Building A Bat House

  • If you’re building your houses, use a combination of exterior grade plywood and cedar. Don’t use pressure-treated wood. Be sure to caulk all seams.
  • Make sure your bat houses are at least two feet tall, 14 or more inches wide, with a three- to six-inch landing area that extends below the entrance.
  • Any number of roosting chambers will work, but having more is better.
  • Place roost partitions 3/4 to one inch apart.
  • Roughen all landing areas. Scratch wood surfaces horizontally or cover them with durable plastic screening.
  • Build vents six inches from the bottoms of all houses.
  • Remove wasp nests in late winter or early spring before wasps or bats return.
  • Build or buy open-bottomed houses so birds, mice, squirrels and parasites are less likely to set up camp, and so guano does not accumulate.
  • If your area gets average high temperatures in July of 80 degrees or less, your bat houses should get at least 10 hours of sun and should be painted black.
  • You’ll need less direct sunlight – about six hours a day – if your average high temperatures in July average less than 100 degrees, but more than 80 degrees. In the 85 to 95 degree range, paint the bat house dark brown or gray. If your July temperatures usually hover around 95 to 100 degrees, paint the bat house medium or light colors.

From:  http://www.agway.com/how_to/projects/projects/building_a_bat_house.html

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