Install j channels at doors and windows and under roof eaves and rakes.
How to install vinyl siding trim around windows.
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.
Cut the trim so it is two channel widths longer than the opening s width.
This video shows the installation of siding j channel around doors and windows.
Begin with the vertical sides cutting the bottom for length.
Once your new windowsill is secure glue vinyl end caps to each end.