Quoted:
My father has owned a metal building components manufacturing company for 18 years, ive been around the stuff since I was shittin' in my britches.
What happened there is someone just fucked up.
The sheet metal typically comes off a giant spool and is fed through a sheer that makes on big cut. If the electronic sensor thats counting the length isnt calibrated right it will cut it short, or sometimes long.
and since throwing a way a 43" x10' ft piece of sheet metal is like tossing out 20 bucks.........we unfortunately tend to just go with it.
Are you lapping your drip edge over or under something?
A picture and i might be able to help ya a little more.
No, actually the lean to roof is exactly 10ft X 10ft. It's over my shooting bench. I knew I wouldn't be able to overlap the corners, but I figured I'd get full coverage IF the piece was 10ft. I had to split the missing 1in on either side, so now I have timber showing on the corners.
No big deal, as I'll have shingles over the drip edge and everything is pressure treated, but I wanted to at least look decent, even if you had to step out 10ft or so. It looks like hell now, but that's what I'm going with.