Usually you won't see much of drip edge as it's under the roof shingles, under the underlayment, and behind the roof gutter.
Roof edge with no gutters.
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In some locations, it is acceptable for the roof shingles to line up with the drip edge.
That edge of your roof is called the “rake” edge.
Drip edge goes over the roof deck, under the shingles and directly to the trim (facia or rake boards), behind the back of the gutter.
If there is no gutter, water leaves the edge and zooms out into space away from the building
The only way to fix it was to remove shingles and rotted decking and replace, not cheap.
Gutter trip edge flashing problems how to properly install gutter drip edge 1.
The proven and practical eavestrough system for rainwater dispersal.
Shingles extending off your roof deck (the plywood, osb or wood tongue and groove over your rafters) and ice barrier or felt should extend over a metal drip edge, roof apron or flashing.
Both kinds of flashing are needed, as everyone above has recommended.
Drip edge is about $1.00 per foot, what i had to do was considerably more.
A drip edge allows the water to drip into the gutter by using gravity, and if you don’t have a gutter, then it still stops the water from clinging to your shingles.
A drip edge is a metal device that is placed at the edge of your roof to control the flow of rain water.
However, when permitted it is best to have the roof shingles hang over the drip edge by a minimum of 1/4” and a maximum of 3/4”.
It could be used where you have no gutters, if you use gutter apron everywhere else.
This particular rain gutter alternative can be used in conjunction with a gutter but it works just as well on its own.
Whatever method you use to mount the gutters, install a metal drip edge first.
Provides a clean look to the edge of a roof.