How To Install Vinyl Siding Window Trim

Lock the notched siding into place and inspect its fit into the j channel.

How to install vinyl siding window trim.

Notch the vinyl windowsill with tin snips to fit the existing windowsill. Cut the trim so it is two channel widths longer than the opening s width. Lift the unlocked siding to expose the nailing hem of the siding piece below. Remember to leave about a inch for expansion.

Slide the zip tool under the butt edge of the siding hook the locking edge and pull down. Pry off the vinyl siding and j channel from around the perimeter of the window. Unscrew and remove the storm window from the outside of the window. Alternatively vinyl siding can also be trimmed by scoring them with a utility knife at the point at which you wish them to be trimmed and then snapping the piece off along the scoreline.

Install the tops first then the sides and then the bottoms of the window surrounds. Then slide the tool horizontally along the lock to release it. Use tin snips to trim off the metal flashing covering the exterior windowsill. To expedite installing vinyl siding on your home or for large projects you may want to call a professional vinyl siding company.

If your horizontal cut was made at a wider portion of the siding s profile it will fit firmly inside the j channel. Along the tops install j channel trim with horizontal siding and base trim with vertical siding. Not all windows require this but if yours does call a professional for this step. Fashioning metal window trim with a brake is complicated for a do it yourselfer.