• cobylamarche

The Crawl Space

Some of the most challenging radon mitigation projects include addressing a crawlspace. The floors in crawl spaces can vary from bare soil to concrete covered. In the case of a concrete covered crawl space, a sub-slab depressurization system may prove successful. Where the crawlspace floor is bare soil, it will likely be necessary to install a sealed membrane and collect soil gas from below the membrane using a radon fan, a technique called sub-membrane depressurization.

Dealing with a crawl space will be more expensive than a “typical” radon mitigation project. Material costs are significantly higher (i.e., 10 mil to 15 mil membrane, sealant, mechanical battens) as are the time and effort required to install the system. Limited access and headroom are trademarks of crawl spaces and can make otherwise relatively simple tasks complicated.

The good news is that sub-membrane depressurization systems, when designed and installed properly, are very effective at mitigating indoor radon levels.

7 views0 comments

Recent Posts

See All

Is Sealing the Sump Enough?

In many circumstances, radon mitigation of a residential property has two main components: 1) sub-slab depressurization 2) the installation of a sealed cover on the groundwater sump. We are often aske


We recently provided soil vapour mitigation design support to the redevelopment of a brownfield site contaminated with chlorinated solvents. You may have heard of trichloroethylene or tetrachloroethyl