Replacement windows do not require vinyl siding to be removed. Replacement windows are updated, meaning they're designed to slide into your home's existing frame. The important thing is that the frame and sill are in good condition. This means that the frame and sill are free of rot and mold.
Before you hammer or pry anything, you need to know what you're working with. To do this, measure the window that is currently in place. Simply measure the length, width and diagonal of the window without including the frame. Get a replacement window cut with these measurements.
Once you've removed the molding and drywall (potentially), it's time to remove the old window. Remove the nails or screws that hold the window in place. From there, remove the brackets by tapping them with a hammer. In existing homes, old vinyl or metal siding must be removed, but vinyl can be installed over old wood siding without removing it.
Installing vinyl over wood siding requires considerable preparation and may also require adjustment of window and door frames to achieve a wider wall. You can easily avoid the need to remove or replace the coating during your window project. With Simonton, window siding and replacement is no concern because your refurbished windows fit the existing frame. Finally, it's time to finish off the interior aesthetic by replacing the trim to cover the foam and the sealant that fills the gaps.
The drywall surrounding the window inside the house can also hinder the process of removing the window, so in some cases it is better to remove it, although keep in mind that this will add time to the project, since it will need to be replaced. Measure the width, height and diagonal of the window from the edge of the frame to the edge of the frame, making sure not to measure the edge, as it is installed separately. Replacement windows (also known as upgrade windows) have been developed so that a contractor does not have to remove exterior materials from the house to install the window; they are measured to fit into an existing window opening and will only replace the window itself. It is my understanding that new build style windows can be removed and the nailing flaps installed without removing the surrounding siding and the j channel.
As a general rule, the flashing along the sides of the window should extend about five inches from the edge, two inches beyond the top, and overlap the lower flashing by at least two inches. Remember to add the end caps to the window sill and stick them in place to hide the hollow interior and protect it from the elements. Remember to have enough help on hand, as windows can often be heavy and difficult to maneuver. Once you know what you're getting into and have everything you need, it's time to start replacing the window.
This vinyl casing can usually be found in the same color as the siding and can be found on the perimeter of the open space in the wall after removing the window. The last thing you'll want after installing your new window is to find moisture or air circulating around the perimeter. Then we'll take care of a full Simonton window and siding replacement installation, putting everything back in place. If the window is too large, it is better to return it and get the right size, otherwise you will have to cut the opening unprocessed, which is a job that is best left to professionals.