Got a few nitpick questions about the finishing steps when shingling a hip roof and the hip ridges and main ridge. Worked beside a pro and he would shingle towards the hip-ridge and then came back later and cut every shingle about 3/4" back from the very point of the hip-ridge. He also top/face nailed the edge of each shingle on the top part of it likely to help keep it flat before installing ridge cap.
Is it acceptable to have the shingle cut that far back? Meaning before the ridge cap goes on, you can see all the way to the osb roof sheathing, or to the underlayment in places he didn't slice thru the underlayment? I'm talking probably a 3/4" to 1" gap between each plane of shingles as they butt into 45 degree part of the hip-ridge.
Next, is that nail on the top of the shingle at that edge okay? I know the ridge cap will definitely cover the nails, but it seems like a point water would get in. Maybe not.
Lastly, he didn't get far enough to do any ridge cap. I've watched several videos but none really on the hip-ridge. If I start on the very bottom of the hip-ridge, I assume the first cap will need cut so that it's edges don't hang past the drip edge. Is there any tips when it comes to laying this? So far I've picked up that I'll need to snap a line to keep it straight, and only use one nail on each end of the cap about an inch from the edge, and that when I terminate it, I'll need to cut one cap just above the nail line, flip it 180 degrees so that the sticky side is towards the end of the ridge, and then cut another cap so it's just the shingle color side, and facenail it with tar and granuals for cover. Also when the two hip-ridges come up to the main ridge it looks like I'll need to custom cut some of those to make it lay right.