Calculates the number of Onduline corrugated sheets needed for roofing.
The corrugated bitumen roofing (Onduline / euro-slate) calculator works out how many sheets you need from your roof slope dimensions. A standard sheet has an effective width of 0.95 m, a length of 2.0 m and a 0.17 m end overlap.
Sheets per row = ⌈slope width / 0.95⌉ Rows = ⌈slope length / (2.0 − 0.17)⌉ Total = rows × sheets per row
A 6 × 5 m slope. Sheets per row: ⌈6 / 0.95⌉ = 7. Rows: ⌈5 / 1.83⌉ = 3. Total: 7 × 3 = 21 sheets.
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