Install j channels at doors and windows and under roof eaves and rakes.
How to install vinyl siding trim around windows.
Along the tops install j channel trim with horizontal siding and base trim with vertical siding.
Cutting and installing the siding 1 place the piece of siding to be installed under the window along the bottom edge and hold it where it will be located horizontally along the wall.
This video shows the installation of siding j channel around doors and windows.
Once your new windowsill is secure glue vinyl end caps to each end.
Cut the trim so it is two channel widths longer than the opening s width.