An aerial roof measurement report is only as useful as your ability to read it correctly. Misreading a single field — like confusing total area with flat area, or ignoring the waste factor — can turn a profitable job into a money-loser. This guide covers every major data field in a professional report and explains how to translate each one into dollars and materials.
Most reports open with a summary that gives you the high-level numbers at a glance. Here's what you'll find and what each means:
This is the gross area of all roof surfaces combined, measured at their actual slope — not flat. A 3,200 sq ft house footprint with a 6/12 pitch will have significantly more than 3,200 sq ft of roof surface area because the slope adds length to each plane. Always use the area from the report, not the footprint from county records.
Reports express area in square feet and roofing squares (1 square = 100 sq ft). A 28-square roof is 2,800 square feet of roof surface. This is your baseline for ordering shingles — before applying waste factor.
The predominant pitch is the most common slope on the roof, expressed as rise/run (e.g., 6/12). This single number doesn't tell the whole story on complex roofs — you need to look at pitch per plane — but it gives you an immediate sense of complexity and labor requirements. Anything above 8/12 is considered steep-slope and commands higher labor rates.
This is the most important number in the report for material ordering — total area plus the calculated waste factor. If the report shows 28 squares base area and a 12% waste factor, your order quantity is 31.4 squares. Most quality reports calculate this for you directly so you can use the number as-is for your shingle order.
Pro Tip
Always verify that the "total with waste" number uses a waste factor appropriate for the roof complexity. Simple gable roofs need 10-12%. Complex hip roofs with multiple valleys and dormers may need 15-20%.
Linear measurements are expressed in linear feet and tell you how much of each type of edge or transition exists on the roof. These drive your accessories order — starter, ridge cap, drip edge, flashing, and valley material.
Ridge is the horizontal peak at the top of the roof where two slopes meet. Ridge length drives your hip and ridge cap shingle order. Standard ridge cap bundles cover approximately 33 linear feet. Divide total ridge length by 33 to get the number of bundles needed — then add 10% buffer.
Hip is a sloped edge where two roof planes meet at an angle, running diagonally from ridge to eave. Hip length adds to your ridge cap requirement. Combine hip + ridge lengths when calculating your total ridge cap order.
Valleys are the internal angles where two roof planes meet and channel water. Valley length determines your valley flashing requirement — whether you use open metal valley, closed-cut valley, or woven valley with ice-and-water shield. Metal valley flashing typically comes in 10-foot sections; ice-and-water shield for valleys comes in rolls covering 75 sq ft. Valley length is also a major driver of waste factor because shingles cut at valley angles generate significant waste.
Eave is the lower horizontal edge of a roof plane — the edge that overhangs the exterior walls. Eave length drives your drip edge and starter strip requirements. Standard drip edge comes in 10-foot sections. Starter strip bundles typically cover 105 linear feet. Divide eave length by 105 to determine starter strip bundles needed.
Rake is the sloped edge at the gable end of a roof. Rake length also requires drip edge. Add rake and eave lengths together for your total drip edge linear footage, then add 10% overlap allowance. Some contractors use a different style of drip edge for rakes vs eaves — the report gives you both numbers separately for exactly this reason.
RoofQuantiX reports include every linear measurement plus area, pitch, waste factor, and penetration locations — starting at $29 for residential properties.
Order a ReportPenetrations include any object that passes through the roof surface: chimneys, skylights, plumbing vents, HVAC curbs, solar mounts, and pipe boots. A quality report identifies each penetration and plots it on the roof diagram.
How to use penetration data in your estimate:
The per-plane section is where experienced estimators spend most of their time. This breaks the roof down into individual facets — each roof plane labeled with its pitch, area, and edge lengths. Here's what to look for:
If your report shows pitch values like 6/12, 4/12, and 3/12 on different planes, that tells you the roof has multiple slope zones. This affects:
If you're using a roofing estimating system, you can often enter individual plane areas directly rather than a single total. This allows the software to apply pitch-specific labor factors to each zone. Cross-reference the sum of all individual plane areas against the report's total area to verify they match (within rounding).
Every professional report includes a top-down diagram of the roof with all planes labeled. This visual is valuable for:
Cross-reference the diagram against your knowledge of the property. If you've visited the site, you should be able to match each labeled plane to the physical structure. If a section appears to be missing from the diagram, contact the report provider to clarify before committing to your estimate.
Let's walk through a sample calculation using hypothetical report numbers for a residential reroof:
This level of detail — available from a single affordable roof measurement report — takes a manual measurement plus significant calculation time to produce. With an aerial report, you're ready to build a complete material list within minutes of receiving the document.
RoofQuantiX delivers professional measurement reports in as fast as 2 hours. Every field described in this guide is included in every report. Starting at $29 for residential properties.
Order NowProfessional aerial roof measurement reports from $29. Delivered in as fast as 2 hours to any US address. No site visit required.
Total area is the combined square footage of all roof surfaces measured at their actual slope. It is expressed in both square feet and roofing squares (1 square = 100 sq ft). This is your base number for material calculations.
Multiply your total area by (1 + waste factor percentage). For example, if the roof is 28 squares and the waste factor is 12%, your material order should be 28 x 1.12 = 31.4 squares, rounded up to 32.
A ridge is the horizontal peak at the top of the roof where two slopes meet at the apex. A hip is a sloped edge where two roof planes meet at an angle along the side. Both require hip and ridge cap shingles but are measured separately because their lengths affect material quantities differently.
Many roofs have multiple planes at different pitches — for example, a main roof at 6/12 and a porch addition at 3/12. Each plane is measured and its pitch recorded separately because pitch affects both the area calculation and the material requirements.
Complete breakdown of every measurement field in a professional roof report.
EducationWhat waste factor is, standard percentages, and how to apply it to material orders.
EducationComplete guide to the basics — definition, contents, and who uses them.