ASD – Active Soil Depressurization


There are actually 3 types of ASD. In homes with poured concrete basement floors, the slab is penetrated as you saw in the video in yesterday’s post. Some homes have sump pits that can be used to suck the radon from. This way no holes need to be drilled into the concrete basement floor. Check out this video to see how this type of system is installed. However, in homes with crawl spaces on open soil, a tarp must be spread across the soil and sealed to the walls to act as a barrier between the soil and the crawl space. Once the tarp is sealed, an intake pipe can be attached to the tarp to route the radon up into the air. A length of perforated pipe is laid on top of the soil running the length of the crawl space. The pipe will collect the radon from beneath the plastic sheeting when connected to a fan.

Perforated pipe is used to collect soil gas laid on floor of crawl space.

A high density, cross laminated polyethylene sheeting is then laid on the soil. This type of sheeting is very durable and resists tearing.

High density polyethylene lay on dirt with edges and seams sealed

The seams should be overlapped and sealed. The edges should also be sealed to the walls of the crawl space, to ensure system efficiency and to help keep the plastic stationary. The use of a durable plastic prolongs the life of the system and may allow storage in the crawl space.

After the plastic has been installed, a solid PVC pipe is connected to the perforated pipe beneath the plastic. The PVC pipe is then routed to the radon fan.


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