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Just tested for Radon in a home I just completed, and found it’s in the 50 (picocuries/liter I think) range. Acceptable is more like 4. First story has a finished concrete slab as the floor. We put in a vapor barrier and 2″ of blueboard under the slab, and also roughed in a radon vent pipe, but no perf. pipe under the slab. I’ve ordered an inline fan for the vent, but I’m wondering what else I might do if that’s not enough. I thought an HRV might help create positive pressure in the house. All the other ventilation creates a negative pressure, and probably just makes things worse. Also wondering if the aggregate in the concrete could be emitting radon. Thanks for any help.
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Just tested for Radon in a home I just completed, and found it's in the 50 (picocuries/liter I think) range. Acceptable is more like 4. First story has a finished concrete slab as the floor. We put in a vapor barrier and 2" of blueboard under the slab, and also roughed in a radon vent pipe, but no perf. pipe under the slab. I've ordered an inline fan for the vent, but I'm wondering what else I might do if that's not enough. I thought an HRV might help create positive pressure in the house. All the other ventilation creates a negative pressure, and probably just makes things worse. Also wondering if the aggregate in the concrete could be emitting radon. Thanks for any help.