Crawlspace Problems

Common Problems:

  • Lack of cross-ventilation.
  • Insufficient ventilation openings in surrounding walls.
  • Inadequate clearance between earth and wood components.
  • Water entry into Crawlspace.
  • Lack of code-required access to Crawlspace.
  • Exterior grade slopes toward the building.

Resultant Damage:

  • Mildew, mold and high ambient moisture due to lack of ventilation.
  • Wood rot and structural damage.
  • Ponding against building.
  • Water through foundation wall.
  • Water in Crawlspace.

Proper Design:

  • Provide proper clearances between earth and wood components per the Uniform
  • Building Code (UBC), Chapter 25.
  • Provide adequate ventilation openings per UBC, Chapter 25.
  • Slope grade away from building.
  • Provide cross ventilation per UBC, Chapter 25.
  • Provide Crawlspace access per UBC, Chapter 25.