement caulked to reduce levels. So they are very much aware of it.

Last edited by kanataDad; 2012-08-22 at 11:00 AM.
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  #18  
Old 2012-08-22, 03:18 PM
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We are building in Blackstone (which is Kanata south), but I emailed my builder (Cardel) to see if they are doing anything for their Kanata north homes.

I got a response from them saying that Cardel IS one of the builders that have volunteered to take measures in their North Kanata sites (Richardson Ridge).

All houses will be implementing soil gas control measures. Their soil control includes a polyethylene membrane under the basement floor slab, sealing of the perimeter of the basement floor slab and penetrations through the floor slab. They are also installing a soil gas vent pipe that can be used to draw air from under the floor slab in the future if the client later determines that soil gases are a concern in the home. This pipe includes a perforated section that will run under the basement floor from the mechanical area to the center of the basement floor. It will protrude through the basement floor in the mechanical area and will be capped for future use. If the client later determines that soil gasses are a concern they will be able to connect a fan to this pipe and exhaust the air to the exterior through the rim board above the foundation. The fan and associated piping through the rim board would have to be installed by the client at that time.
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  #19  
Old 2012-08-23, 02:25 PM
craniumcrusher craniumcrusher is offline
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my understanding after talking to city inspector is that all houses that have building permits issued in 2012 in the South March Highlands (not just kanata lakes) have to install sub slab depressurization system as outlined by kanatadad below. the builders are not "volunteering" to do it, they are forced to do it and have to have inspected as well..so if someone has been reimbursed by their builder it is because the homeowner was able to prove that the radon levels exceeded 200 bq/m3...keep in mind that Health Canada will only recognize the results of 90 day test protocol and the test should be done during the heating season when windows are closed to be as accurate as possible...dont waste your money on the test kits from home depot unless they are the 90 day variety...if the readings are high then the builder has to mitigate the problem by installing a passive ventilation system or a fan vent system
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  #20  
Old 2012-08-23, 02:33 PM
craniumcrusher craniumcrusher is offline
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as a footnote to my comment above, a subfloor depressurization system is an option not necessarily mandatory.. builders may also install a soil gas barrier which is basically poly below slab and all perimeter sufaces and penetrations through floor have to be sealed as well...a friend of mine has just started his build with Urbandale and they apparently do the soil gas barrier and a soil gas vent rough in for future ventilation if required...my thought is that all permits issued for this area should require this as a minimum
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