An unsealed sump pit is one of the biggest radon entry points in a basement. The open hole acts as a direct pipeline from the soil beneath your foundation into your living space. We install custom-fitted, airtight sump pit covers that seal this pathway while keeping your sump pump fully operational.
Why Open Sump Pits Are a Radon Problem
Your sump pit sits below the foundation slab, directly in contact with the soil that produces radon gas. When the pit is open or covered with a loose-fitting lid, radon gas rises freely through the opening and into your basement. In homes along Ravenna Road and the older subdivisions near Twinsburg City Park, we routinely see radon levels drop significantly after sump pit sealing alone.
Even homes with a radon mitigation system can underperform if the sump pit is not properly sealed. An open pit creates a pressure bypass that reduces the suction your system can maintain beneath the slab, making the entire system less effective.
How We Seal Your Sump Pit
We fabricate airtight sump pit covers from heavy-gauge polycarbonate or HDPE plastic, custom-cut to fit your pit dimensions. The cover sits on a foam gasket and is mechanically fastened to the floor or pit rim to create an airtight seal.
Every cover includes sealed pass-throughs for the sump pump discharge pipe, power cord, and float switch wiring. We also install a sealed access port so you or a plumber can service the pump without breaking the radon seal. If your home has a radon mitigation system, we can integrate a suction point directly through the sump pit cover for maximum soil gas collection.
Sump Pit Sealing + Radon Mitigation
In many Twinsburg homes, the sump pit is the ideal location for a radon system suction point. The pit already penetrates below the slab and sits in contact with the aggregate layer where radon gas collects. By sealing the pit and pulling suction through it, we get excellent radon reduction without drilling additional holes in your basement floor.
This approach is especially effective in homes throughout Hudson and Macedonia where the sump pit is centrally located in the basement. The suction point reaches more of the sub-slab area, and the sealed cover ensures all that suction goes toward pulling radon instead of leaking basement air.
When You Need Sump Pit Sealing
If your home has an open or loosely covered sump pit, it should be sealed — whether or not you currently have a radon problem. Sealing is inexpensive, non-invasive, and takes about an hour. It also helps reduce moisture and musty odors from the sump area.
Not sure if your sump pit is contributing to elevated radon? Start with professional radon testing to get a baseline reading. If you already know your radon level is high, our radon mitigation systems include sump pit sealing as part of the installation. For homes with crawl spaces, see our crawl space radon solutions instead. Contact us for a free estimate.