Combination Foundations

  • Combination basement/crawlspace or slab-on-grade/crawlspace foundations must have separate radon vent pipes installed in each type of foundation area or be connected with a continuous drain tile loop.
  • Vent pipes must connect to a single vent that must terminate:
    • at least 12 inches above the highest roof in a location
    • at least 2 feet above any window or other opening into the conditioned spaces of the building and
    • 10 feet from any window or other opening in adjoining or adjacent buildings.