When the roof shingles do not extend past the metal drip edge the water will suck back on the metal drip edge this is called capillary action and run behind your gutters.
Detailed view seamless gutters installed behind drip edge.
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If there s a drip edge installed where the fascia meets your shingles and the gutter is hung below the drip edge get some roll flashing and tuck it up under the drip edge and over the top of the gutter.
Once the apron s in place fasten it with sheet metal screws.
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Drip edges have two key purposes.
Direct water away from fascia.
A drip edge is designed to take advantage of those forces and along with gravity direct water into the gutter.
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Due to cohesion surface tension and other forces water droplets tend to stick to one another and to the surfaces they are on albeit slightly.
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Some rain runoff by capillary action runs up under the shingle drip edge and down the fascia behind the gutter.
This problem is common with homes that have roofs that do not have much pitch to them.
Installing drip edge on a new roof or re roofing job.
Does the gutter go under over or behind a drip edge.
For example most ranch style homes have a 3 12 or 4 12 pitch roof.
The roofer installed the drip edge tight against the fascia.
There was no way that the gutter installe was going to get the upper edge of the gutter behind the drip edge.
Posted by everything gutter on sep 15 2015 in downspouts gutter cleaning gutter guards gutter repair gutter sagging ice dams leaky joints leaky seams new gutters seamless gutters seamless rain gutters comments off on does the gutter go under over or behind a drip edge.