Unscrew and remove the storm window from the outside of the window.
How to trim vinyl siding around windows.
Use tin snips to cut a length of j molding 2 inches longer than the width of the window.
Most trim carpenters don t even use a tape to trim windows.
Here s how they do it.
When installing window molding start at the top.
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.
Cut a 1 inch notch out of the j molding at both ends by scoring it with a utility knife across its top side.
Notch the vinyl windowsill with tin snips to fit the existing windowsill.
It s all done by eye with a sharp pencil a miter saw and an 18 gauge nailer.
Use tin snips to trim off the metal flashing covering the exterior windowsill.