This insulation reference table shows the batts/rolls needed for a range of area length values, assuming an area width of 5 m, an area per batt/roll of 0.7 m² and a wastage allowance of 5%. Every figure is computed with the same engine that powers our Insulation Calculator, so the numbers are exact.
| Area length | Batts/rolls needed | Area to insulate |
|---|---|---|
| 2.5 m | 19 | 12.50 |
| 5 m | 38 | 25.00 |
| 7.5 m | 57 | 37.50 |
| 10 m | 75 | 50.00 |
| 15 m | 113 | 75.00 |
| 20 m | 150 | 100.00 |
| 30 m | 226 | 150.00 |
| 50 m | 375 | 250.00 |
| 70 m | 525 | 350.00 |
| 100 m | 750 | 500.00 |
How to use this table
Find the row closest to your area length and read across to the batts/rolls needed. For a value between two rows, the real figure sits between them — or enter your exact numbers in the Insulation Calculator for a precise answer.
Need a value that is not in the table? — the Insulation Calculator does it instantly, for free, with the formula and a worked example built in.
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