Required Information Notice
Absolute Radon Safety – Required Information Notice
Version: vFinal-2026.01 (v2)
Effective Date: January 2026
This Required Information Notice (“Notice”) provides important information about radon mitigation, testing, system operation, and customer responsibilities. This Notice is incorporated by reference into Absolute Radon Safety estimates, proposals, and services. It is intended to answer common questions and set expectations about how radon mitigation systems function and what conditions may affect results.
1. Purpose of Radon Mitigation
Radon mitigation systems are designed to reduce airborne radon levels within a structure. No radon mitigation system can eliminate radon entirely or guarantee zero radon levels.
Radon levels can vary due to weather conditions, seasonal changes, building use, ventilation patterns, soil conditions, and structural characteristics of the home.
2. Testing and Verification
Post-mitigation radon testing is required to verify system performance.
Unless otherwise specified in writing:
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The customer is responsible for completing a post-mitigation radon test within thirty (30) days of installation
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Approved short-term charcoal test kits are required
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Consumer radon monitors do not replace the required post-mitigation test
Ongoing radon testing is recommended every two (2) years or after major structural or mechanical changes to the home.
3. Radon System Operation and Monitoring
Radon mitigation systems are designed to operate continuously.
The customer is responsible for:
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Maintaining continuous electrical power to the system
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Monitoring system indicators such as manometers or alarms
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Contacting Absolute Radon Safety if system indicators show abnormal operation
Turning off or disabling the system will allow radon levels to increase.
4. Limitations of Consumer Radon Monitors
Consumer radon monitors are useful for long-term trend awareness, but:
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They may not reflect laboratory-verified test results
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They may display short-term fluctuations
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They do not replace required post-mitigation testing
System performance evaluations and any performance commitments are based on approved testing methods only.
5. Radon in Water
Radon mitigation systems address airborne radon only.
If radon in water is suspected:
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Testing and analysis costs are the responsibility of the customer
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For homes served by private wells, radon-in-water testing determines whether water treatment is required
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Waterborne radon levels above 4,000 pCi/L must be addressed at the water source before airborne radon levels can be reliably reduced
6. Crawl Spaces and Site Preparation
Where crawl spaces are present, the following conditions apply:
Crawl spaces must be reasonably cleared and safe to access at the time of service.
Preparation includes removal of debris, construction materials, sharp objects, stored items, organic material, and other obstructions from areas required for radon mitigation or diagnostics.
Bare soil conditions are required unless an existing vapor barrier is present.
When a new crawl space vapor barrier is included in the approved scope of work, existing vapor barriers do not need to be removed by the customer. Existing plastic or membrane materials may be cut, folded back, or adjusted as necessary to access soil surfaces, collection points, or system components required for the work.
Existing vapor barriers are not reused, relied upon, or warrantied unless explicitly stated in writing. The newly installed vapor barrier is the functional component of the radon mitigation system.
If crawl space conditions are not adequately prepared at the time of service, Absolute Radon Safety will proceed by addressing conditions as additional work where feasible in order to complete the installation.
Any crawl space cleanup or preparation performed by Absolute Radon Safety is not included in standard pricing and will be billed separately. Cleanup services start at $300 plus applicable disposal costs, and may vary based on site conditions, labor requirements, and accessibility.
When applicable, a waste management bag may be provided; the customer is responsible for scheduling pickup and associated disposal fees.
7. Crawl Space Insulation Notice
Crawl space insulation may need to be temporarily cut, lifted, displaced, trimmed, or modified to access soil surfaces, foundation elements, or system components required for radon mitigation or diagnostics.
Existing insulation is not guaranteed to be reusable or restorable to its original condition.
Absolute Radon Safety is not responsible for the condition, performance, or replacement of existing insulation that is deteriorated, damaged, contaminated, or compromised prior to or during service. Installation or replacement of insulation is not included unless explicitly stated in writing.
8. Vapor Barrier Installation Information
When included in the approved scope of work, a crawl space vapor barrier is installed to support effective sub-membrane depressurization as part of the radon mitigation strategy.
The vapor barrier is installed over exposed soil and sealed to walls, seams, and transitions as fully as site conditions allow. Installation methods may include mechanical fastening, adhesives, and seam reinforcement.
The goal is to create a well-sealed membrane capable of maintaining negative air pressure beneath it, not to address general moisture management, ventilation, or crawl space encapsulation beyond what is required for radon mitigation.
Unsealed or partially sealed areas required for mechanical systems, piping, structural elements, or limited access conditions will be disclosed when observed.
The vapor barrier is not a structural surface. Storage on the barrier is limited to light storage only when a storage-rated membrane is explicitly included in the scope. Heavy storage, sharp objects, or concentrated loads may damage the barrier and are not covered.
9. Sealing and Access Limitations
Radon mitigation may require sealing cracks, joints, sumps, penetrations, and interfaces.
Finished construction, concealed areas, insulation, or inaccessible spaces may limit the ability to seal certain areas. Additional demolition, access creation, or restoration is not included unless explicitly stated in writing.
10. Drainage and Moisture Considerations
Radon mitigation systems are secondary to drainage systems.
Absolute Radon Safety is not responsible for:
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Sump pump performance or failure
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Drain tile performance or failure
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Window well drainage
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Water intrusion or moisture conditions
Sealed sumps or drainage components may require coordination by the customer for future maintenance or service.
11. Negative Air Pressure and Combustion Air
When appliances such as furnaces, water heaters, or dryers use indoor air for combustion, they can create negative air pressure if sufficient replacement air is not available.
Negative pressure in the lowest level of a home can draw air from beneath the foundation, increasing radon entry.
In some homes, installation of a make-up air or combustion air vent may be necessary to balance pressure and support effective radon mitigation.
Combustion air or make-up air improvements are sometimes required for proper system performance and overall indoor air balance. These conditions are evaluated when observed and discussed if applicable.
12. Post-Installation Changes
Changes to the structure after installation may affect radon levels, including:
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Renovations or additions
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HVAC or ventilation changes
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Drainage or grading changes
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Landscaping, patios, or driveways
Post-installation changes may require additional mitigation measures.
13. Health Information Disclaimer
Absolute Radon Safety does not provide medical advice and makes no representations regarding individual health outcomes related to radon exposure.
For health-related questions, customers should consult:
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The U.S. Environmental Protection Agency (EPA)
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The Colorado Department of Public Health and Environment
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A qualified medical professional
14. Acknowledgment
By approving an estimate or authorizing services, the customer acknowledges receipt of this Required Information Notice and understands the information provided herein.
