Too much overhang and the shingles could blow off in high winds.
Metal roof overhang drip edge.
Copper is a sturdy metal that gives a roof a unique look.
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A typical metal roof overhang may be 2 to 4 inches or even less.
If this slight overhang is too short water will drip behind the gutters leading to rotted roof sheathing and fascia stained siding and even soil erosion and a flooded basement.
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There is a small size metal rim facing outwards and away from the roof fascia.
Too little can allow water to seep into rake or fascia boards.
While plastic vinyl and fiberglass drip edges may also be available in your area these materials are best suited for use in nonroofing applications such as above doors and windows.
Drip edge profile types.
Drip edge is a metal flashing that tends to overhang the sides of a roof.
How to install drip edge.
Metal is usually installed on rafters or strip sheathing rather than the solid decking used under other materials.
The edge of the shingles should hang over a roof between an inch and an inch and a half or between a half inch and three quarters of an inch if drip edge flashing is installed.
Roof underlayment requirements over drip edge.
It has the main function of controlling water flow on the roof which has many implications.
Roof drip edge specifications are given here.
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Although it does not look like much this component is made to have great structural integrity.
How where should it be installed on roof eaves gable ends.
The lower edge of a roof should extend beyond the fascia board by about 3 4 inch so that runoff drains into the gutters.