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Thermal Conductivity
How many bags do you need for your roof?
The number of bags you will required will depend on the size of your roof as well as the thickness of the insulation required (R-Value).
On average each bag will cover 3.8 sqm for the highest thermal resistance R value of 3.38.
The graph below provides you with a breakdown of the number of bags you require depending on your required R-Value and the area it will cover.
| 1 | 2 | 3 | 4 | 5 | |
|---|---|---|---|---|---|
| Thermal resistance R M2 K/W | Installed fitted thickness | Settled thickness | Min Mass per unit area Kg/M2 | Max Coverage M2/bag | Min Bag usage rate bags/100M2 |
| 2.50 | 100mm | 100mm | 2.6 | 5.4 | 18 |
| 2.88 | 115mm | 115mm | 3.1 | 4.5 | 22 |
| 3.13 | 125mm | 125mm | 3.4 | 4.1 | 24 |
| 3.25 | 130mm | 130mm | 3.5 | 4.0 | 25 |
| 3.38 | 135mm | 135mm | 3.7 | 3.8 | 26 |
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