In this step you will build and insert the header at the top of the frame.

The header is made of two 2x4s with 1/2" sheet material sandwiched in between them. See image 2 for a close-up of the header.

First, fit the pieces together so that they are all flush with each other. Use clamps or a partner to hold them in place.

Screw them together with pairs of 3" screws - one pair on each end and one pair in the middle.