For the height measure from the top of the bottom track into the top u channel see the diagrams below.
Measure for sliding door.
These numbers should be close to the same but it can be helpful to know both of them.
Do this across the bottom middle and top.
Custom built sliding glass doors meet and or exceed these measurements.
Write down the measurement.
You ll want to measure the width of the door at the center running your tape measure from siding to siding stucco to stucco brick to brick whatever material outlines the sides of your sliding door.
The average widths for three panel doors are nine feet and twelve feet.
If your sliding screen doors are missing determine width by measuring from inside of side jamb to center of stile on opposite side just short of where the stationary glass begins.
Cut away all the old silicone and paint attached to the door.
Again depending on the style of your home measure from the header to the bottom of the door sill siding to the bottom of the door sill or edge of the stucco to the bottom of the door sill.
Measure from the top of the track at one end of the door down to the threshold on the ground with a tape measure.
Using a tape measure begin at the left edge of the opening and measure straight across to the right edge.
Be careful not to damage it.
Pull out any.
To measure the height of a sliding patio door extend your tape measure vertically.
Be sure to capture both width and height measurements.
Go to your sliding glass door and take a measurement from the wall left to right of the door to the wall it is installed in.
Then you will want to measure the height of the doors as well again do three measurements one from top to bottom on the left one in the middle and one on the right.
Insert a utility knife around the door frame and break the silicone seal.
How to measure for replacement sliding glass patio doors.
Remove the slider door trim with a crowbar.
If the doorway has moldings measure from outside edge to outside edge to determine the proper door width add about 4 to 6 inches to your measurement.
Hold a tape measure to the edge of the door and record its thickness.
Ideally the door will cover 2 to 3 inches beyond the opening on each side.
Measure vertically the same way from where the header meets the rest of the home to where the bottom sill ends.
Measure this edge on the door frame known as the jamb as well.
Move halfway down the opening and measure again.