Radon From Concrete and Soil. The methods of mitigation in the
E.I.S. are good, as far as they go. However, ventilation of crawl or attic
spaces and/or the use of A.A.H.E. is more effective when used in conjunction
with barrier strategies.
Interior Slab on Grade.
It is especially true in areas of high ground moisture content that
prior to the pouring of concrete, a layer of plastic is installed to prevent
moisture leaching through the floor (see Fig. 5.). I assume this plastic is
also effective at inhibiting gasses from passing from the soil to the slab.
let us take the concept of barriers one step further and apply an impermeable
sealing coat to the cured concrete floor. This should stop gasses trapped in
the slab from entering the home, thus drastically reducing the pollution an
A.A.H.E. would have to handle. Retrofitting this sealant is a possibility
for problem homes that might be encountered in the mineralized regions. I
propose the use of sealing coatings for concrete to be studied under the
delayed option plan. This should not however, delay the immediate
implementation of the full weatherization program to all homes.
Homes With A Basement -Unheated Storage/Workspace.
If there is an entrance to the basement from the living area, that
door should be fully weather-stripped and the frame caulked. Next, any
penetrations through the ceiling of the basement for plumbing, electrical
wiring, or any other holes should be caulked. The next concern is
ventilation. The basement should be vented to prevent moisture problems.
This would also reduce radon concentrations. Of course you will want to
insulate the basement ceiling and the installation of a general vapor barrier
might be considered.