Summary: together and place them under the top plate. If the 2 pieces of timber do not sit evenly with the edge of the top plate, then extra plywood will be needed to place between the 2 header pieces. Secure the two pieces of header wood with wood screws.Tip: The header will position the upper part of the window framework. 3. Secure the header to the top plate, with the thin sides on top .
Image Dimensions: 550 x 282
Image originally found here.