The answer is gravity right.
Drip edge no gutter.
A drip edge is normally entirely independent of the gutter system although it is possible to create a gutter where the back face continues up under the roofing in place of the drip edge but it is expensive.
A drip edge is intentionally installed in a tilted position so that it can direct the water away from the roof while protecting the foundation of the roof.
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If the home has no gutter the drip edge will prevent the water from running down the fascia and onto or into the soffit cavity.
It simply guards a carpenter s gap in your house.
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It is always good to get details of these conditions to avoid misunderstandings.
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A big benefit of drip edge is that it prevents your home from an insect s attack.
A heavy wind will push rainwater on to your roof because there will be no drip edge gravity to pull it all into the gutter.
However without the drip edge the water sticks to shingles potentially working its way under the shingles to cause a leak.