Many newer homes are built with a passive radon pipe already in place. It runs from under the slab up through the house and out the roof, but without a fan it relies on natural airflow, which is often not enough. We connect York homeowners with a local contractor who can activate that pipe by adding a fan.
What a Passive System Is
A passive system is a pipe that builders install during construction. It usually starts in the gravel layer under the basement slab, runs up through an interior wall, and exits through the roof. The idea is that warm air rising in the pipe will draw some soil gas out from under the house.
Passive pipes help a little, but they depend on temperature and weather. On many days the natural draft is too weak to keep radon low. That is why a test in a new home can still come back high even though a pipe is already there.
You can often spot a passive pipe in the basement or utility room. It is usually labeled as a radon pipe and may have a cap or a section of exposed pipe in the attic.
How Activation Works
Activation means adding a fan to the existing pipe so it pulls soil gas out continuously. In most homes, the best place for the fan is in the attic, where the pipe passes through on its way to the roof. The contractor cuts into the pipe, installs the fan with rubber couplings, and connects power.
A gauge is added low on the pipe so you can see that the fan is creating suction. The contractor also checks the pipe for open joints and looks at the slab for openings such as a sump or large gaps that should be sealed.
Because the pipe is already in place, activation is often simpler than installing a new system from scratch. The contractor will still confirm that the pipe connects to the gravel layer as expected before recommending it.
Testing Before and After
If you have not tested yet, test first. A short-term kit in the basement or lowest lived in level will tell you whether activation is needed. If the result is at or above 4 pCi/L, or close to it, activation is worth discussing.
After the fan is added, give the system at least a full day to run, then retest with the house closed up. The result should drop well below where it started. If it does not, the contractor can check for leaks or look at whether the pipe needs another suction point.
Keep your test results with your home records. If you ever sell, a buyer will likely ask about radon, and showing an active system with a good retest makes that conversation easier.
Put Your Passive Pipe to Work
If your newer York County home has a passive radon pipe and a high test result, activation is often the most direct fix. Every home is a little different, and a short visit is the fastest way to learn what yours needs. A careful look at the house is always the best starting point. Knowing the steps ahead of time takes much of the stress out of the process. Call us and we will connect you with a local contractor who can check the pipe, add the fan, and guide your retest.
Frequently Asked Questions
Can a passive radon system be activated in a new York home?
Yes, in most cases. If the passive pipe connects to the gravel under the slab and runs through the attic, a fan can be added in the attic to activate it. The contractor checks the pipe and the slab first to make sure activation will work as expected.
What does passive-to-active conversion usually involve?
The contractor cuts the existing pipe in the attic, installs a fan with rubber couplings, connects power, and adds a gauge lower on the pipe. They also check for open joints and seal key slab openings. The written quote should list each step and the retest plan.
When should we retest after activating the system?
Let the fan run for at least a full day, then run a short-term test in the lowest lived in level with windows and doors closed. Many homeowners test within the first month. If the result is not where it should be, the contractor can check for leaks or other adjustments.