Home · Applications · System 10 packages
System 10 packages – habitable attic insulation
All habitable attic packages on a single screen: composition, thermal resistance R at each Wolle thickness, and a quote request for the selected package.
Technical content: Bogdan Ivănescu, graduate engineer, PhD candidate at the Technical University of Cluj-Napoca · updated on 16.10.2026
Would you prefer to choose the layers one at a time? Build your system step by step →
Would you like to see how much you save? Calculate the savings →
Six packages for habitable attics
Composition and thermal resistance R of the entire build-up, at each Wolle thickness between the rafters. Choose the package, enter the surface area and send the request; the optional external membrane is also selected in the request.
System 10 Basic
- Wolle P1500 (λ 0.038) between the rafters, with P800 (5 cm) at the 15 and 25 cm thicknesses
- Phase 1: Reflectiva Gold beneath the rafters
- The sealed air layer, minimum 3 cm
- Phase 2: Reflectiva Multistrat before the plasterboard
Optional: Roof Pro or Roof Optim over the roof boarding.
| Wolle | R, m²·K/W | Conventional insulation λ 0.038 |
|---|---|---|
| 10 cm | 5,082 | 19.3 cm |
| 15 cm | 6,397 | 24.3 cm |
| 20 cm | 7,713 | 29.3 cm |
| 25 cm | 9,029 | 34.3 cm |
| 30 cm | 10,345 | 39.3 cm |
System 10 Basic+
- Wolle P2100 (λ 0.035) between the rafters, with P800 (5 cm) at the 15 and 25 cm thicknesses
- Phase 1: Reflectiva Gold beneath the rafters
- The sealed air layer, minimum 3 cm
- Phase 2: Reflectiva Multistrat before the plasterboard
Optional: Roof Pro or Roof Optim over the roof boarding.
| Wolle | R, m²·K/W | Conventional insulation λ 0.038 |
|---|---|---|
| 10 cm | 5,307 | 20.2 cm |
| 15 cm | 6,623 | 25.2 cm |
| 20 cm | 8,164 | 31.0 cm |
| 25 cm | 9,480 | 36.0 cm |
| 30 cm | 11,021 | 41.9 cm |
System 10 Medium
- Wolle P1500 (λ 0.038) between the rafters, with P800 (5 cm) at the 15 and 25 cm thicknesses
- Phase 1: two layers of Multistrat and Gold
- The sealed air layer, minimum 3 cm
- Phase 2: Reflectiva Multistrat before the plasterboard
Optional: Roof Optim over the roof boarding.
| Wolle | R, m²·K/W | Conventional insulation λ 0.038 |
|---|---|---|
| 10 cm | 5,686 | 21.6 cm |
| 15 cm | 7,001 | 26.6 cm |
| 20 cm | 8,317 | 31.6 cm |
| 25 cm | 9,633 | 36.6 cm |
| 30 cm | 10,949 | 41.6 cm |
System 10 Medium+
- Wolle P2100 (λ 0.035) between the rafters, with P800 (5 cm) at the 15 and 25 cm thicknesses
- Phase 1: two layers of Multistrat and Gold
- The sealed air layer, minimum 3 cm
- Phase 2: Reflectiva Multistrat before the plasterboard
Optional: Roof Optim over the roof boarding.
| Wolle | R, m²·K/W | Conventional insulation λ 0.038 |
|---|---|---|
| 10 cm | 5,911 | 22.5 cm |
| 15 cm | 7,227 | 27.5 cm |
| 20 cm | 8,768 | 33.3 cm |
| 25 cm | 10,084 | 38.3 cm |
| 30 cm | 11,625 | 44.2 cm |
System 10 Premium
- Roof Pro or Roof Optim over the roof boarding
- Wolle P1500 (λ 0.038) between the rafters, with P800 (5 cm) at the 15 and 25 cm thicknesses
- Phase 1: two layers of Multistrat and Gold
- The sealed air layer and Multistrat before the plasterboard
| Wolle | R, m²·K/W | Conventional insulation λ 0.038 |
|---|---|---|
| 10 cm | 5,986 | 22.7 cm |
| 15 cm | 7,301 | 27.7 cm |
| 20 cm | 8,617 | 32.7 cm |
| 25 cm | 9,933 | 37.7 cm |
| 30 cm | 11,249 | 42.7 cm |
System 10 Premium+
- Roof Pro or Roof Optim over the roof boarding
- Wolle P2100 (λ 0.035) between the rafters, with P800 (5 cm) at the 15 and 25 cm thicknesses
- Phase 1: two layers of Multistrat and Gold
- The sealed air layer and Multistrat before the plasterboard
| Wolle | R, m²·K/W | Conventional insulation λ 0.038 |
|---|---|---|
| 10 cm | 6,211 | 23.6 cm |
| 15 cm | 7,527 | 28.6 cm |
| 20 cm | 9,068 | 34.5 cm |
| 25 cm | 10,384 | 39.5 cm |
| 30 cm | 11,925 | 45.3 cm |
Values calculated for the entire build-up, from the Isoflect document “System 10 thermal insulation packages”. “Conventional insulation” is the thickness of an insulation with λ 0.038 that achieves the same thermal resistance R (R × 0.038). The “+” packages use Wolle P2100 (λ 0.035), the others Wolle P1500 (λ 0.038). For Basic, Basic+, Medium and Medium+, the values are for the package without the optional external membrane.
