EASY COOPS 5x6 Chicken Coop Plan Manual page 5

STEP
Assemble The Top Plates
.1 Assemble the top plates using 3 1/2" x 3 1/2" pressure-treated material.
You will need two boards cut to 6' and two boards cut to 2'-11".
2.2 Secure the beams to the bottom rails with 5", 2" wood screws and 3" x 3" corner brackets.
2.3 Using a speed square or carpenter's square, check the corners to make sure they are 90°.