With helper set window into opening to check fit then remove it.
Measuring for pocket replacement windows.
Follow the manufacturer size recommendations 2.
Down the left side right side and the middle.
New pocket replacement window should be about 3 16 to inch shorter than smallest measurement in opening.
This is the pocket the sill will fit into.
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.
We ll show you how to measure your existing windows to find the size you need.
Measure the window s width in three places top middle and bottom of the window.
Use the smallest of the measurements to determine the width that surrounds the window.
Pocket that exists between the outside and inside stops after the parting bead is removed.
Again you ll need to take three measurements each extending from the top horizontal board.
One at the left side one at the center and one at the right side of the window.
Measuring to determine the correct height for the replacement window is similar to measuring the width.
Replacement windows are sold in a standard thickness to fit inside the 3 1 4 in.
Tips for measuring windows.
Use the smallest of these three height measurements to order the window.
Measure the windows jamb depth.
Standard window sizes vary but you can be sure that replacements you order will have 90 degree corners.
Record the shortest measurement this ensures that the new window will fit.
This measurement should be between 3 5 inches and 5 5 inches.
To check your windows are in square alignment.