When replacing clear vinyl windows on a sun porch you need to measure correctly because they are custom made and cannot be returned. The measurement is usually in ¼ inch increments. Get the fit as close as possible.
When measuring width the lower sash should be raised, measure the width jamb to jamb. Take your measurements from close to the top portion of the window, in the middle and near the bottom.
When measuring the height do it from the head Sash Window Repairs Kent jamb to the sloped sill where the inside of the window stool meets. All windows are not sized alike. When replacing clear vinyl windows on a sun porch you can draw a picture of the walls that have windows, number each window, measure and write the measurements down.
To install the windows remove the old sash. The usual double hung window has two sets of stops that are removable. The outside stop is nailed on and should not be removed. Take the inside stops off carefully, they will be reused. Cut sash ropes, remove lower sash. Take out the blind stop and remove the upper sash. Put the replacement vinyl window in the window opening. If the new window is not wide enough, a strip of wood can fill the space.
Use a carpenter’s square to center the window in the opening. The sides of the window should be shimmed just behind the predrilled holes in the jamb. Replace your inside stop after screwing the window where it should be. Che