EASY COOPS Chicken Coop Plan 3x5 Assembly Instructions Manual page 17

STEP 14
Assemble The Roost
14.1 Assemble the roost using 3/4˝ x 1 1/2˝ pressure-treated lumber.
You will need two boards cut to 2´-8˝ and four boards cut to 2´-6 1/4˝.
14.2 Connect the beams with 2˝ wood screws.
14.3 Install the roost at the studs with the help of 3˝ screws.