7. The post is centered in the hole using the digging bar if necessary. The post is then twisted so that the front of the box is facing about 135°, or about southeast. The post is leveled but allowed to list backward slightly at a point where the post is best balanced.
Add concrete following directions on the bag. Concrete can be mixed in the hole as well. Pour 1/3 of the cement mix on all sides of the post then add a small amount of water. Mix with the digging bar and repeat until the hole is filled. If the hole is too large and concrete mix is low, add rocks intermittently to the mix.
Select the site for the bat house carefully. A poor location may never be used by bats, no matter how well designed the bat box may be. The eight hours of morning sunlight is of greatest importance when selecting a site, make sure you thoroughly understand this and other points outlined in our "Choosing the right site" section.
BCM suggests that any bat house be mounted on a post. Unconfined like a structure or tree, the relatively portable post is a flexible solution that can be placed anywhere there is enough sunlight. Avoid the temptation for the easy tree mounting, trees are too shady and few if any bats will use the bat house.