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Brick and concrete, insulated from the interior
Interior thermal insulation for brick or concrete walls and ceilings: Multistrat, Wolle P800 and a service zone.
Technical content: Bogdan Ivănescu, graduate engineer, PhD candidate at the Technical University of Cluj-Napoca · updated on 16.10.2026
Three zones, each with its own role
Bond Reflectiva Multistrat to the wall and the ceiling, with the aluminium facing the room, then lay the Wolle thermal insulation fibre from the roll over it, without interruptions. On the brackets and profiles, install the second layer of Multistrat, with the aluminium facing the wall, followed by the cladding. Between the profiles, a technical zone remains for building services.
1 cm for the reflective membranes
The two layers of Multistrat are 5 mm each, i.e. 1 cm in total.
Emissivity 0.05
The aluminium face has an emissivity of 0.05 and a reflectivity of between 95% and 97%.
Emissivity: an emissivity of 0.05 means that the aluminium face radiates only 5% of the heat that an ordinary surface would radiate, and therefore does not give off heat by radiation. The lower it is, the better. What this means →Reflectivity: the proportion of the radiant heat reaching the membrane that is sent back. What this means →The insulation is not cut into strips
Wolle is installed before the brackets and is compressed only where these are fixed. Since it is not cut between the profiles, no gaps remain through which the cold can pass.
A space that serves two purposes
Between the profiles there is room for building services, while the two sealed layers of Multistrat enclose this space as a genuine thermos.
Multistrat and Wolle P800
Multistrat is used in two layers, while Wolle P800 in 1.20 m rolls covers the same area, one to one. The profiles, brackets, adhesive and cladding are procured separately.
Installation steps
Click on the central image to enlarge it.
Products for this application
Warranty
- ✓Reflectiva Multistrat: 50-year warranty, service life of at least 50 years
Frequently asked questions
How do I bond the Multistrat to brick or concrete?
With finishing adhesive, applied in spots, not over the entire surface. The substrate must be clean and dry.
Why should I not cut the Wolle into strips between the profiles?
Because the insulation must remain continuous. The Wolle is laid before the brackets and is compressed only at the fixing points, so no gaps remain through which cold can pass.
Where do the building services run?
In the service zone between the profiles, where you run the cables, conduits and boxes without penetrating the insulation.
What is not included in the order?
The profiles, the brackets, the adhesive for the Multistrat and the lining.