Place the piece of siding to be installed under the window along the bottom edge and hold it where it will be located.
How to install window trim over vinyl siding.
Install j channels at doors and windows and under roof eaves and rakes.
Pry off the vinyl siding and j channel from around the perimeter of the window.
Install the tops first then the sides and then the bottoms of the window surrounds.
Lock the notched.
How to install window casing for vinyl siding 1.
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.
Unscrew and remove the storm window from the outside of the window.
Cutting and installing the siding 1.
Measure the distance from the inside top of the j channel to the locking tab of the course below and subtract 1 4.
Notch the vinyl.