Is drip edge necessary on a roof?
What it does
- Directs water: sends runoff into the gutter instead of letting it wick back under the shingles onto the deck edge and fascia.
- Supports the shingle edge: keeps overhanging shingles from drooping or curling.
- Closes the gap: covers the space between the deck and fascia where wasps, squirrels and birds get in.
- Protects the deck edge: OSB and plywood edges swell and rot when they stay wet.
Code and local enforcement
Drip edge requirements for shingle roofs have been in the IRC since the 2012 edition, and Georgia building departments enforce them; Cherokee County, for example, publishes drip edge guidance for inspections. The rules call for 2 inch overlaps, at least 1/4 inch below the sheathing, at least 2 inches onto the deck, and fasteners no more than 12 inches apart.
What happens without it
Many older Georgia roofs lack drip edge. Common results are rotted fascia and deck edges, water stains on soffits, gutters pulling away from soft wood, and animal entry. These problems develop slowly and are usually discovered at tear-off.
Replacement and insurance
Because it is a code item, drip edge belongs on every replacement estimate, including insurance estimates, even if the old roof never had it. Whether code upgrade costs are paid depends on your policy's ordinance or law coverage.
Metal roofs
Metal roofs use eave and rake trims that do the same job.