Measuring to determine the correct height for the replacement window is similar to measuring the width.
Measuring for pocket replacement windows.
Measure the height from the head of the window top fixed frame piece to the windowsill bottom fixed frame piece as with the width take three measurements.
Use the smallest of the measurements to determine the width that surrounds the window.
With helper set window into opening to check fit then remove it.
This is the pocket the sill will fit into.
If the pocket is outside of this range modification to the pocket may be needed and you should call an expert.
Standard window sizes vary but you can be sure that replacements you order will have 90 degree corners.
One at the left side one at the center and one at the right side of the window.
Measure the windows jamb depth.
Pocket that exists between the outside and inside stops after the parting bead is removed.
Measure the window s width in three places top middle and bottom of the window.
Measuring for replacement windows begins with determining that the corners of the existing window frame are square.
Follow the manufacturer size recommendations 2.
Measure from the high point of the sill of your window the surface closest to the inside of the window to the top of the window opening.
This measurement should be between 3 5 inches and 5 5 inches.
Down the left side right side and the middle.
Tips for measuring windows.
To check your windows are in square alignment.
New pocket replacement window should be about 3 16 to inch shorter than smallest measurement in opening.
Again you ll need to take three measurements each extending from the top horizontal board.
Replacement windows are sold in a standard thickness to fit inside the 3 1 4 in.