Material Takeoff
The complete quantity matrix, waste scenarios and calculation assumptions in one dedicated sample.
4100 Example Ridge Drive, Plano, TX 75024 (synthetic). Made-up example data, not a measurement of a real home.
Material estimate
Material Estimate
4100 Example Ridge Drive, Plano, TX 75024
- Roof area
- 5,125 sq ft
- Recommended waste
- 15%
- Complex
- Squares with waste
- 58.94
- at 15% waste
- Eaves + rakes
- 516' 4"
- starter · drip edge
- Hips + ridges
- 263' 6"
- hip and ridge cap
Lines that drive accessories
- Eaves — starter, drip edge, ice and water403' 3"
- Rakes — starter, drip edge113' 1"
- Ridges — cap, ridge vent103' 8"
- Hips — cap159' 10"
- Valleys — valley metal, ice and water57' 1"
- Step flashing — step flashing, ice and water96' 9"
- Wall flashing — ice and water65' 0"
Material estimate
Quantity matrix
4100 Example Ridge Drive, Plano, TX 75024
| Product | Coverage | Unit | Waste 0% | Waste 10% | RecommendedWaste 15% | Waste 20% |
|---|---|---|---|---|---|---|
| Shingles (pitched area + waste) | 5,125 sq ft | 5,638 sq ft | 5,894 sq ft | 6,151 sq ft | ||
| IKO — Cambridge | 33.3 sq ft | bundle | 154 | 170 | 177 | 185 |
| CertainTeed — Landmark | 32.8 sq ft | bundle | 157 | 172 | 180 | 188 |
| GAF — Timberline HDZ | 33.3 sq ft | bundle | 154 | 170 | 177 | 185 |
| Owens Corning — Duration | 32.8 sq ft | bundle | 157 | 172 | 180 | 188 |
| BP — Mystique 42 | 32.9 sq ft | bundle | 156 | 172 | 180 | 187 |
| Starter (eaves + rakes) | 542' 1" | 542' 1" | 542' 1" | 542' 1" | ||
| IKO — Leading Edge Plus | 109 ft | bundle | 5 | 5 | 5 | 5 |
| CertainTeed — SwiftStart | 116 ft | bundle | 5 | 5 | 5 | 5 |
| GAF — Pro-Start | 120.33 ft | bundle | 5 | 5 | 5 | 5 |
| Owens Corning — Starter Strip Plus | 105 ft | bundle | 6 | 6 | 6 | 6 |
| BP — Starter Strip | 69 ft | bundle | 8 | 8 | 8 | 8 |
| Underlayment (pitched area) | 5,125 sq ft | 5,125 sq ft | 5,125 sq ft | 5,125 sq ft | ||
| IKO — Stormtite | 914.8 sq ft | roll | 6 | 6 | 6 | 6 |
| CertainTeed — RoofRunner | 937.5 sq ft | roll | 6 | 6 | 6 | 6 |
| GAF — Deck-Armor | 914.8 sq ft | roll | 6 | 6 | 6 | 6 |
| Owens Corning — RhinoRoof U20 | 904.1 sq ft | roll | 6 | 6 | 6 | 6 |
| BP — ProDeck | 914.2 sq ft | roll | 6 | 6 | 6 | 6 |
| Ice and water (eaves, valleys, walls) | 1,624 sq ft | 1,624 sq ft | 1,624 sq ft | 1,624 sq ft | ||
| IKO — StormShield | 193.5 sq ft | roll | 9 | 9 | 9 | 9 |
| CertainTeed — WinterGuard Granular | 193.5 sq ft | roll | 9 | 9 | 9 | 9 |
| GAF — WeatherWatch | 198.6 sq ft | roll | 9 | 9 | 9 | 9 |
| Owens Corning — WeatherLock G | 198.6 sq ft | roll | 9 | 9 | 9 | 9 |
| BP — Weathertex | 193.5 sq ft | roll | 9 | 9 | 9 | 9 |
| Hip and ridge cap (hips + ridges) | 263' 6" | 263' 6" | 263' 6" | 263' 6" | ||
| IKO — Hip and Ridge 12 | 29.53 ft | bundle | 9 | 9 | 9 | 9 |
| CertainTeed — Shadow Ridge | 30 ft | bundle | 9 | 9 | 9 | 9 |
| GAF — Seal-A-Ridge | 25 ft | bundle | 11 | 11 | 11 | 11 |
| Owens Corning — DecoRidge | 20 ft | box | 14 | 14 | 14 | 14 |
| BP — White Cap hip and ridge (1-ply) | 29.6 ft | box | 9 | 9 | 9 | 9 |
