Instruction on how to install exterior 2x4 trim around a new or old window. In the video, I staple the metal flashing to the head piece then seal the staples when I paint. You can also hold it on the top and place the top siding over the flashing without nailing or stacking it so that you don't add holes to the flashing. There will always be positive and negative comments, I get it. We all have OUR way! Well this is my way, ENJOY!