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Radon and what you should know!

What is Radon?

Radon is an odourless, colourless and tasteless gas that can accumulate in buildings, such as schools, offices and homes. More importantly, Radon is everywhere. It is the naturally occurring gas emitted from the breakdown of Uranium and is found in soil throughout all of Canada. According to Health Canada, Radon is the second leading cause of Lung Cancer in Canada.

This next point is very important. Health Canada identifies the increased lifetime risk from long term radon exposure, so there is no need to panic should a home have a high level of Radon. The Canadian guideline for radon in indoor air is 200 bq/m3. The Health Canada guidelines require that homes with levels over 600 bq/m3 are to be remediated within 12 months, while homes with levels between 200-600 need to be remediated within 24 months.

Radon levels are also very random. One homeowner might have a high level and their next door neighbour may have hardly any at all. Although soil testing can be done prior to construction, it cannot rule out the possibility that radon could be a problem after a home is built. The same way a bowl will hold more water than a sieve, Radon needs an enclosed space either in, or on, the soil in order to collect. It migrates to the lowest level of air pressure by natural air movement.

Because of this, in home levels tend to be higher in the winter when the surrounding soil has snow and frost effects and the gas migrates more naturally to the basement, being the lowest air pressure area within the surrounding soil.

What are we doing about Radon at Doug Tarry Homes?

At Doug Tarry Homes we have decided that we will be taking a proactive approach to controlling Radon in your new home.

At the time of writing this article, the Ontario Home Builders’ Association is conducting a survey of Radon levels in new homes across Ontario to better understand how new residential construction performs in the face of Radon gas. The knowledge gained by this survey will inform best practices to radon-resistant techniques in new residential construction.

Doug Tarry Homes has been participating in the OHBA Radon study since its inception and we are sharing information with other participating builders. During this time, we have learned a great deal about dealing with Radon. We’ve also had the opportunity to review the great videos that Jon Eakes has produced for the CHBA and to talk with industry experts. Once we understood what was involved and how to properly mitigate a new home under construction, we decided to act.

Effective January 1, 2016 Doug Tarry Homes is now installing a Radon mitigation system in every home we build in all markets that we serve. Under the basement slab will be a soil gas collection pipe rough-in. Above that, and directly below the basement slab, will be a soil gas protection layer to limit the entry of Radon into your home.

Should Radon be found to be present, the soil gas collection pipe can easily be made active very cost effectively using an inline fan to exhaust the sub soil gas from under the basement floor. This fan operates with very minimal ongoing cost to operate. We have worked to educate our local building officials in all the markets that we serve, to ensure they understand our details and can properly and effectively inspect our installations so that we have third party verification that we have installed our rough-ins properly.

Should you, as our customer, ask to have your home tested we will gladly test your home following nationally recognized guidelines and provide you with a copy of the lab report. As our customer, you will need to provide us with access to your home at the start of the winter season to place the test device and then again approximately 90 days later to remove it for lab analysis. While we do not anticipate finding high levels of Radon within our homes based upon the steps we are taking, if Radon is found, we will remediate your home by installing an active in line fan system, or other approved measure, so that we can ensure your home is made safe.

Our goal at Doug Tarry Homes is to continue our industry leadership by building the healthiest, safest, most energy efficient and affordable new homes possible. We are a home builder located in St. Thomas, Ontario, offering 6 different communities. You can count on the Doug Tarry difference in each and everyone of our homes.


We just wanted to let Mr. Tarry know that our experience with every single member of his team has been nothing but amazing.  We started looking for a new home 2 years ago and spoke to Amanda Joiner here in Strathroy at the open house.  We left her office that day 2 years ago and we knew DTH was a perfect company for us to trust with our future. Amanda made us feel  comfortable and she was very helpful in every step of the way.  We can’t say enough good things about her.  We bought one of your quick possession homes on Rushby St and could not be happier.  Jason took us through the house for our final inspection, and again he was amazing.  So friendly and informative.  Took his time going over everything and explaining it all and answering questions.  We also met Joe, I believe he is the site supervisor.  Joe, again so friendly and goes out of his way to make sure we where happy. Daryl and Laurie in your customer care centre are phenomenal.  They have been nothing short of amazing.  I’m sure you probably realize that you have an amazing team working for you but sometimes when you hear it from an outsider it means a little more.  So we applaud you Mr. Tarry for assembling such a great group of people to represent DTH.  They are doing an amazing job for you and treating all of your customers like they are family and we appreciate it.  Thank you to all at DTH for making our experience nothing but AMAZING.

Jason Banks

Our expectations of a new is exceeded by Doug Tarry (design-quality construction and workmanship) and an exceptional support staff

Happy Home Owner

We loved the quality and building experience that we had with Doug Tarry Homes so much that we did it twice! From the quality of the construction, to the personalized help in making selections, we couldn’t have asked for more. Even after we took possession the follow up and communication to ensure that we were happy with our new home was thorough. We would definitely build with Doug Tarry homes again!

Ryan and Tara McDonald

Thank you Doug Tarry Homes for our wonderful home. Throughout the planning and building stages we found everyone we dealt with to be extremely knowledgeable and helpful. Any concerns or issues were promptly dealt with in a professional manner. The quality of our home, both inside and outside, is exceptional. (Even after one year we haven’t found a nail pop!) You go the extra mile and it shows. We would not hesitate to recommend Doug Tarry Homes to anyone.

Heather and Gary Vedova

This was our first time building a home. Doug Tarry Ltd made the experience enjoyable and so easy. Each member of the company was very approachable and easy to talk to. They took us step-by-step through the process of building a home and making our dreams come true. Thank you to the Doug Tarry group.

