Insulation packages for rafters 10 cm deep
Published on 06.06.2025 · Isoflect Insulation technical team
Total performance for 10 cm rafters
Isoflect System 10 systems – Compact solutions with proven efficiency
When the space between the rafters is limited to only 10 cm, most conventional insulation materials can no longer deliver the performance required for an energy-efficient house.
The Isoflect System 10 systems, however, achieve impressive thermal resistance values thanks to an intelligent combination of Isoflect Wolle technical wool and specialised layers of thermo-reflective membranes.
Thermal performance – for all 6 available configurations
| Configuration | R (m²·K/W) | U (W/m²·K) | λeq (W/m·K) |
|---|---|---|---|
| System 10 Premium+ – with Wolle P2100 | 6,211 | 0,161 | 0,0254 |
| System 10 Premium – with Wolle P1500 | 5,986 | 0,167 | 0,0264 |
| System 10 Medium+ – with Wolle P2100 | 5,911 | 0,169 | 0,0267 |
| System 10 Medium – with Wolle P1500 | 5,686 | 0,176 | 0,0278 |
| System 10 Basic+ – with Wolle P2100 | 5,307 | 0,188 | 0,0275 |
| System 10 Basic – with Wolle P1500 | 5,082 | 0,197 | 0,0287 |
R (m²K/W), thermal resistance: the extent to which the layer or assembly opposes the passage of heat; the higher it is, the better it insulates. What it means →U (W/m²K): how much heat passes through one m² at a difference of 1 °C between the interior and the exterior; the lower it is, the better (U = 1/R). What it means →λ (W/mK), thermal conductivity: how readily the material conducts heat; the lower it is, the better the material insulates. What it means →
All values are calculated for real configurations, with Isoflect Wolle insulation installed between 10 cm rafters and supplemented by the Isoflect package of thermo-reflective membranes, in accordance with each specification.
Components of the System 10 systems
Isoflect Wolle technical wool:
Isoflect thermo-reflective membranes:
In the Base and Basic+ versions, Phase 1 (two Multistrat membranes + Gold) no longer applies.
In the Medium+ and Basic+ versions, the Roof Pro membrane is not included.
Essential benefits:
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No mould, no settling, no emissions of volatile substances
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Perfect dimensional stability – does not lose its shape over time
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Effectively eliminates thermal bridges
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Complete protection against moisture, wind and UV radiation
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Non-irritant, odourless and safe for installers
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Guaranteed performance throughout the service life of the building
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Manufactured from recycled materials, 100% recyclable
Comparison with other materials
To achieve the same value of R ≈ 6.211 m²·K/W, a conventional insulation would require:
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Conventional insulation with λ 0.038: ≈ 24 cm
Isoflect System 10 Premium+ achieves this performance in only 10 cm – without loss of usable space and without compromise.
See all available packages here:
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Isoflect System 10 – Real technology, real efficiency, in only 10 cm.
Part of the complete guide: Insulating the habitable attic — cases, layers and thicknesses.
Not sure which Isoflect product suits you? See the complete map — which Isoflect product is installed in each area of the house or open the package configurator to find out exactly what you need and in what quantity.