Radon in expansion joints

695 Views 4 Replies 4 Participants Last post by 3onthetree, Feb 29, 2020

Anglib56789#

Discussion Starter · Feb 29, 2020

My basement has expansion joints on floor that I can see gravel with a flashlight so guess radon is coming in this way mostly. Before I put in a radon fan what’s the best way to seal these joints up. Asking because I have a lot of joints to seal. Thank you

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stadry

· #2 · Feb 29, 2020

interesting as rare to see 'expansion' joints in an area where conc dimension's stable,,, what's the ambient radon reading ? typically you'd use closed cell backer rod & (polyurethane/silicone/polysulfide) concrete sealant,,, much cheaper to install air exchanger on timer than radon system

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Anglib56789#

Discussion Starter · #3 · Feb 29, 2020

My radon readings are like 14 to 15, noticed the expansion joints need to be sealed up then plan on installing a radon fan in the sump so hopefully radon readings will go down. First I thought sealing with cement but that will crack so will try a backer rod and tube sealer.

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Chris616

· #4 · Feb 29, 2020

After much research this is the product that I chose to use for sealing the crack between the concrete slab and foundation in our basement as part of our radon mitigation project.

https://www.dap.com/dap-products-ph/dap-30-self-leveling-concrete-masonry-high-performance-sealant/

Chris

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3onthetree

· #5 · Feb 29, 2020

The interior field of a basement should have "control" joints rather than "expansion" joints. Goodness, that looks like a seismic fault, not a control joint.

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Radon in expansion joints

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