INTELLO^® - High Reliability Vapour Membrane
The new INTELLO^® possesses the world`s most effective variable diffusion permeability under any climatic conditions and provides maximum potential freedom from structural damage in timber-built systems.
The „intelligent“ behaviour of humidity-variable vapor/vapour retarders provides for highly reliable, safely protected thermal insulating systems, even under unanticipated entry of moisture into the structural system - for instance because of airleakages, flank diffusion or high incorporated moisture in building timber or insulation materials.
Intelligent vapor/vapour retarders act as a moisture transfer pump by actively extracting any unanticipated moisture which might be present in a structural component.

Construction Moisture on the Site
The vapor/vapour retarder must be installed as soon as the thermal insulation has been put in place, in order avoid the development of moisturization in the insulation.
Care should be taken after plastering and screed work to ensure adequate ventilation. A commercial drying unit should be installed if necessary (i.e. dehumidifier).

Buildings with Permanently High Humidity
Humidity-variable vapor/vapour retarders cannot be used in permanently humid climatic conditions, for instance swimming pools, spas, garden centres, etc..

Pitched Roof Systems
Drying reserves of INTELLO^® vapor/vapour retarders generated by low permeability in winter time (high diffusion resistance) and high permeability in summer time (low diffusion resistance) are extremely high, so that pitched roofs are very safe. INTELLO^® vapor/vapour retarders offer for pitched roofs a high potential freedom from structural damage.
When used in conjunction with externally diffusion-open structural systems INTELLO^® vapor/vapour retarders can be used without any limitations, neither to climatic zones nor to altitudes of the location.
When used in conjunction with externally diffusion-tight structural systems there is no limitation in use in cold, humid and hot climate locations.
Even in severe cold climates INTELLO^® vapor/vapour retarders offer a high potential freedom from structural damage in conjunction with both externally diffusion-open and externally diffusion-tight structural systems, e.g. in Yakutsk, Russia, where temperatures drop down lower than - 40°C/- 40°F or in Anchorage, Alaska. (For further information for Russia, please see Russian webside).
In severe cold climate conditions there are only two exceptions: North of the polar circle e.g. in the very northern parts of Canada, Russia, Alaska and Scandinavia, as well as for the northern islands like Greenland and Iceland the sun radiation absorption is not high enough for back-diffusion. At these locations attics should not be used as living space. INTELLO^® vapor/vapour retarders offer perfect protection, if the insulation is installed in the upper ceiling and the ceiling structure is covered with high permeable layers.
The same recommendations are valid for houses in the mountain in extreme cold climates, like ski lodges, where the climate conditions correspond to those north of the polar circle (temperature in summer at no time higher than 20°C/68°F).

Flat Roof and Green Roof Systems
Flat roofs and green roofs have a diffusion-tight external layer, which serves as water seal and protects against roots. Generally these roofs cannot be ventilated effectively as there is no up-draught of air due to the absence of a roof pitch. Futhermore because of the gravel/soil layer on top of the roof, the warming-up of roof structural system is much lower than of pitched roofs due to the lower sun radiation absorptivity. So flat roofs always are among the most demanding and critical thermal insulation constructions in terms of building physics. In cold, mixed humid and warm climates pro clima INTELLO^® can offer solutions with high potential freedom from structural damage for these structures due to the extremely high humidity variability of its diffusion permeability. Moisture which may have entered or which is present in the structure can evaporate to a great amount without leading to harmful humidification. In severe cold climates as well as in alpine climates the potential freedom from structural damage might not be sufficient. It is highly dependent from the height of the layers on the top of the roof. The thinner the layers, the higher the potential freedom from structural damage. Please see studies of the different contries .

Roof Systems in Alpine Regions
Externally diffusion-tight pitched roofs in Central Europe can be constructed safely with INTELLO^® up to an altitude of 1,600m. In higher regions such as 1,600m in Europe there are several solutions like lower roof pitch and black tiles.

Walls
As wall systems are less exposed to solar radiation, they have less back-diffusion potential and therefore they have a lower safety reserve.