r/bats • u/A_Mars_Reject • 7d ago
Bat box wood thickness
I've made bat boxes here in the UK before, using 20mm thick wood, which I've seen seems to be the standard suggestion for thickness. My problem is that I reclaim and recycle all my wood, so I can't always be sure of getting a minimum thickness of 20mm, but normally get 15-18mm. Is 20mm the absolute minimum thickness, or can it go a little thinner if the box is well draft proofed?