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Homes with Radon Concerns can be Fixed!

Active soil depressurization is a means of creating a vacuum beneath a slab or plastic sheet and collecting the radon before it enters a building.

Can’t we just seal the cracks?

  • Radon can enter through very small openings.
  • Without affecting house pressures, sealing is not a stand-alone technique.

Treating Crawl Spaces

  • Length of perforated pipe on soil
  • High density, 4 mil. cross-linked or 6 mil. polyethylene
  • Seal to walls, seams and at pads

Perforated Pipe Connected to Suction System

  • Perforated pipe connected to solid Sch. 40 PVC pipe
  • Riser routed to fan
  • Pipe labeled
  • Plastic helps dry out crawl space and reduce mildew and odors

System Depressurization Fan

  • Installed in attic, garage, or outside
  • Must not be installed inside of house
  • Quiet
  • 90 watt fans runs continuously
  • 11 year expected life

System Discharges Away from Building Openings

  • Discharge should be high to avoid radon entering building
    • Minimum of 10 feet above grade
    • 10 feet from openings, 2 feet below discharge
    • Above eave
  • Rain cap not recommneded
  • 1/4 inch bird screen

US EPA Nitigation Standards http://www.epa.gov/iaq/radon/pubs/

A System Performance Indicator is Needed

A U-tube Manometer which is also allows you to know if your system is running properly

Suction Point for Slabs and Basements

  • Hole cut through slab
  • Pit dug out
  • PVC pipe connected to hole
  • Pipe routed to fan
  • May require more than one suction point

Radon Collection via Drainage Systems

  • Cost-effective
  • Care should be taken to avoid conflicts with water collection

Radon Mitigation Works!!

New Homes can be Built with Radon Control Systems

Some Radon can also Enter Building from Water Supply

  • Radon enters water in ground and outgasses in building.
  • Concern primarily isolated to private wells.
  • Typically adds minor amount to air compared to that from soil gas.

National Environmental Health Associations’s National Radon Proficiency Program

  • Measurement and mitigation contractors certified by NEHA have been trained and carry ID cards.

Lists of certified individuals and labs can be found and other helpful information at: http://www.radongas.org or http://nrsb.org

EPA Documents


Citizen’s Guide

What it is & how to test

Real Estate Guide

Testing at time of sale

Consumer’s Guide

How to fix radon

Radon doesn’t have to be a problem!