If not too long a roost 2x2's work well. I don't subscribe to wide flat roosts. If needing more strength for length of roost and weight of birds a 2x3 or 2x4 but I hang it upright. Little poop on the roost and plenty width for them to comfortably grab onto. The theory that their feet are covered on flat roost and not a 1.5 inch roost is not true. To prove this yourself make a 2x2 roost and look at an adult bird roosting on it. Can you see it's feet? No.
Structurally speaking no wood is secured horizontally with smallest dimension taking the weight. Depth of material is what secures load. If a 2x2 can't take the load than a 2x3 will. You can say I'm thrifty or a cheap SOB, either way I don't purchase material for more money that is not needed. 2x2's are my main material in coop construction, main supports are 2x3's and never use 2x4's. It adds up in costs and weight of coop.
Structurally speaking no wood is secured horizontally with smallest dimension taking the weight. Depth of material is what secures load. If a 2x2 can't take the load than a 2x3 will. You can say I'm thrifty or a cheap SOB, either way I don't purchase material for more money that is not needed. 2x2's are my main material in coop construction, main supports are 2x3's and never use 2x4's. It adds up in costs and weight of coop.
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