Roof Optim
Diffusion membrane with aluminised foil, in 4 layers.
Technical content: Bogdan Ivănescu, graduate engineer, PhD candidate at the Technical University of Cluj-Napoca · updated on 16.10.2026
Benefits
On the roof boarding, beneath the roof covering: it stops water, allows vapour to escape and reflects approximately 82% of infrared radiation. It has two integrated self-adhesive strips along its entire length.
Where it is used
Applications for Roof Optim
Select the part of the house you wish to insulate.
Warranty
The written warranty depends on the application and is stated on the page of each application.
Calculate the material requirements for your house
Technical data
From the technical data sheet
0.18Emissivity, also after ageingprEN 15976Emissivity: an emissivity of 0.18 means that the surface radiates only 18% of the heat that an ordinary surface would radiate. The lower the value, the better. What it means →
0.07 mWater vapour diffusion resistance, SdEN 12572Sd (m): the degree to which the membrane resists the passage of water vapour, expressed as an equivalent air-layer thickness; high Sd = vapour barrier, low Sd = diffusion membrane, which allows vapour to escape. What it means →
W1Watertightness, also after ageingEN 1928W1: the highest watertightness class for membranes. What it means →
330 / 230Tensile strength, N/50 mmEN 12311-1
75 m²Roll of 1.50 × 50 m, 12 kgEN 1848-2
30 yearsEstimated service life
The sample pack
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.