How Far Below Shingles Do Gutter Go

For rainy climates where gutters will handle a larger amount of water for long periods they should have a maximum distance of 18 inches apart between them.
How far below shingles do gutter go. If you live in a warm place with sporadic rain you can hang gutter hangers close to the middle of the gutter with a spacing of no more than 36 inches or three feet apart from the center. The shingles should overhang into the gutter at least 1 in most cases. I have very little faith in most gutter guards. Gutters should be hung where a straight edge laying on your roof shingles can easily extend over the front lip of the gutter this is the proper installment location for the high point of the gutter.
You trade one problem cleaning the gutters for another foundation leaks and landscape wash out. 3 5 centimeters is in the 2 3 inch range. In fact they go as far as reinterpreting roof shingle manufacturer warranties and installation instructions to lead you to believe your roof shingle warranty will be voided if you consider an application under a roof shingle. The back edge of the gutter should tuck up behind the dripedge if you have it otherwise the edge of the shingles should extend well over the back half of the gutter so the drips cannot get behind it and rot the fascia board.
The gap can vary some because the gutters must slope towards the downspout. They work excellent under light rains but in heavy rains it s like the gutters aren t even there. Gutters hung too high or too low. Any more and you run the risk of water running off the tile and overshooting the gutter.
The fact is gutter covers have been installed under shingles for more than 100 years.