📏 Drip Edge Length Estimator – Roofing Drip Edge Calculator
Calculate drip edge length for eaves and rake edges to ensure proper roof water runoff protection
Calculate how much drip edge your roof will need. This estimator uses roof length, roof width, waste factor, and optional cost per piece. Drip edge protects your roof’s edges against water intrusion, rot, and wind damage.
Enter the full horizontal span of your roof (eave side). Enter the gable side (roof slope side). Both sides need drip edge. Most drip edge pieces come in 10-foot lengths. Confirm with your supplier. Add extra for cuts, overlaps, and mistakes. Recommended: 5–15%. Enter price per drip edge piece to estimate total project cost.Result will appear here
💡 Tip: Always add 5–15% extra drip edge for overlaps and cutting.
📐 Roof size status will appear here after calculation.
✅ Best Practices:
• Measure both eaves and rakes for full coverage.
• Always overlap drip edge at least 2 inches.
• Install drip edge under underlayment at eaves but over underlayment at rakes.
• Use corrosion-resistant roofing nails for durability.
• Space nails about 12 inches apart along the drip edge.
• Plan for delivery and staging to avoid bent pieces.
• Confirm local building code requirements.
• Order extra for steep, multi-faceted roofs.
• Store pieces flat to prevent bending before install.
• Paint drip edges if desired for aesthetics — use outdoor-rated metal paint.
❓ FAQ - Drip Edge Questions
Q: What is a drip edge?
A drip edge is a metal flashing installed along roof edges to direct water away from fascia and into gutters.
Q: Where do I need drip edge?
Along all eaves (horizontal edges) and rakes (sloped edges).
Q: What size drip edge is standard?
Most residential projects use 2–3 inch overhang drip edge, but sizes vary by code and manufacturer.
Q: How do I overlap drip edge?
Overlap each piece at least 2 inches to prevent water leaks.
Q: Can I reuse old drip edge?
Not recommended — reusing can cause gaps, rust, or poor sealing.
Q: Does building code require drip edge?
In most regions, yes. International Residential Code (IRC) requires drip edge at eaves and rakes.
Q: Can I paint drip edge?
Yes, many roofers paint drip edge to match trim, but use outdoor-rated metal paint.
Q: How much waste factor is safe?
Plan for 5–15% extra, depending on roof complexity.
Q: What material should I choose?
Aluminum is common, but galvanized steel or copper offer premium durability.
Q: How many nails per drip edge?
Typically 8–10 nails per 10-foot piece, spaced about 12 inches apart.