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Insulation Roll Calculator
Insulation Roll Calculator. Use the actual product label and your measured quantities. Starting values are editable examples, not universal rates or product specifications. Keep the units beside each input.
Method and practical checks
- Coverage and layer count estimate material quantity only. They do not determine the required thermal performance or regulatory compliance.
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Your measurements and assumptions
Use the actual product label and your measured quantities. Starting values are editable examples, not universal rates or product specifications. Keep the units beside each input.
| Measured area | 20 | m² |
|---|---|---|
| Layers | 1 | |
| Extra allowance | 10 | % |
| Pack size | 8.3 | m² |
Method and assumptions
rolls = ceil(area_m2 * layers * (1+waste/100) / roll_coverage_m2)
Coverage and layer count estimate material quantity only. They do not determine the required thermal performance or regulatory compliance.
Whole bay-width strips are cut from each roll. A roll narrower than a bay cannot supply an unjoined strip and is rejected. Offcut reuse is not assumed.
Example with the selected inputs
- Required quantity: 22 m²
- Packs to buy: 3
- Purchase quantity: 24.9 m²
- Left over: 2.9 m²
Change the inputs to match your own task. Whole packages are rounded up after allowances, so purchase quantity and actual requirement can differ. Apply each allowance once.