This is referred to as a j channel.
How to overlap j channel siding.
Measure each piece of trim so that it will be two channel widths longer than the opening itself.
When it is necessary to use more than one sheet of siding to complete a row be sure to overlap successive panels by 1 inch 2 54 cm.
The metal siding will slide into the j trim so install the channel with the opening of the j facing the direction of the siding.
For the doors cut your side j channel pieces similar to the way you did for the windows.
For doors and windows cut and install the top j channel piece flush with the outer face of the side j channels.
Overlap the flashing onto the row of siding just below the window.
For the best results try to create seams as far away from the focal point.
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Step 1 attach the j trim along the line that will form the upper edge of the metal siding.
Cut and bend the drain tab.
Cut a tab in the bottom of the side j channels and fold under.
Install the trim by nail the longer side of the j to the framing lumber with the washer head metal siding nails.
Watch this video learn how to install accessories on multi story structures or very long expanses to allow for expansion and provide water drainage.