My coop is under construction and I have a question about my ceiling joists. I'm using 2x4's for these joists and don't plan to install soffit - creating a natural vent around the top perimeter of the coop. Running these joist vertically creates a 3.5" vent around the top perimeter and running these joists horizontally creates a 1.5" vent around the top perimeter. Do you recommend one over the other??? Wondering if 1.5" is enough space to even do anything? But, then again, maybe 3.5" is too much in the colder months (live near Chicago)? I'll have to install hardwire cloth up there to prevent predators (although the roof will have an 8" overhang and the gap will be hard to access). Either way, I'm assuming better safe than sorry??? I only ask because I saw a coop from Purina with the 1.5" vent and no hardwire cloth - which seems awfully vulnerable to me? Thanks!