sealing

We are using radon mitigation systems to address a VOC vapor intrusion issue at multiple homes in a residential neighborhood. Many of the homes have multiple foundation types including inaccessible crawlspaces. Our approach for installing a mitigation system for the inaccessible crawlspace portion of these homes was to seal the perimeter block foundation and seal penetrations from the crawlspace to the first floor. We would then insert a 4" PVC pipe into the sealed crawlspace area and use a radon mitigation fan to remove air from this area.