Jinder and Amy Virdee

Patty and I have purchased 4-new homes over the course of our evolving status; from raising two children to being empty-nesters. Without a doubt, Doug Tarry Homes has been ‘far and a way’ the most professional builder that we have had the pleasure to deal with. We’ve been very impressed with the quality and the attention to details with our home. The most obvious difference has been the professionalism of the Doug Tarry personnel. Their help and assistance through the various stages of the construction to the final delivery and accommodation with our move-in requirements was outstanding. The differences with Doug Tarry Homes continued throughout the immediate 12-month period after our move-in date by completing the scheduled follow-up items on a timely basis. I only wish that the customer satisfaction formula used by Doug Tarry Homes was utilized by other business enterprises.

Don and Pat Calder

We were into our new house yesterday! What a wonderful surprise to see the welcome gift basket!! We have been so impressed all along with Doug Tarry homes, from the people (you!), the quality of the house, the design, the materials, the basement, the air and temperature of the house, everything!! Liam used to build houses and he has been blown away by everything we’ve seen and experienced with Doug Tarry homes. He’s not easily impressed either and has a keen critical eye and he is over the top happy with everything, as am I. So a big thank you Michele, for everything. You’ve been so patient with us right from the beginning, when we first showed up over a year ago when we first started looking at the area in St Thomas.

Trish and Liam

My husband and I are retired seniors with very specific needs in mind for our retirement home. We found these and more in a Doug Tarry home in St. Thomas. From a well-designed floor plan to an exceptionally well-built house, we couldn’t be more pleased with our decision. Before, during and after the construction phase, the Tarry staff were extremely efficient and always ready to help with advice and recommendations. We’re very happy and comfortable in our new house. Well done Doug Tarry Homes!

Don & Kathy MacRae

I’m now living in my second Doug Tarry built home. When I bought my first home, I wasn’t thinking about resale, but being able to advertise a “Doug Tarry built home” really gave me a selling advantage.

This current home is actually my fifth new home I’ve lived in. I wouldn’t hesitate to build again with Doug Tarry. The standards for the home – insulation, framing, kitchen, plumbing, etc – are very high compared with other builders. This allowed me to put some additional funds into some extras, such as recessed lighting and hardwood flooring. The Doug Tarry group work very much as a team, from the home plan design, interior selections to sod. You are very much supported in the entire building process, and the follow-up for any issues after you move in is excellent.

Joan Rymal

Great experience through every stage of the process. Very knowledgeable and organized. Confident we are receiving a very high-quality home. Thanks DT Homes.

Happy Doug Tarry Home Owner

Confidence in a Doug Tarry home knowing him, and his commitment-I don’t have to do much, he’s thought of it all!!

Another Happy Home Owner

I love my new semi home!  The transition from selling my family home to 3 Benjamin has been very pleasant and I owe that to the people I have come in contact with, especially Michele, Jason, Daryl, Lori and Elaine.  Your CoConstruct programme is very helpful and efficient.  Anything that needed to be addressed has had followup. 

Michele Fowler

We chose Doug Tarry Limited as the builder for our custom home because of their reputation for quality workmanship. Having our new home built at the same location as our current home we were able to witness first-hand the skill, quality, and pride of workmanship that each tradesman working on our home put into their work. We have had so many positive comments on the design and layout of our home, as well as the quality of the products used within the complete design. We cannot be happier with the finished product, and we highly recommend Doug Tarry Limited to anyone thinking of building a home.

Lisa and David Tenhor

Overall the home purchase went exceptionally well. We are pleased with the home and do not have any complaints. If there were any small things that we were unhappy with the staff at Doug Tarry (both office and tradesfolks) were always polite, quick at getting back to us and very knowledgeable.

Gord and Karen Ryan

As a family purchasing a new home, quality, comfort, energy efficiency & price were important to us. Doug Tarry Ltd. met and exceeded these needs.

Wayne, Angela DeVries & family

I knew our new house was energy efficient but not that much! At the time of construction, we decided to insulate the basement floor instead of me getting a cold storage cellar. We have a very efficient furnace with an ERV unit. It wasn’t that cold in December, but even with all the kids home for 2-3 weeks over Christmas, our gas bill was just under $40! Love it.

Shout out to Doug Tarry Homes for being a leader in the new home industry for wonderful construction and environmental consciousness.

Satisfied Customer

After purchasing many new builders homes, the Doug Tarry experience was by far the most enjoyable. With the team’s recommendations, ideas and perfectionism, we ended up with a home that far surpasses any of our expectations. When we woke up after the first night in our new home, we both looked at each other and said “this feels like home”. We have never had that feeling after the first night in any of our previous homes. After 6 months we still at times say to each other ” Man I love this house”. Great work Doug and crew.

Borot & Petra Jansa

We have finally moved in over the weekend and are still settling in. I wanted to take this opportunity to say thank you to Doug Tarry Homes and especially you for helping us out and guiding us throughout the entire process.

We greatly appreciate all your sincere efforts in helping us build our dream home. On behalf of our family, thank you once again and I look forward to seeing you around!


I know that corners will not be cut, and the home will be built to last a lifetime

A Happy Home Owner

Our experience dealing with Doug Tarry Homes, from the moment we were greeted at the model home, to our closing date when we picked up our keys was a positive one! The decision to build with Tarry’s was easy because of their long standing reputation for quality, and a commitment to the environment. What was a bonus was the service orientation of all their staff. Questions and concerns were addressed quickly, the designer thoughtfully guided us through all our decorating selections, and all staff were courteous, friendly and genuinely cared. Without hesitation we would recommend building with DTL!

Rebecca Parkes and Gary Hodge

This home is everything we dreamed it would be. Fits our family’s needs perfectly.

Satisfied Doug Tarry Home Owner