What counts as a roof facet
A facet is one continuous flat plane of roofing material. A basic gable roof has two facets, one on each side of the ridge. A basic hip roof has four. Add a dormer, a bay window roof, a porch tie-in, or a change in footprint, and each of those additions typically adds one or more facets of its own.
Facets meet at edges, and the edge type matters as much as the facet count. Eaves and rakes are simple terminations. Hips, valleys, and ridges are where two facets join at an angle, and each of those lines needs its own flashing, cutting, and waste allowance. A roof with ten facets does not just have more area to cover, it has more linear feet of hip, valley, and ridge per square of coverage than a roof with two facets of the same total size.
The math: pitch multiplier, and why it has to be applied facet by facet
Area for any single roof plane is footprint area multiplied by a pitch factor: multiplier = square root of (rise squared plus run squared), divided by run. A 4/12 pitch, 6/12 pitch, 8/12 pitch, and 12/12 pitch each carry a different multiplier, shown below.
On a simple roof, one multiplier applied to the whole footprint gets close enough. On a complex roof, it does not, because different facets often carry different pitches. A main roof at 6/12 with a porch roof tying in at 4/12 has to be measured and multiplied separately for each section, then summed. Skipping that step and applying one pitch to the whole footprint is a common source of measurement error on cut-up roofs, and it is one reason a measured report matters more as facet count rises.
| Pitch (rise/run) | Multiplier | 1,000 sq ft footprint at this pitch |
|---|---|---|
| 4/12 | 1.054 | 1,054 sq ft (10.54 squares) |
| 6/12 | 1.118 | 1,118 sq ft (11.18 squares) |
| 8/12 | 1.202 | 1,202 sq ft (12.02 squares) |
| 12/12 | 1.414 | 1,414 sq ft (14.14 squares) |
Multiplier = sqrt(rise^2 + run^2) / run. Apply it separately to each facet's own footprint and pitch, then sum, rather than to the building's overall footprint.
Why more facets mean more labor, on the roof and in the estimate
Every hip, valley, and short run of ridge adds work that a flat two-facet roof does not have. Crews cut more shingles to fit narrow triangular sections near hips and valleys, and those cuts create waste that a full-course run does not. Starter strip, drip edge, valley metal, and ridge cap all get measured in linear feet, and a cut-up roof has more linear feet of each per square of actual coverage than a simple roof of the same size.
That same complexity shows up on the estimate side. A roof with many facets, several pitch changes, or step-flashed dormers usually needs more line items: separate entries for valley metal, additional flashing details, and often more waste allowance built into the shingle quantity. Writing that estimate correctly takes longer than writing one for a plain gable roof, and it takes a more detailed measurement to start from.
Standard vs Complex-roof ESX: how the format is chosen
Because a cut-up roof takes more work to measure and package into a usable sketch, report pricing usually reflects that directly rather than charging one flat rate for every roof. On the sponsor's residential order page, a typical roof with a straightforward footprint and a small number of facets qualifies for the Standard ESX at $19. A roof with many facets, multiple dormers, turrets, or an irregular, heavily cut-up footprint falls under the Complex-roof ESX at $25.
The order page makes the determination when the address is submitted; if you are unsure which tier a specific property will fall into, submit the address and confirm the classification before the order is finalized, or review the current terms on Sketch My Roof roof measurement reports.
Before you order: is this roof Standard or Complex?
- Count the visible facets from the highest-resolution image or exterior walk of the structure
A roof past six or eight facets, or with several roof lines meeting at different heights, is a strong candidate for the Complex-roof tier.
- Check for dormers, turrets, or bay roofs
Each of these adds facets and edges beyond the main roof plane and is the most common driver of complex classification.
- Look for multiple pitches on the same structure
Different pitches on connected sections mean the area math has to be done facet by facet, which adds time to both measurement and estimate.
- Note any irregular or non-rectangular footprint
L-shapes, T-shapes, and additions with offset footprints add valleys and hips that a simple rectangular footprint does not have.
- Decide the output format before ordering
Standard ESX ($19) and Complex-roof ESX ($25) both go into Xactimate®; PDF-only ($25) is the file exhibit; ESX + PDF ($29) delivers both from one order.
Frequently Asked Questions
What exactly is a roof facet?
Does more facets always mean more total roof area?
How is the Standard vs Complex-roof ESX decision made?
Why does the pitch multiplier table matter for a cut-up roof?
Is a Complex-roof ESX priced differently just for having more area?
Sources
- Published residential menu: Standard ESX $19; Complex-roof ESX $25; PDF-only $25; ESX + PDF $29; no subscription, no minimum, ordered by property address: Sketch My Roof residential order page (as of August 2026)
- Report formats include ESX for Xactimate®, XML for Symbility®, and PDF; same calendar day delivery for orders before the 6 PM Eastern cutoff: Sketch My Roof roof measurement service facts (as of August 2026)
- Pitch multiplier formula and area calculation: multiplier = sqrt(rise^2 + run^2) / run; area = footprint x multiplier: Xactware Help Center (as of August 2026)
- Symbility® claims documentation for XML-based estimate imports: CoreLogic claims documentation (as of August 2026)
