Why the two totals almost never match exactly
A roof report states a measured area, a pitch per facet, and linear footage for eaves, rakes, ridges, hips, and valleys. An Xactimate® sketch drawn in the estimate captures the same roof as a set of connected shapes with pitch applied per facet or per group. Both are trying to describe the same structure, but one is a published report with its own rounding and grouping conventions, and the other is a sketch built inside the estimating platform with its own conventions. The two will agree closely on well-defined, simple roofs and diverge more on cut-up roofs with many small planes.
None of this means one number is wrong. It means the reconciliation step is part of the workflow, not a sign of a bad report. The goal is to explain the difference line by line, not to chase a perfect match to the tenth of a square.
The pitch multiplier and why one facet can move the whole roof
Both a report and a sketch convert flat footprint area to sloped roof area with the same underlying formula: pitch multiplier equals the square root of (rise squared plus run squared), divided by run. A steeper pitch produces a larger multiplier, so a small pitch disagreement on even one large facet can move the total by more than it looks like it should.
The table below derives the multiplier from the formula for common pitches. If the report calls a facet 6/12 and the sketch was drawn at 5/12, that single facet's area is off by roughly six percent, and that difference can account for most of a total-square gap on an otherwise well-matched roof.
| Pitch (rise/run) | Multiplier = sqrt(rise^2+run^2)/run | 1,500 sq ft footprint -> squares |
|---|---|---|
| 4/12 | 1.054 | 15.81 sq |
| 6/12 | 1.118 | 16.77 sq |
| 8/12 | 1.202 | 18.03 sq |
| 12/12 | 1.414 | 21.21 sq |
Multiply footprint area by the multiplier, divide by 100 to convert square feet to squares. Confirm any pitch dispute against field photos of the eave-to-ridge rise, not against either document alone.
Waste is not a measurement difference
Waste percentage is a line item entered inside Xactimate® to cover cuts, offsets, and starter or cap material, and it is applied on top of the measured area, not baked into the report's stated squares. If the estimate total looks higher than the report total, check whether a waste percentage was applied in the sketch before assuming the report undercounted the roof. Comparing the report's raw squares to the estimate's squares after waste is the single most common false alarm in this reconciliation.
Per Xactimate®'s own documentation, waste factor entry and calculation behavior is a platform function; verify the current field and its effect on total quantity in your build (menus vary by version).
Facet grouping: one line versus several
A report typically lists each distinct roof plane as its own facet with its own pitch and area, including small planes over bump-outs, dormers, and porch roofs. A sketch drawn to match the estimate sometimes combines two or three adjacent planes that look similar in the field into a single shape at one averaged pitch, especially on complex roofs where redrawing every small plane is not practical for the line items being priced.
This grouping difference shows up as a facet-count mismatch more than a total-area mismatch, and it is usually fine for pricing purposes as long as the combined shape's total area and total ridge, hip, and valley footage still reconcile to the report. Where it matters is steep or unusually pitched small planes (a porch roof at a shallower pitch than the main roof, for example), where averaging the pitch across a combined facet will understate or overstate that section's area.
Reconciliation checklist
- Total squares, report versus sketch (before any waste is applied)
This isolates the raw measurement comparison from waste, which is a separate estimating decision.
- Facet count and each facet's stated pitch
A single mismatched pitch on a large facet is the most common source of a total-square gap.
- Linear footage by line type: eave, rake, ridge, hip, valley
Linear totals catch grouping and boundary differences that the overall square total can hide.
- Structure list: main roof, attached garage, detached garage, porches
A structure included in one document and excluded from the other creates a gap that looks like a measurement error but is a scope error.
- Footprint boundary at eaves, especially over patio covers or carports
Some footprints exclude open, unroofed structures that a field sketch might include or vice versa.
- Penetrations and deductions (skylights, large chimneys)
Confirm both documents are handling deductions the same way before comparing net area.
When the gap is normal and when to request a revision
A small, explainable gap, a facet or two of rounding, a waste percentage difference, a grouping choice you can trace, does not need a revision. Document the reconciliation in the claim file and move on. A gap that traces to one of the items below is worth a revision request rather than a manual override, because it points to an error in the underlying report rather than a normal convention difference.
Request a revision when: the property address or parcel boundary is wrong (an adjacent structure was measured instead of the subject), a structure named in the order is missing from the report, a facet's pitch contradicts clear field photos of the same slope, or the footprint includes or excludes a permanent structure it should not. Per the sponsor's published terms, corrections and revisions on a Sketch My Roof roof measurement report are requested directly from the delivery email rather than through a new order.
Documenting the reconciliation in the file
Save both documents, the report and the final sketch export, in the claim folder with a short note explaining any variance over a square or two: which facet, which pitch, and whether waste explains the rest. That note is what turns a routine reconciliation into a defensible file entry if the total is questioned later in the claim.
If your workflow starts from an ordered report, keep the order confirmation with it; Sketch My Roof roof measurement reports are ordered by address with no subscription and revisions available from the delivery email, which keeps the correction trail attached to the same order rather than scattered across a new one.
Frequently Asked Questions
Should the report's total squares and the Xactimate® sketch total always match exactly?
What's the fastest way to find where a total-square gap is coming from?
Is a grouped facet in the sketch a mistake?
How do I get a report corrected instead of manually adjusting the sketch?
Sources
- Pitch multiplier formula and facet-level pitch and sketch conventions used in Xactimate®: Xactimate® official documentation (as of August 2026)
- Symbility®/CoreLogic sketch and quantity conventions for claims estimating: Symbility® / CoreLogic claims documentation (as of August 2026)
- Order terms: no subscription, no minimum, corrections and revisions available from the delivery email: Sketch My Roof roof measurement service facts (as of August 2026)
- Reports ordered by property address; formats include ESX for Xactimate®: Sketch My Roof residential order page (as of August 2026)
