The pressure indicator shows the relative pressure. This removes a lot of the radon before it can migrate into the basement. The pipe contains a blower that sucks air from the gravel and vents it at roof level. There is a layer of gravel under your basement slab that has air filling the voids between the stones. The negative pressure systems are a pretty simple mechanism. However, you would likely need to mitigate it when you go to sell, so you might as well do what you can do cheaply now, and benefit from it yourself. If you don't spend time in your basement, the risk to your health is relatively low. So if you do a radon test and it comes back 4.2, the risk to your health isn't substantively different than if it came back 3.9. They may just have picked 10x the average outdoor level of 0.4, perhaps because inexpensive technology can typically keep a basement below that level, and that represents a minimal health risk compared to other things people are exposed to every day. Any amount carries some risk, and the government had to weigh risks and costs in order to pick a number at which they recommend doing something about it. The 4 pCi/L threshold isn't a magic number below which you're safe and above which you die it's somewhat arbitrary. But radon is heavier than air and basements usually aren't well-ventilated, so the basement is usually where you see the highest concentrations.īecause radon is heavy, it also tends to remain in your lungs when you breathe it, and being radioactive, it's a source of lung cancer. Your HVAC system will circulate some, and the exchange of outside air will get rid of a little. What seeps into your basement tends to accumulate. So virtually anywhere you live, the soil slowly releases minute amounts of radon. You don't have to live on top of a uranium deposit there are trace amounts of radioactive minerals in common rock, like granite. Radon is a byproduct of radioactive decay.
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