Installing Vinyl Siding Under Windows

Gap at all ends.

Installing vinyl siding under windows.

When installing vinyl siding on each side of a window or door start on the side that needs the longer panels. Vinyl siding depends on a few special trim pieces that either hold everything together or hide the edges and ends of the panels. Be sure to check both sides for proper fit. B cut the siding to fit under windows.

Undersill trim for instance is installed under windowsills or other horizontal projections and grasps the top edge of the siding panel below it see installing window trim. When you mark each side add a inch to the width to allow for expansion. Measure the width of the piece you need to cut by holding the length of siding against the window and marking the edge points on the panel with a pencil. When you get to a window you will need to cut sections from the panels directly above and below it to fit.

Drop siding panel into j channel around top of window and install. 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. Measure and cut panel to fit. Fitting siding over windows.

Install siding at the top of a window or door in a similar fashion but this time set the siding on the window channel and use the window trim to mark the cut. Longer siding panels don t stretch as readily as smaller ones so they re not as easy to adjust if they get out of whack. Vinyl siding installation is designed to hang loosely on the sheathing so that it can expand and contract with temperature changes. For more information refer to pages 28 32 of the vsi vinyl siding installation manual.

To get the depth of the notch measure the distance from the locking tab on the siding below to the undersill trim. A mark the cuts for siding under the window. The siding slides behind vinyl siding trim pieces that hide the gap and the cut end. This will leave a panel with an intact nail hem and proper exposure.

Finishing top row of siding under eaves. Install siding around windows. Mark the siding at 1 4 inch past the edge of each. Place the siding that has to be notched under the window.