Install j channels at doors and windows and under roof eaves and rakes.
How to install window trim over vinyl siding.
Install the tops first then the sides and then the bottoms of the window surrounds.
How to install window casing for vinyl siding 1.
Notch the vinyl.
Exterior window trim on vinyl siding if your home has vinyl siding and you d like to add vinyl window trim you will first need to remove the existing siding and j channel from around the windows.
Lock the notched.
Unscrew and remove the storm window from the outside of the window.
Measure the distance from the inside top of the j channel to the locking tab of the course below and subtract 1 4.
Pry off the vinyl siding and j channel from around the perimeter of the window.
Cut the trim so it is two channel widths longer than the opening s width.
Use tin snips to trim off the metal flashing covering the exterior windowsill.