Maybe, to be fair the randon sump is probably quite an expensive intervention and migh not be necessary, some airbricks works too, but at the moment, withotu any test result, I am in the dark.
Radon should light things up nicely.
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@Ben689908 started
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Maybe, to be fair the randon sump is probably quite an expensive intervention and migh not be necessary, some airbricks works too, but at the moment, withotu any test result, I am in the dark.