| Drip edge (eaves + rakes) | 542' 1" | 542' 1" | 542' 1" | 542' 1" | ||
| Generic — Drip edge, 10 ft | 9.5 ft | piece | 58 | 58 | 58 | 58 |
| Valley metal (valleys) | 57' 1" | 57' 1" | 57' 1" | 57' 1" | ||
| Generic — W-valley, 10 ft | 9.5 ft | piece | 7 | 7 | 7 | 7 |
Continued on next page →
Material estimate
Quantity matrix (continued)
4100 Example Ridge Drive, Plano, TX 75024
| Product | Coverage | Unit | Waste 0% | Waste 10% | RecommendedWaste 15% | Waste 20% |
|---|---|---|---|---|---|---|
| Step flashing (sidewalls) | 96' 9" | 96' 9" | 96' 9" | 96' 9" | ||
| Generic — Step flashing 4 × 4 × 8 in | 2.13 per ft | piece | 207 | 207 | 207 | 207 |
| Ridge vent (ridges less end setbacks) | 91' 8" | 91' 8" | 91' 8" | 91' 8" | ||
| Generic — Ridge vent, 4 ft | 4 ft | piece | 23 | 23 | 23 | 23 |
| Pipe boots (plumbing vents) | 3 | 3 | 3 | 3 | ||
| Generic — Pipe boot | 1 each | each | 3 | 3 | 3 | 3 |
| Coil nails (shingle area + waste) | 5,125 sq ft | 5,638 sq ft | 5,894 sq ft | 6,151 sq ft | ||
| Generic — Coil nails, 1-1/4 in | 1,875 sq ft | box | 3 | 4 | 4 | 4 |
| Not in the matrix | Why |
|---|---|
| Low-slope membrane | No roof area is below 2/12. |
The highlighted 15% column is the waste recommended from the roof's complexity score — a heuristic, not a calibrated rule.
Products in a group are alternatives: choose one per group. Rows are never added together (BOOK-07).
The waste percentage applies to field shingles and the nails that fasten them. Every other group uses its own allowance, the same in every column (BOOK-08).
Each quantity is rounded up once, at the pack, from the unrounded total; no intermediate whole-square rounding (MAT-06).
Coverage values are sample presets pending review (MAT-03). Verify coverage with current manufacturer literature before ordering.
Not included: labour, tear-off and disposal, decking repairs, permits, and any low-slope system until one is chosen.
Assumptions and allowances
How the quantities were derived
4100 Example Ridge Drive, Plano, TX 75024
Estimate basis
- Catalog
- material-catalog-v1
- Review state
- 0 of 31 presets reviewed (MAT-03)
- Policy
- material-matrix-v1 · allowance-policy-v1
- Waste columns
- 0%, 10%, 15%, 20%
- Rounding
- Once per pack, from unrounded totals
- Recommended waste: 15% — Complex (68 of 100 points, complexity-policy-v1)
Never included
- Labour, tear-off, disposal and any dumpster.
- Decking repairs and other hidden conditions: an aerial measurement cannot see them.
- Headwall (apron), chimney and skylight flashing kits, sealants and accessories.
- Permits, overhead, profit and any installed selling price.
How each group is measured
- Shingles: Pitched roof area 5,125 sq ft (2/12 and steeper) × (1 + waste).
- Starter: Eaves 403' 3" + rakes 113' 1" = 516' 4", plus 5% for end laps and corner cuts. The same in every waste column.
- Underlayment: Pitched roof area 5,125 sq ft. Laps are inside each roll's effective coverage; no waste is added. The same in every waste column.
