Hire a Certified Mitigator
While it is not required by law in NC that radon testers or mitigators have any certifications, the NC Radon Program highly recommends hiring a trained professional. The NC Radon Program cannot endorse any particular certification company or individual, so we recommend researching the individuals qualifications and asking for references.
Videos of Mitigation
Following are videos that are intended to provide an overview of radon mitigation practices. The videos are not intended to provide instruction on how to mitigate your home. The NC Radon Program recommends to hire a certified radon professional.
Below are a number of topics that the NC Radon Program recommends addressing with whomever you hire to conduct your mitigation.
- Will the contractor provide references of past radon reduction work? Did you contact references?
- Can the contractor explain what the work will involve and how the radon reduction system will work?
- Did the contractor physically inspect your home’s structure before giving you an estimate?
- Did the contractor review your radon measurement results and determine if appropriate testing procedures were followed?
Do the contractors’ Proposals and Estimates include?
- Proof of current Certification for Radon Mitigation with either National Radon Proficiency Program (NRPP) or NRSB (National Radon Safety Board)?
- Proof of liability insurance and having all necessary licenses to satisfy local requirements?
- Does the contractor charge a fee for diagnostic tests? Many contractors give free estimates, but they may charge for diagnostic tests. These tests may help determine what type of radon reduction system should be used and in some cases diagnostics are helpful for initial design of a system.
- A guarantee to reduce radon levels to less than 4.0 pCi/L and if so, for how long?
Important information that should appear in the Contract includes:
- The total cost of the job, including all taxes and permit fees; how much, if any, is required for a deposit; and when payment is due in full.
- The time needed to complete the work.
- Agreement by the contractor to obtain necessary permits and follow required building and electrical codes. Note: Modification or addition of existing electrical wiring usually requires a licensed electrician.
- Statement that the contractor carries liability insurance and insured to protect you in case of injury to persons, or damage to property, while the work is being done.
- Guarantee the contractor will be responsible for damage during the job and cleanup after the job.
- Details of any guarantee to reduce radon below a negotiated level.
- Details of warranties associated with the hardware components of the mitigation system.
- Declaration stating whether any warranties or guarantees are transferable if you sell your home.
- Description of homeowner responsibilities to make work areas accessible prior to start.
Below is a list of basic installation requirements:
- Radon reduction systems must be clearly labeled to avoid accidental changes to the system that could disrupt its function.
- The exhaust pipes of soil suction systems must vent above the surface of the roof and 10 feet or more above the ground, and must be at least 10 feet away from windows, doors or other openings that could allow radon to reenter the home, if the exhaust pipes do not vent at least 2 feet above these openings.
- The exhaust fan is properly located. For instance, it should be installed in unconditioned space and the exhaust side of the piping should not be routed through any conditioned space.
- A warning device must be installed to alert you if an active system stops working properly. The warning device must be placed where it can be seen or heard easily.
- Post-mitigation radon test should be done within 30 days of system installation, but no sooner than 24 hours after activation. Note: Closed-house conditions for at least 12 hours before test begins.
Build Radon Out
- Radon-resistant new construction (RRNC) typically costs a builder between $250 and $750.
- RRNC could cost less than $250 if the builder already uses some of the same techniques for moisture control.
- For a builder, it is much less expensive to install a radon-resistant system during construction than to go back and fix a radon problem identified later.
- If a new homeowner tests for radon and has to mitigate high levels, it could cost the builder or the owner more than an initial installation.
Building Out Radon - .pdf document
This document describes why radon-resistant new construction should be used. Includes basic information about the health risks associated with radon exposure and how radon enters a home.
This document provides drawings of passive radon control systems. Drawings include a crawlspace radon control system and additional fan for active system for one and two family dwellings.
Green Strides Webinar Series: Technical Webinar - Reducing Radon in Schools (July 18, 2012)
This one hour Webinar provided technical guidance on effective radon testing and control strategies for schools, including how to operate and install a radon mitigation depressurization system. Radon experts Josh Miller (Research Scientist) and Josh Kerber (Environmental Research Scientist) of the Minnesota Department of Health, both specialists in radon control in school environments, were featured in this Webinar.
Download the Full Presentation
You may also download and listen to the following segments:
Part 1: Radon Introduction Overview
Part 2: Expert Speakers Presentation
Part 3: Q&A and Resources
Download the Q&A and Resources Slides with notes (PDF) (8 pp, 299 K)
Managing Radon in Schools - The Indoor Air Quality Tools for Schools Approach: Key Drivers and Strategies for Success
Radon Measurement in Schools (Revised Edition - Second Printing)This report was prepared to provide school administrators and facilities managers with instructions on how to test for the presence of radon. The findings from EPA's comprehensive studies of radon measurements in schools were incorporated into these recommendations. This report superseded Radon Measurements in Schools - An Interim Report.
It is typically easier and much less expensive to design and construct a new building with radon-resistant and/or easy-to-mitigate features, than to add these features after the building is completed and occupied.
Reducing Radon in Schools: A Team Approach. This document will assist you in determining the best way to reduce elevated radon levels found in a school. It is designed to guide you through the process of confirming a radon problem, selecting the best mitigation strategy, and directing the efforts of a multidisciplinary team assembled to address elevated radon levels in a way that will contribute to the improvement of the overall indoor air quality of the school.