Large Bat House

A - Roof 6" x 28"
B - Front 24" x 28 3/4" (cut slots for vents, 5" above bottom edge)
C - Back 24" x 36"
D - Spacers 1" x 2" (4) 26" long, (2) 31" long, (2) 28 3/4" long
E - Partitions 1/4" thick, 3/4" apart, 26" long
F - Sides 4" x 28 3/4" x 31" (angle-cut top edges)

Use 1/2" exterior grade plywood for front and back sections; 1/4" for all partitions. Sides are 1" x 6" stock.

Staple 1/8" mesh (HDPE plastic) netting to all partitions and the back panel. Apply caulk to all joints.

Begin assembly by screwing the back to the sides. Attach 31" spacers to inside corners.

Place a partition on top of the spacers to within about 1/2" of the roof. Put the next set of spacers (26") on top of the partition and screw into the first spacers.

Repeat for remaining partitions ending with 28 3/4" spacers (flush to roof line). Screw front to sides. Make sure roof angles are aligned.

Screw roof in place and caulk all exterior joints.

Scratch or roughen the front near the vents to provide a toe hold for bats landing on the box.

A dark stain should be applied to all exterior surfaces and tarpaper or shingles to the roof and upper half of the house to increase interior temperatures.

source:DEP