On Monday, February 29, 2016 at 10:36:32 AM UTC-5, Don Y wrote:
On 2/29/2016 8:10 AM, TimR wrote:
Take your tape to Home Depot or Lowes. What size are those doors? (the
ones for sale, not the ones you walk through at the front of the store)

That will tell me what they *sell* but won't explain why the two
doors I observed (different homes, different widths, different
construction techniques) are "off".

If all doors are 35.5, then you have determined that a nominal 36 door is actually 35.5.

I find it unlikely a custom door is a half inch different.