📏 Drip Edge Length Estimator – Roofing Drip Edge Calculator
Calculate drip edge length for eaves and rake edges to ensure proper roof water runoff protection
Estimate the total drip edge required for your roof using length, width, and waste factor inputs. Optional cost estimation is included for budgeting. Drip edge prevents rot, wind damage, and water intrusion along eaves and rakes.
Enter the full horizontal eave span of the roof. Enter the gable side (slope edge) length. Both sides need drip edge. Most drip edge pieces come in 10-foot lengths. Add 5–15% for cuts, overlaps, and mistakes. Enter cost per 10-ft piece to estimate total expense.Result will appear here
💡 Tip: Always add 5–15% extra for overlaps and cuts.
📐 Roof size status will appear here after calculation.
✅ Best Practices for Drip Edge Installation:
• Measure all eaves and rakes for total coverage.
• Overlap each piece at least 2″.
• Install under underlayment at eaves, over it at rakes.
• Use corrosion-resistant nails spaced ~12″ apart.
• Add 5–15% extra for waste and corners.
• Confirm local code requirements.
• Store pieces flat to prevent bending.
• Paint drip edge to match trim if desired (use outdoor-rated metal
paint).
❓ FAQ – Drip Edge Questions
Q: What is a drip edge?
A metal flashing installed along roof edges to direct water into
gutters and away from fascia.
Q: Where do I need drip edge?
Along all eaves (horizontal) and rakes (sloped edges).
Q: What size drip edge is standard?
Typically 2–3″ overhang, depending on code and manufacturer.
Q: How do I overlap pieces?
Overlap 2″ minimum to prevent leaks.
Q: Is drip edge required by code?
Yes — most regions under IRC require drip edge at eaves and rakes.
Q: What materials work best?
Aluminum is common; galvanized steel or copper for premium projects.