Request a quote for the selected package
Choose the package, the Wolle thickness between the rafters and, where applicable, the optional external membrane. Enter the surface area and see the required quantities.
The package
Wolle thickness between the rafters
Exterior membrane
First, choose the package.
Area
Material requirements
The quantities include 3% for overlaps and waste and are rounded up to whole rolls and packs. For Wolle, the configuration of slabs/rolls is determined according to the predominant clear spacing between rafters.
Choose the package in order to request a quote.
Three zones, each with its own role
A well-insulated habitable attic has three zones, each with its own function: under the roof covering, between the rafters and towards the interior. Below you can see which product goes into each zone, exactly where it is installed and what it does. In this way you know from the outset what to purchase and in what order.
The diffusion membrane: Roof Pro or Roof Optim
It is the first layer from the exterior and is laid over the rafters or over the roof boarding, beneath the counter-battens, followed by the battens and the tiles or sheet metal. It allows vapour to escape from the roof and stops water and dust that penetrate beneath the roof covering. Roof Pro has an aluminium foil face, so it adds a radiant barrier directly beneath the roof covering and reflects part of the summer heat; Roof Optim performs the same functions, with an aluminised reflective layer.
Wolle thermal insulation fibre
It fills the space between the rafters over their full depth and is installed before the interior membranes. It reduces the heat passing through the mass of the material (conduction), with a thermal conductivity from 0.035 W/mK, and also contributes to sound insulation. It does not settle over time, does not irritate the skin during installation, is cut with a knife and is fitted into the bays without leaving joints.
λ (W/mK), thermal conductivity: how easily the material conducts heat; the lower it is, the better the material insulates. What this means →The reflective package: Gold and Multistrat
These are the last two layers, which close the build-up. Gold is fixed beneath the rafters once the insulation between them is complete, and Multistrat is placed before the plasterboard or timber panelling. With the sealed air layer between them, they reflect 95–97% of radiation, stop air currents and control vapour; over 10–15 cm of Wolle between the rafters, the System 10 Basic package: the Basic 10 variant (Wolle P1500, 10 cm) reaches R = 5.08 m²·K/W, equivalent to 19 cm of conventional insulation with λ 0.038, and the Basic 15 variant (Wolle P1500 10 cm + P800 5 cm) reaches R = 6.40 m²·K/W, equivalent to 24 cm. In the Basic+ variants (with Wolle P2100), the values are R = 5.31 m²·K/W at 10 cm (20 cm equivalent) and R = 6.62 m²·K/W at 15 cm (25 cm equivalent).
Not sure which build-up suits you?
Tell us the surface area and the rafter depth, and we will tell you what goes into each layer and in what quantities. You can reach us on 0790 067 438.
Installation steps
Click on the central image to enlarge it.
Products for this application
Frequently asked questions
In what order are the layers installed in a habitable attic?
From the exterior: the diffusion membrane under the roof covering, then Wolle between the rafters, then Gold beneath the rafters and, after the air layer, Multistrat before the plasterboard or timber panelling.
What is the difference between Roof Pro and Roof Optim?
Both allow vapour to escape and stop water and dust beneath the roof covering. Roof Pro has an aluminium foil face and adds a radiant barrier beneath the roof covering; Roof Optim does the same, with an aluminised reflective layer.
How much does the Gold + Multistrat package add to the insulation between the rafters?
With 10–15 cm of Wolle between the rafters, the System 10 Basic package (Gold and Multistrat): the Basic 10 variant (Wolle P1500, 10 cm) reaches R = 5.08 m²·K/W, equivalent to 19 cm of conventional insulation with λ 0.038, and the Basic 15 variant (Wolle P1500 10 cm + P800 5 cm) reaches R = 6.40 m²·K/W, equivalent to 24 cm. In the Basic+ variants (with Wolle P2100), the values are R = 5.31 m²·K/W at 10 cm (20 cm equivalent) and R = 6.62 m²·K/W at 15 cm (25 cm equivalent).
See and touch the products before ordering
The Isoflect sample pack contains samples of the reflective membranes and of Wolle wool insulation, so that you can compare the materials at home or on site.