Berkshire Radon Technologies LLC

We follow the EPA suggestion of using a “phased approach.” In “Phase I,” we design the system to offer a reasonable potential of achieving sufficient reduction of radon levels. If after testing we find the radon is still too high, we go to “Phase II.” This often means adding another suction point or using a larger fan — for instance, if the slab is laid directly over dense native soil and we need to increase the vacuum field.

Please call us to schedule a site visit and get a written proposal for a mitigation system in your home.

Phase I.

• Basic active sub-slab soil depressurization mitigation, outdoor run.This assumes a typical empty unfinished basement or crawlspace; bare concrete floor and walls; a minimum of 4 inches of 3/4” washed stone under slab; no coverings on floor, wall or ceiling. We use a 3” vent pipe (schedule 40 PVC) exiting through single or double band joist. Price includes up to two suction points (see Phase II below for description of suction point) and standard fan. Call for price.

• Basic system as above, indoor run. The vent pipe is run through the house and out the roof, as a plumbing stack would look, with the fan located in an unlivable attic space. The pipe can run through closets or in a corner of a room and then be boxed in. Carpentry work necessary to box in our work would be the client’s responsibility. Call for price.

Below are additional site jobs added to one of the choices above:
• Installing radon-retardant membrane on dirt or stone floor in basement
or crawl space, or otherwise sealing exposed soil or rock. Call for price.
• Finished basement work penetration: penetration access for vent pipe
in stud wall, sheet rock, finished ceiling, or carpeted floor.Call for price.
• Beam or log band joist penetration, per hole Call for price.
• Concrete or block wall penetration, per hole Call for price.
• Floor drain modification: installation of a Dranjer, which allows water in the
basement to drain out the floor drain as usual but inhibits radon gas from
entering the house. Call for price.
• Sump pit or curtain drain modification and depressurization Call for price.

Phase II:

If Phase I fails to reduce radon levels to an acceptable level –
Often necessary when there is: large slab size, grade beams, footings,
impermeable soil under the slab (gravel or compact dirt - see photos at right), different levels or rooms.
• Additional suction points (pressure field extension). This includes cutting
the concrete floor, removing sub-surface material forming a vacuum sump
hole (approximately 5 gallons under the slab), installation of vacuum pipe
(schedule 40 PVC), air tight seal and interconnecting system piping. Call for price.
• Larger than standard fan. Call for price.

Radon in Construction

Pre-construction planning for radon
More and more, radon is being considered during the planning and construction stages of home-building. We can lay in perforated piping (preferably on a bed of 3/4" crushed stone) before the slab is poured, with a stubbed-in stem. After completion of the home, a radon test is performed. If there is radon, then the rest of the mitigation system is installed using the pre-installed suction point. Please call for pricing.

Our radon systems are guaranteed for 5 years from date of installation. This guarantee is fully transferable between owners within the five year period.


Fan and vent pipe installed on the outside of house

PVC pipe inside the basement – placed into a hole drilled in the floor, running up the wall and out of the basement to the exterior, where the fan and vent pipe will be attached.

3/4" stone under slab: a good porous material which allows for the creation of a large pressure field under the basement floor

Gravel or native soil under slab: impermeable; may require more suction points or a slightly larger fan to create a pressure field

install_membraneInstalling radon-resistant membrane over stone foundation wall

Radon-resistant membrane covering foundation walls and dirt floor, with pvc piping sealed into the membrane creating a sub-membrane de-pressurization system.

Crawlspace sealed with radon-resistant membrane, and pvc pipe leading out to connect with the rest of the system.

Green perforated pvc pipe laid on top of crushed stone, in preparation for pouring the slab. Note the white stub that will be available later for a radon mitigation system.