Couple questions to feed my curiousity.

[DKAudio]

I have 2 general questions about exteriors.

#1
Above the front and back doors on my roof, there is what appears to just be AL sheet metal under my shingles. It is only about 5" wide and under 1 row of shingles for about 5 feet. Was this to help divert water away from dripping where the doors are? This piece is nailed in with common galvanized roofing nails. I put up gutters 2 years ago and was wondering if I can remove it since it makes my shingles look warped and sticking up in that area. If so, any tips on how to remove it without cracking/damaging the shingles that will need to be lifted up to expose the nails?

#2
I built my shed last summer and followed basic plans. This was my first time framing, roofing, and siding. The siding is vinyl .055" (the nice thick stuff from private home builder, not Home Depot). I made my own truces out of 2X8s to make a common center peak. Therefore, on the front and back there is no overhang and the entire wall is flat up to the roof. Because of no overhang, my vinyl outside corners are open on all 4 corners at the front and back. When is rains water runs right inside the outside corners, is this ok and common? The shed is sheathed with CDX and does have Tyvek wrap.

Thanks

[pushkins]

Question 1.

Yes, often when gutters are not installed this strip of bent gal. or aluminum under a course of shingles to simply guide the water away from a doorway or deck entrance, who wants to walk through a waterfall on their way out or in ?...lol (Today 99 degrees...I DO !!!!!!!)

Ooops, almost forgot, to remove the strip, gently pry up the shingles with a flat pry bar a little at a time all the way along the drip edge length, when you have it up enough to see the nail head holding the drip edge then pry up these nails, when your done run a bead of asphalt shingle caulk (horrible black tar in a tube) right along the bottom edge of the shingles and pree the upper layer back down onto it. (WARNING.....the asphalt caulk/roofing caulk doesn't come of skin easy).

Question 2.
Is it common...no, 95% of builds will have some sort of overhang even if it is just 6" or a bird box to accommodate the corners.

Is it OK....no, I'd seal them up with a good quality exterior caulk. You might have to have a couple of goes at it simply because it's a big hole, unless you can get hold of some caulk filler strip, then just push that in and then top of with a good bead of caulk.
The area that the water is going down is only protected by the tyvek , if there is a tear or a nail hole or a nail for that matter then moisture will get in.

[DKAudio]

Hmm, I assume you have worked with outside corners? The hole is massive and no possible way to caulk it. What is I use minimal expanding foam coated with some type of sealer once the foam is cured and trimmed?

[pushkins]

Yes I've from time to time come across the exact same thing that you have. Yes you could use "window and door" foam (blue can) and then trim it back.
Caulk would give you a much smoother finish to paint, but you won't be able to see much of it anyway.