I have not been very productive as I have been worrying about radon in the basement.
Just before we left on our Christmas trip, I ordered an Airthings View Radon device, which measures radon, humidity and temperature. I installed it in the basement the evening before our trip.
Just for reference, the radon levels (pico curies/Liter or pCi/L) that the EPA
- Less than 2.7 - Good, no action needed
- Between 2.7 and 4.0 - Fair, but if in this range for greater than 3months, may need mitigation
- Greater than 4.0 needs remediation
What surprised me was the variation of radon based on a bunch of factors. It could change within a couple of hours. I have shown the last week and the last month graphs. Green - Good , Orange is 2.7-4.0 pCi/L, Red > 4.0 pCi/L.
A week ago, the radon levels started increasing steadily until it peaked around 5 pCi/L. I moved the monitor to the 1st floor of the house, where we spend most of our time and it dropped to 2.0 pCi/L in about 24 hours. You can see that in the steep dropoff at the very end. So, radon is not an issue in the rest of the house. If I can reduce it in the basement, it will probably decrease in the rest of the house.
I have been thinking of these issues and this is what I have checked/thought of
- The radon pump is working because the manometer shows 1.2 inches of water
- The sump pump cover is air tight. Verified using incense sticks as a smoke puffer.
- I have caulked the cove gap around the basement, but have not done about 12 feet behind the furnace. This could possibly be an easy entry for radon.
I do need to caulk the cove gap behind the furnace and will do that this morning.
So, I am asking my brain trust, do you have any suggestions on what to do?