- Ice and water: Eaves 403' 3" × 3 ft + valleys 57' 1" × 3 ft + walls 161' 9" × 1.5 ft = 1,624 sq ft. Estimate setting, not a code determination: one 3 ft course at the eaves, 3 ft centred on valleys and 18 in along walls. Confirm the jurisdiction and manufacturer requirement. The same in every waste column.
- Hip and ridge cap: Hips 159' 10" + ridges 103' 8" = 263' 6". The cap also covers any ridge vent; the vent is its own group, not a second cap line. The same in every waste column.
- Drip edge: Eaves 403' 3" + rakes 113' 1" = 516' 4", plus 5% for corner cuts. Each piece counts at its lapped length. The same in every waste column.
- Valley metal: Valleys 57' 1". Open valleys only; a closed-cut valley needs none. Each piece counts at its lapped length. The same in every waste column.
- Step flashing: Step-flashed walls 96' 9". One piece per shingle course. Headwall, chimney and skylight flashing are not in this matrix. The same in every waste column.
- Ridge vent: 6 ridge runs totalling 103' 8", less 1 ft at each end of each run = 91' 8". Every run is counted; a ventilation plan decides which are vented. The same in every waste column.
- Pipe boots: 3 plumbing vents recorded, one boot each. The same in every waste column.
- Coil nails: Follows the field-shingle area including waste, because the nails fasten those shingles.
The highlighted 15% column is the waste recommended from the roof's complexity score — a heuristic, not a calibrated rule.
Products in a group are alternatives: choose one per group. Rows are never added together (BOOK-07).
The waste percentage applies to field shingles and the nails that fasten them. Every other group uses its own allowance, the same in every column (BOOK-08).
Each quantity is rounded up once, at the pack, from the unrounded total; no intermediate whole-square rounding (MAT-06).
Coverage values are sample presets pending review (MAT-03). Verify coverage with current manufacturer literature before ordering.
Not included: labour, tear-off and disposal, decking repairs, permits, and any low-slope system until one is chosen.
Sources and limitations
Evidence, checks and limitations
4100 Example Ridge Drive, Plano, TX 75024
This report
- Report
- RK-2026-0925-S4R1-R4 · v1
- Generated
- Sep 25, 2026
- Measurement grade
- A — Sample grade
- Imagery date
- Mar 1, 2026
- Geometry
- RoofKarma synthetic massing model (roof-build v1)
- Calculation
- roof-analysis v1 · complexity-policy-v1
- Template
- report-book@1 · R4
- Material catalog
- material-catalog-v1 (presets pending review)
- Material policy
- material-matrix-v1 · allowance-policy-v1
Why this grade
Shown as grade A to demonstrate a complete report. A real report is graded from its source quality, obstruction and automated checks; grade D withholds prices and orderable quantities.
Automated quality checks
| Automated check | Result | Detail |
|---|---|---|
| Every facet closes | Passed | All 17 facets are closed planar polygons. |
| Every line is classified | Passed | No unclassified line; each is an eave, rake, ridge, hip, valley or flashing line. |
| Shared lines counted once | Passed | Ridges, hips and valleys shared by two facets are single lines in every total. |
| Pitch within 0/12 to 24/12 | Passed | Every facet pitch is within the modelled range. |
| Totals recompute exactly | Passed | Facet areas sum to 5,125 sq ft before display rounding. |
| Structures in scope | Note | Detached workshop not included in totals (selectable). |
| Source | Note | Synthetic sample geometry. A real report states its imagery source, date and quality here. |
Check at the property
- Confirm valley and wall-flashing lengths where lower roofs meet walls.
- Check chimney and skylight flashing condition and whether kits will be replaced.
- Count vents and pipe boots; the drawing shows what is visible from above.
- Confirm tear-off layers and decking before finalising the order.
Limitations
- Every figure in this sample comes from an invented house built to exercise the report; it is not a surveyed property.
- Measurements come from above: wall heights, decking condition and the number of layers are not visible from the air.
- No accuracy or certification is claimed; a roofer confirms quantities on site before ordering.