Since bats need the rough surface to cling to. Options are to rough the surface with a utility knife, cut saw kerfs or use rough cut material for the interior surfaces. I used the saw Kerf method and mounted two saw blades on my radial arm saw with a spacer about 3/8" thick. The partitions were ran through the stacked blades, reversed, ran through again, flipped and the process repeated. Next, I moved the saw head out 1" and repeated. This resulted in both sides being grooved/kerfed. The front and back panels were ran through. One side only. This photo shows the kerfs/grooves and the ventilation holes in the partition. These are the are the grooved panels to be cut to size for the lower front.
They have grooves on one side only.
For the exterior landing area supports, I took a piece of 1 x 12 pine and cut the grooves on one side. This board had a lot of heart pine in it and should last for years. After kerfing, I ripped to 3.5" width. This photo was taken with them on top of the partitions. Click the photo for detail..
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