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Thermal Conductivity
How many bags do you need for your roof?
You don't need to work out R-values or bag quantities yourself.
The thicker the insulation layer, the better it prevents heat from passing through your ceiling. A thicker installation therefore uses more material per square metre.
A single bag covers approximately 3.8 m² to 5.4 m², depending on the insulation thickness required.
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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