Exterior door sill/jamb thickness

[Joe Carrick]

Larry,

I strongly suspect that this is SOP for Chief. Generally speaking the top of an exterior threshold in the real world is 1/8"-1/2" above the finished floor. With in-swinging doors this prevents the weather stripping on the bottom of the door from scraping the finished floor. Twenty years ago I build my house with a flush threshold on the front door - it's been a bit of an annoyance ever since. I wouldn't do it like that again.

I'm just guessing, but when you move a door up or down, Chief is probably just making allowances for what's a non-standard condition. Maybe not right, but......