Eau Claire Radon Mitigation: Radon Mitigation Services in Eau Claire, Wisconsin

Large commercial buildings need suction across a big footprint, well beyond one mechanical room or slab section. We design multi-point active soil depressurization with several balanced suction points and a commercial-grade radon fan, and a pressure-field extension test confirms that each point draws across its assigned area. The system is coordinated with the building's HVAC and make-up air so it does not create pressure conflicts. Vent stacks discharge above the roofline, and the build follows the ANSI/AARST RMS-LB standard for schools and large buildings.

Apartments and condominiums need a per-building plan for shared foundations and separate living spaces. We test unit by unit, focusing on ground-contact units and common areas. Connected slab sections can share one sub-slab system, while a zoned layout gives separate control where foundations differ. Fans and piping route away from tenant space. HUD radon requirements set testing and mitigation duties for HUD-backed properties, and a per-unit retest confirms the result in each unit after the system is installed.

A crawl space has exposed soil, so it needs a sealed surface before a fan can pull radon effectively. We lay a continuous 6-mil polyethylene vapor barrier, or a heavier sheet where storage and foot traffic call for it. The seams are taped and the edges sealed to the foundation, which also encapsulates the crawl space and cuts soil moisture. A sub-membrane system then draws radon from beneath the barrier, and we confirm the barrier is holding suction before we finish.

Sub-slab depressurization is the core active method under a concrete floor. We cut a suction pit through the slab to reach the aggregate below, then seal the penetrations, joints, and sump cover so basement air does not weaken the draw. A continuous radon fan — what many homeowners call a radon pump — drives the radon vent system, pulling the soil gas up a PVC stack to a discharge above the roofline. A manometer shows the system is holding suction. Added suction points cover a larger or divided slab.

A basement that tests high is the most common radon problem we solve. We fit a sub-slab system, seal the paths radon takes into the finished space, and retest to confirm the drop. Radon reaches a basement through foundation cracks and control joints, the slab-wall edge, utility penetrations, and an unsealed sump, so closing those routes supports the suction under the slab. In a finished basement, we plan the pipe route to keep the visible run tidy, and a manometer gives you a quick daily check that the system is holding. Most homes are finished in a day, and you get a quiet fan and a documented result.

A full installation is the complete, tested radon reduction system, designed for the specific house. We size it from the radon reading and the foundation, then choose interior or exterior routing to fit the layout and keep the visible pipe tidy. Sealing the openings, labeling the system, and mounting a monitor are all part of the build. Discharge placement follows ANSI/AARST guidance so exhaust clears windows and living space, and a post-install test documents the reduction on paper.

During a build, radon control is far cheaper to add while the foundation is still open. Radon-resistant new construction starts with a layer of gas-permeable aggregate under the slab and a vapor retarder above it, with penetrations sealed as the work goes in. A capped vent stack runs from that layer up through the house, all built to current code. If post-occupancy testing finds elevated radon, a fan can later be added to activate the system.

A large building can't be judged by one test in a single room. We lay out a device placement grid by floor area, ground contact, and how each space is used, with the device density set by the ANSI/AARST measurement protocol for large buildings. Continuous radon monitors run over the measurement period under closed-building conditions. Every reading maps back to its area, so owners and lenders get a clear picture for mitigation planning, a property review, or follow-up testing.

Some homes are built with a passive stack, a vent pipe from under the slab to the roof but with no fan. We confirm the stack reaches a proper discharge and seal any gaps left around it, then add an in-line radon fan sized to the pipe. The fan turns the stack's natural airflow into steady mechanical suction, and a monitor lets the homeowner see it is working. A test afterward shows how far the activated system reduced the home's radon.

An older system can lose suction through a worn-out fan, a cracked or separated pipe joint, or a leaking sump cover. We read the manometer first to see whether the system still holds the right pressure difference. A failed or noisy fan gets replaced, cracked fittings are resealed, and a loose sump cover is closed up. Radon fans wear out over years of continuous running, so replacement is normal maintenance. Once suction is back, a retest confirms the repair worked.

Property transactions need a prompt result that buyers, sellers, and inspectors can document. We conduct a real-estate transaction radon test with a 48-hour continuous monitor test, which records readings throughout the measurement period and flags device movement. The monitor runs under closed-house conditions for a defensible result, and we schedule placement and pickup around the transaction timeline and inspection deadline. The completed report identifies the test location, measurement period, average concentration, and monitor data for the sale file.

Homeowners can choose a test based on how quickly they need an answer and how much seasonal variation they want to capture. A charcoal canister test provides a short-term screening measurement. An alpha-track detector supports a 91-day long-term test and can remain in place for up to one year. A continuous radon monitor supplies a faster logged reading with hourly data. We compare the result with the 4.0 pCi/L action level. Elevated short-term findings receive confirmation before we recommend a mitigation system.