Before opening your radon test kit, be sure that your doors and windows have been closed for at least 12 hours. If you have a radon mitigation system, it should be running at least 24 hours before starting a radon test.
Where to Test for Radon
Now choose the areas you want to test.
For a real estate transaction, test the lowest livable level of the home. For homeowners test the lowest lived-in level of your home.
If your home has multiple foundations, you should test each of those foundation types. For example, a four-level split will require a test in the basement and a test in the area at ground level.
Have an addition? Test the original part of the house and the addition.
Do you have a basement and a crawlspace? If yes, then test the basement and the room above the crawlspace.
Is your foundation over 2000 square feet? If so, perform two radon tests.
Which Room to Test
Test in rooms you use the most often like a bedroom, living room or an office. Avoid testing in kitchens, bathrooms, crawlspaces laundry rooms and mechanical rooms because humidity may skew your test results.
Now that you’ve picked the room you want to test, go ahead and open your test kit. Be sure to carefully follow the instructions. Fill out the start time and date along with any other requested information. Remember that someone at the lab must be able to read your writing.
Now hang, place, or tape your test kit in your normal breathing zone between 2 and 6 feet from the floor. It should be at least 3-feet from exterior doors and windows, 1-foot from exterior walls, 4-inches from other objects, avoid direct sunlight and not placed in a draft or next to an air vent.
How Long to Test for Radon
Most short-term test kits are designed to be exposed for 2-7 days. Long-term radon tests are typically exposed for 3 to 12 months.
If you’re conducting a short-term radon test, then be sure to keep your doors and windows closed during the test period so you get accurate results. You can enter and exit the house just close the door behind you. Set window AC units to recirculate if you have them. Set your furnace fan to auto.
You can use your house normally if you’re performing a long-term radon measurement.
Ending Your Radon Test
Be sure to carefully seal the radon test kit shut after the test period. Record the stop time and date and answer any remaining questions.
Mail it Fast!
Time is of the essence here. Most test kit manufacturers recommend expedited shipping. The half-life of radon is 3.8 days. If the test gets to the lab 4 days after you mail it, that means that there’s only half the radon left in the kit to count.
Getting Your Results
Most labs mail or email your radon results back to you once your radon test kit has been analyzed.
Check out our blog to discover what your radon levels mean and when you should take corrective action to lower your radon exposure.