Drip Edge Troubleshooting

Problem index

1. Drip Edge Omitted at Rakes Entirely

Symptom: Eaves look finished; gable edges show bare sheathing or underlayment only. Common because eaves get the gutter story and more attention on the punch list.

Why it fails: IRC R905.2.8.5 (where adopted) requires drip edge at eaves and rakes. Rake edges take wind-driven rain. Bare plywood edges suck water.

Fix: Measure both eaves and rakes on the takeoff. The calculator has a dedicated rake field on purpose. If the job is already shingled without rake metal, remediation may mean carefully lifting edge shingles — budget that as a repair, not a free punch.

2. Underlayment / Drip-Edge Lap Order Reversed

Symptom: Same lap detail used at eaves and rakes. Water stains at gables after wind-driven rain, or eave leaks where underlayment sits under the metal.

Why it fails: At eaves, underlayment should lap over the drip edge. At rakes, drip edge should lap over the underlayment. Reverse either edge and you open a path for water under the stack. Details: guide — install order.

Fix: Correct the sequence on new work. On existing work, assess whether the edge can be reworked without destroying the field; sometimes the honest answer is a localized tear-off at the edge.

3. Insufficient Overlap at Deck or at Joints

Symptom: Short flange that barely covers the sheathing edge, or butt joints with little or no end lap. Pieces blow or wick at the joint.

Why it fails: R905.2.8.5 calls for minimum 2 in onto the deck and 3 in at end joints. The calculator’s 9.75 ft usable coverage assumes that 3 in joint lap — skipping it to “save” a stick is how joints open.

Fix: Order enough sticks (use the calculator). Cut and lap joints properly; do not stretch one stick across a gap with a hairline butt.

4. Drip Edge Conflicts with Gutter / Fascia Alignment

Symptom: Metal hangs into the gutter trough, fights hangers, or sits so high water shoots over the gutter. Or the vertical leg is buried behind a fascia that was never sized for it.

Why it fails: Drip edge and gutters are adjacent systems. A takeoff that ignores the gutter line creates an install fight on day one.

Fix: Dry-fit before nailing off long runs. Size the trough with the gutter & downspout calculator. Adjust profile, hang height, or hanger placement so the drip kicks into the gutter, not past it or into the hanger.

5. Under-Driven or Missing Fasteners — Lift in Wind

Symptom: Edge metal flutters, nails back out, or the vertical leg lifts in storms. Gaps open at joints.

Why it fails: R905.2.8.5 caps fastener spacing at 12 in o.c. Under-driven nails, missing nails at ends, or fasteners only in soft fascia without deck engagement leave the metal free to work.

Fix: Fasten into solid deck/framing per the adopted code and manufacturer instructions. Re-nail lifted sections; replace damaged pieces rather than hoping a single nail holds a waving stick.