Guide: How to Read Your Roof Report (Example)
Important Note:
The data below is taken from a Sample GAF Measurement Report. We provide this guide to help you understand the technical data we use to engineer your specific proposal.
1. Length Measurements: The "Skeleton" of Your Roof
What This Is
A map of every linear foot of your roof’s edges and junctions, including eaves, ridges, and valleys.
Sample Data: This sample roof requires 530 feet of drip edge.
Impact on Your Quote
Every linear foot of drip edge, valley, or hip requires specific metalwork and labor. A high number here (like the 530 ft in this example) means a larger investment in perimeter protection to prevent rotting wood and fascia damage.
2. Pitch & Steepness: The "Safety & Labor" Factor
What This Is
The angle (steepness) of each roof surface.
Sample Data: While the main pitch is 8/12, 21% of this roof is a very steep 16/12.
Impact on Your Quote
Steeper roofs require specialized safety harnesses, staging, and significantly more labor time because workers cannot walk on them freely. If your report shows a high percentage of "Vertical" pitches (like the 16/12 here), your labor cost will be higher than a standard flat-pitched roof.
3. Roof Facets: The "Complexity" Score
What This Is
The total number of individual planes that make up your roof.
Sample Data: This complex roof has 36 distinct facets.
Impact on Your Quote
A "36-facet" roof is highly complex. Each facet requires a junction—a valley, ridge, or hip—which are all potential leak points. High complexity means we spend more time on precision flashing and water-proofing intersections to ensure a 100% leak-free finish.
4. The Summary Table: No More Guesswork
What This Is
A consolidated "Bill of Materials" that tracks every single piece of hardware needed.
Sample Data: This report tracks exactly 115 pieces of step flashing.
Impact on Your Quote
Most roofers guess these numbers and then send a "surprise" bill later. Because we track it down to the piece (like the 115 flashing pieces here), our proposal is final. You are paying for the exact materials required—nothing more, nothing less.
5. Waste Factor: Planning for Perfection
What This Is
The extra material needed to account for overlapping shingles and cutting around gables or chimneys.
Sample Data: For a 36-facet roof, a 20% waste factor is the engineering standard.
Impact on Your Quote
Complexity creates waste. A roofer who quotes a 10% waste on a 36-facet roof will run out of material mid-job. We calculate the 20% upfront so your project has a seamless finish with perfectly matched shingle batches.
6. Ventilation: The "Longevity" Engine
What This Is
The airflow system (Static or Powered) that keeps your attic cool and prevents shingle "cooking."
Sample Data: With a total area of 6,445 sq ft, this roof requires significant airflow.
Impact on Your Quote
We calculate the "Net Free Area" based on your roof size. Choosing the right system (like a Powered Exhaust Fan for larger footprints) might have a higher upfront cost but can save you thousands in future energy bills and shingle replacement costs.