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Sheet count, weight and today’s amount
The edge the gutter runs under.
From eave to ridge, along the slope.
Roof faces
Sheet profile
Width of the flat strip before forming; the weight uses this width.
The width one sheet covers once installed.
When the slope is longer than one sheet. Empty means no lap.
For the weight and today’s price.
Roof sheets
—sheets
The result appears hereEnter Eave length, Slope length and Sheet length.
Keep the final list, and its cost at each day’s prices, here:Project shopping list
Method
Sheets across = eave length ÷ cover width, rounded up. Along the slope one row is enough when the slope is no longer than a sheet; otherwise each further row adds “sheet length minus end lap”. The product of the two, times the number of faces, is the sheet count.
Without a slope length the tool takes it from the span and the ridge rise (Pythagoras): for a gable, √((span ÷ 2)² + rise²); for a single face the whole span replaces half of it. A gable’s ridge is as long as its eave — the run of ridge cap.
A corrugated sheet is roll-formed from a flat 1000 or 1250 mm strip and keeps all of its steel, so the weight uses the coil width, not the cover width: thickness (mm) × coil width (m) × sheet length (m) × 7.85. The cover width only sets the count. This is the standard weight of the sheet’s steel; roofing sheet is sold by the kilogram and the amount uses this weight and today’s price.
The tool works out count and weight from the roof’s geometry. Pitch, purlins, sheet thickness and fixings are the designer’s and the installer’s decision.
Reference table
Weight per metre of sheet length (thickness × coil width × 7.85) and the cover width of the common profiles. Each die has its own cover width; enter that in the tool.
| Thickness (mm) | 1,000 mm coil | 1,250 mm coil |
|---|---|---|
| 0.4 | 3.14 | 3.925 |
| 0.45 | 3.532 | 4.416 |
| 0.47 | 3.69 | 4.612 |
| 0.48 | 3.768 | 4.71 |
| 0.5 | 3.925 | 4.906 |
| 0.6 | 4.71 | 5.887 |
| 0.7 | 5.495 | 6.869 |
| Profile | From a 1,000 mm coil | From a 1,250 mm coil |
|---|---|---|
| Sinusoidal | 85 | 105 |
| Trapezoidal | 78 | 98 |
Divide the eave length by the cover width and round up: that is one row. When the slope is longer than a sheet, the next row laps the one below. Multiply by the number of roof faces. The tool above does this with your dimensions.
A gable with a 10 m eave and a 5 m slope, in sinusoidal sheet with a 105 cm cover width and 5 m length, takes 10 sheets a face and 20 in all. At 0.5 mm from a 1250 mm coil each sheet weighs 24.53 kg and the roof 490.63 kg.
It is the width a sheet covers once formed and installed, narrower than its coil. Sinusoidal: 85 cm from a 1000 mm coil and 105 cm from 1250 mm; trapezoidal: 78 and 98 cm. Each die has its own cover width; enter the one of the sheet you are buying.
Thickness (mm) × coil width (m) × length (m) × 7.85. A 6 m sheet, 0.5 mm thick, from a 1250 mm coil: 0.5 × 1.25 × 6 × 7.85 = 29.44 kg. The cover width does not change the weight.
Pick the item from the “Product” list; the amount is shown at that product’s price today. “Add to cart” or “Proforma” records the line with the calculated weight, and an Ahantime expert calls to finalise the order.