If the vertical or horizontal walls are out of plumb the two numbers will differ slightly.
How to measure shower door rollers.
If your new door will swing outward hinged pivot or folding doors take your tape measure and make it the desired width of your shower door then place one end of the tape measure where the door s hinge would be.
Have a look at our short video and see for yourself how easy it.
Compare the two width numbers.
Record this measurement on the paper.
Measure the top width of the shower area where the top of the door will rest.
For spares and parts.
Holding it in place pull the tape measure in a semicircular motion.
Measuring shower rollers wheels and knobs.