13/4" 12"x6' Square Unfinished Pine BoardCan use 1/2" plywood cut to this size too, but this was cheaper.
Instructions
STEP 1. CUT WOOD
Cut list for frame:1 - 72" 2x6 board2 - 24" 2x6 board2 - 4" 2x6 board piecesCut list for Goalie Box2 - 46" 2x6 boards3 - 8.5" 2x6 boards
STEP 2. BUILD FRAME
Use 72" 2x6 board & attach a 24" 2x6 board to each end using 3.5" screws.Reinforce each corner with 4" 2x6 board piece using 3.5" screws.Attach the "crossbar" (3/4" 12"x6' Square Unfinished Pine Board) across the top of the open end of the goal frame. Drill pilot holes if using a prefab board for the crossbar to prevent splitting. Use 2" screws here.
STEP 2. BUILD GOALIE BOX
Take the two 46" 2x6 boards & insert three 8.5" 2x6 boards in-between to create a reinforced box
STEP 3: ATTACH GOALIE BOX TO CROSSBAR
Center your "goalie" on the crossbar, ~12" from inside post of frame.Use 2" screws to attach top of the crossbar into the frame. Drill pilot holes if using a prefab board for the crossbar to prevent splitting.