Why Commercial Building Owners Should Prioritize Radon Testing During Winter

Key Takeaways:

• Winter is the best time to test for radon because buildings are sealed, and radon levels tend to rise.
• Elevated radon levels in commercial buildings, such as multi-family housing, offices, and schools, can put tenants and employees at risk.
• Hire certified radon professionals to ensure accurate testing and effective mitigation.
• Regular retesting every two years is essential, especially after any major renovations.

As a commercial building owner or manager, ensuring the health and safety of your tenants, employees, and visitors is a top priority. One often-overlooked hazard is radon, a naturally occurring, radioactive gas that poses serious health risks when it accumulates indoors. Radon exposure is the second leading cause of lung cancer in the United States, following cigarette smoking, and it can affect anyone who spends significant time in buildings where radon levels are elevated.

Winter is the ideal season for radon testing. For commercial property owners, it’s a crucial time to assess the air quality in your buildings. Whether you manage a multi-family apartment complex, an office building, a school, or any other commercial property, radon testing should be a part of your winter safety checklist. Let’s examine why winter is the best time to test for radon, how to get started, and what to do if high levels are detected.

Understanding Radon and Its Impact on Commercial Buildings

Radon is a colorless, odorless gas that comes from the breakdown of uranium in soil, rock, and water. It seeps into buildings through cracks and openings in the foundation, walls, or floors. Once inside, radon can accumulate to dangerous levels, especially in enclosed spaces with limited ventilation.

Why Radon Testing Matters For Commercial Buildings

In commercial properties, such as multi-family housing buildings, schools, and offices, radon exposure can affect large groups of people who spend extended periods indoors. Whether tenants living in an apartment building or employees working in an office, the health risks associated with radon are a serious concern. In multi-family buildings, tenants may live in lower-level units where radon levels are typically higher due to their proximity to the ground. Similarly, children and workers may be exposed to elevated radon levels in schools or workshops if the building isn’t properly tested and mitigated.

Why Winter is the Best Time for Radon Testing

Radon levels tend to rise during the winter months due to several factors, making testing during this time especially important for commercial property owners.

Reduced Ventilation in Winter

During colder months, buildings are typically sealed tightly to conserve heat. Doors and windows stay closed, reducing ventilation and allowing radon to accumulate indoors. Since commercial buildings often have more complex ventilation systems, radon can become trapped in basements, utility rooms, or lower-level offices and apartments. Winter testing reflects the worst-case scenario for radon accumulation, giving you a clear view of potential risks.

Pressure Differences

In winter, the difference in pressure between indoor and outdoor air can cause a vacuum effect, known as the stack effect, which pulls radon into the building from the ground. Commercial buildings, with their larger foundations and more extensive piping, may be more susceptible to this phenomenon. Testing during winter allows you to identify whether pressure changes contribute to higher radon levels inside your building.

Protecting Tenants and Workers

Ensuring a safe environment is part of your responsibility as an owner of multi-family housing buildings, office complexes, or schools. Testing for radon in the winter months helps prevent long-term exposure to this harmful gas, protecting not just the building’s occupants but also your reputation as a responsible property owner.

How to Test for Radon in Commercial Buildings

Testing for radon in a commercial building is straightforward and crucial for maintaining indoor air quality. Here’s how to approach the process:

Choose a Certified Radon Professional

Unlike residential radon testing, which can often be done with a DIY kit, commercial buildings require more specialized testing methods. Certified radon professionals are trained to assess larger structures, identify potential entry points for radon, and evaluate multiple levels of a building. Hiring a licensed radon specialist ensures that the testing is done correctly and you get accurate results.

Use Long-Term Testing for Best Results

While short-term radon tests (which last from 2 to 7 days) provide a quick snapshot of radon levels, long-term testing is generally recommended for commercial properties. Long-term tests measure radon levels over 90 days, providing a more comprehensive view of the building’s exposure. This is especially important in larger buildings where radon levels fluctuate significantly due to changing environmental conditions and usage patterns.

Retest Regularly and After Renovations

The EPA recommends retesting for radon every two years. Still, additional tests should be conducted if major renovations or changes to the building’s structure, heating, or ventilation systems occur. Even if a mitigation system is already in place, regular retesting ensures that radon levels remain within safe limits and that the system functions effectively.

What to Do If Your Commercial Building Has High Radon Levels

Suppose radon levels in your building exceed the EPA’s action level of 4 pCi/L. In that case, you must implement a mitigation plan to reduce the levels and protect occupants. Radon mitigation for commercial properties typically involves the following strategies:

Sub-Slab Depressurization

This is one of the most effective methods for reducing radon in commercial buildings. A sub-slab depressurization system uses pipes and fans to create a vacuum beneath the foundation, pulling radon from the soil and venting it safely outside. This method is ideal for more significant buildings with basements, crawlspaces, or slab foundations.

Sealing Entry Points

Sealing cracks in the foundation, floors, and walls can help reduce the amount of radon entering the building. While this method alone won’t completely eliminate radon, it is critical to a comprehensive mitigation strategy.

Improving Ventilation

Increasing ventilation in the building can help reduce radon levels. This may involve adjusting HVAC systems to improve airflow or adding additional exhaust fans in areas with the highest radon levels.

The Importance of Radon Testing in Multi-Family Housing

For owners of multi-family buildings, such as apartment complexes, duplexes, or townhomes, radon testing is especially important. Tenants living in lower-level units may be at higher risk of exposure, and radon levels can vary between units, making it essential to test multiple areas within the same building.

As a property owner, keeping your tenants safe and healthy isn’t just good practice—it’s also a smart business move. Buildings with high radon levels can face legal liabilities, and tenants may be less likely to renew leases if they feel their health is at risk. By proactively testing and mitigating radon in your multi-family properties, you can protect your tenants while maintaining the value and safety of your investments.

Radon Testing for Schools, Offices, and Commercial Spaces

Radon testing isn’t just for housing. Elevated radon levels can also affect schools, office buildings, workshops, and stores. In fact, children are more sensitive to radon exposure, making testing in schools especially critical. Suppose you manage a building where employees, students, or customers spend significant time. In that case, winter is the ideal season to conduct a radon test and take action if necessary.

Take Action: Test For Radon This Winter

Radon testing should be a priority for every commercial building owner, especially during winter when radon levels are highest. By testing for radon and mitigating any elevated levels, you’re protecting not just the people who occupy your building but also the long-term value of your property.

Taking proactive steps to test for and mitigate radon will not only keep your building’s occupants safe but also demonstrate your commitment to providing a healthy, secure environment for everyone inside.