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Back to How To....    |   How to Build a Bat Box

Bats eat thousands of insects each night.  Those are insects that cannot eat your garden plants.  Having a bat box is easy insect control.  To build this one, you will need:

1/2” X 2’X4’ of exterior grade untreated plywood

1 tube caulk

1X2X8’ pine (furring strip)

Cut the plywood into three pieces:


1/2”X16 1/2”X24”


Cut the furring strip into three pieces:


1”X2”X20 1/2 “ (2 pieces)

Next, set your saw to cut shallow grooves of 1/16th to 1/32nd depth.  Cut horizontal shallow grooves about every 1/2 to 1/4” on the large piece of the plywood.  This gives the bats something to grip onto when they enter the house.

Next, place a bead of caulk on the furring strips and place them on the grooved plywood, caulk side down.

Next, place another bead of caulk on the top of the furring strips and place the remaining two pieces of plywood on them.  Leave a space of 1/2 inch between the two pieces of plywood.

To make the house more water proof, caulk along the outside of the furring strips on both seams.  Mount your box on a building where there is at least a ten foot clear drop unobstructed by trees, shrubs, or other vegetation.  Bats have to drop down out of the house then start flapping their wings to leave, and you don’t want them bumping into anything on the way out.

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