Repairing a home or workplace with a high radon level is usually referred to as “mitigating”.
Our simple guarantee is; “If we fail to reduce the Radon in your home or business to below the Canadian ‘action level’ we will refund all our mitigation fees.”
High Radon Test?
If you have a radon test that is higher than the ‘action levels’ Health Canada recommends, or if you want to lower your family’s or employee’s exposure to radon gas we will proceed as follows:
Mr. Radon® will analyze your home as to how it was built, type of foundation wall construction, basement floor finishes, presence of sump pit, high water table, topography, size, age of building, and what level of Radon Gas your test showed. This information or as much of it as is known, is usually taken over the phone. It is also important for us to know what type of test you conducted including device type, length, and protocol followed.
Mr. Radon® will then book an appointment to complete a soil permeability or connectivity test. This will show us the permeability of the gravel bed and/or soil under the concrete and find out if there are any hidden footings which will affect connectivity. This will also provide us with key information so that we can recommend the correct system for your home.
Communication (Connectivity)/Pressure Field Testing
A 4-5 inch hole is drilled through the basement slab (usually in the furnace room). Gravel and sub soils are removed to create a collection pit. In opposite corners of the basement, pencil wide holes are drilled and a vacuum is attached to the larger hole. (This will be the main point of extraction.) The pressure between the point of extraction and the small holes is recorded. The purpose of this is to gauge the volume of air that can be moved from one area to another. Thus the word connectivity. If there is no connectivity then a second point of extraction may be required. This may occur with the lack of gravel, extremely solid sub soil or obstacles like footings. This test will let us customize the radon fan to fit the house’s individual requirements.
At this time we can finalize the design of the SSD system and offer the final pricing and contract. For the majority of systems we will be able to complete the SSD system on the day of the communication testing.
If a report is required of the design and parameters please add $200.
* Travel charges may apply.
Sub Slab Depressurization System (SSDS)
Simply put…to reduce the amount of radon coming into your home involves the capturing of gas underneath your basement (or slab on grade) slab and redirecting it outside where it dissipates very quickly. It also could involve the sealing of sump pits, the installation of membrane and several other tasks as the situation requires.
Should your homes basement or crawl space have a dirt or rock surface rather than a concrete slab there are several additional steps to be taken including installing a radon membrane before a depressurization system can be installed. If this is the case, the $800.00 + hst is the site consultation fee. Although labour intensive, Mr. Radon® has been very successful with these more complicated mitigations.
An uncomplicated side wall venting mitigation system averages $1,850.00. This includes both a short and long term post mitigation test. The post mitigation tests will prove the system is now protecting your family from Radon Gas. Although we are happy to send you an estimate after our extensive questionnaire, we will be happy to provide you with a firm price to mitigate your home after we have completed the connectivity testing.
Mr. Radon® always strongly recommends the purchase of a home radon alarm. This can be purchased from Mr. Radon® for $185.
Now here’s the silver lining…..
Active soil depressurization has several other benefits that make your house a nicer place to live. The basement is drier, and most people comment within a few weeks that it smells different. The musty basement smell is gone. Active soil depressurization also removes methane gases and pesticides that may have been entering your home in the same fashion as Radon Gas.
Radon reduction can occur very quickly within 24 hours of a mitigation system being installed. Note the following graph:
Of course one cannot always assume that these kinds of reductions will occur. Reductions need to be verified with short-term testing, conducted in a similar manner as the pre-mitigation testing.
Post-mitigation testing should start no sooner than 24-hours nor later than 30 days after the installation. This should be a short-term test to quickly determine the efficiency of the system. Once the levels have been confirmed, a test should be conducted at least once every two-years thereafter or whenever building renovations have been undertaken or major changes to the immediate area have occurred.