Column 20: Outbuildings or Privies Put a check in this column only if the buildings on the premises are dilapidated or otherwise provide significant rodent harborage. A tight, well maintained building or an open, clean shed should not be recorded. lumber, clutter, or large rubbish in an open Appliances shed should be reported in their respective columns if they furnish harborage. Always check this column when privies or outhouses are found. Column 21: Boa Fences and Walls Put a check in this column if dilapidated board fences, walls, or concrete slabs(e.g., patio slabs broken sidewalks) are found because they can provide harborage for rodents.