Installing drip edge properly
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Drip edge corner detail
Install drip edge along the eaves, add underlayment, then place drip edge along the gable end.
The best way is to install the drip edge only along the eaves first, then place ice-and-water barrier (in the
snowbelt) or felt paper (underlayment) over the drip edge. This lets any water that gets on the roof run
down the underlayment and over the drip edge.
Once all the underlayment is applied, go back and place the drip edge along the gable ends of the
roof. Covering the ends of the ice-and-water barrier or felt paper with drip edge ensures that windblown
rain that gets under the shingles will run over the underlayment, not on the sheathing. The drip edge also
helps hold down the felt paper to keep it from blowing off before you install the shingles.
But save yourself some aggravation and get the corners cut on the gable and eave pieces so they mate
properly before installing them. That’s the only way you’ll get clean locking corners.