Measure from the back of the interior trim to the back of the exterior trim.
How to measure exterior french doors.
Measure full height of opening from head exterior trim to threshold where storm doors will attach.
Measure the width and height of your old door and round this number up to full inches.
To get the total width multiply the width of each door by 2 and add 2 inches.
Jot down the jamb width next record your jamb measurements.
When beginning to measure for your new exterior door start by simply measuring the width and height of your old existing door.
First the height of the door reveal the wall opening needs to be measured deducting 20 millimetres afterwards.
Measure the width of the studs used to frame the opening.
Measure the width of the opening stud to stud in 3 places the top middle and bottom and record the smallest measurement.
The most commonly used framing studs have nominal widths of 4 inches 3 5 inches actual and 6 inches 5 5 inches actual.
Proper measurements are critical to getting the right door the first time.
Round these measurements up to full inches in order to more easily find the replacement door size.
Double doors extra in width for t astragal.
As an example you would round up a measurement of 79 5 inches to 80 inches.
If your opening does not match a standard you need custom french doors.
The rough opening is typically about 1 1 2 wider than the unit size and about a 1 taller.
Compare your dimensions with the standard french storm door opening size guide.
With new buildings the fact that there are no doors or windows installed makes it easier to determine the measurements for the installation of a french door.
Measure full width of opening from jamb exterior trim where storm doors will attach to the trim.
Next measure the jamb width.