Drip edge is a linear takeoff. Measure the eaves and rakes where the roof assembly requires edge metal, add specified laps and corner details, then convert the total run to available stock-piece lengths.
Add the eave and rake runs that require drip edge, include product-required joints and cuts, then divide by usable stock-piece length and round up.
Published: September 23, 2026
Last reviewed: September 23, 2026
Published by BuildYard. The guide reflects BuildYard's calculation methodology and editorial standards and does not replace project-specific professional advice.
Add eave and rake runs that receive drip edge.
Do not use total roof perimeter blindly when some transitions use different flashing.
Adjacent pieces overlap, so installed linear coverage is slightly less than gross stock length.
Use the selected product and roofing-system instructions for lap requirements.
Outside corners, inside corners, and roof-to-wall transitions can create extra cuts.
Plan these details before rounding the stock count.
Divide adjusted linear footage by usable coverage per piece and round up.
Keep different profiles or colors as separate order lines.
Edge-metal placement relative to underlayment and roof covering is system-specific.
Follow current manufacturer instructions and applicable project requirements.
Estimate ridge vent length from required exhaust NFA, usable ridge length, product NFA per linear foot, and balanced intake capacity.
Read guide →RoofingEstimate attic intake and exhaust net free area from attic floor area, applicable ventilation ratio, balance, and product NFA ratings.
Read guide →RoofingEstimate roof sheathing fasteners from panel layout, supported edges, intermediate framing, specified spacing, and a purchase allowance.
Read guide →A simple roof with 80 ft of eaves and 60 ft of rakes starts with 140 linear ft of drip edge before joint/cut allowance and stock-piece rounding.
Current manufacturer data, supplier specifications, drawings, field measurements, applicable codes, permit requirements, and qualified professional guidance can take priority over a general-purpose planning estimate.