High Safety Potential
Freedom from Structural Damage
Our Experience for Your Safety
Moll bauoekologische Produkte GmbH developed their pro clima INTELLO® high-performance vapor/vapour retarder in 2004. INTELLO® has the world‘s largest range of humidity-variable diffusion permeability, at any climate conditions ranging from 0.25m (13.20 US perms, 1.25MNs/g) to over 20m (0.17 US perms, 100MNs/g). This high evaporation capacity means that in spring, summer and autumn time a building-component frame work will start to dry out rapidly.
Humidity-variable vapor/vapour retarders like pro clima DB+ have proven their worth in millions of square metres installed since 1991.
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Study: Calculation Potential Freedom from Structural Damage of Thermal Insulation Structures in Timber-Built Systems
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Diffusion-Tight or Open to Diffusion?
Investigations on outside walls conducted in North America in 1999 [1] demonstrated that the entry of moisture through a vapor/vapour barrier having a calculated diffusion permeability of 100m (sd-value), 0.03 US perms (permeance), 500MNs/g (mvtr) as a result of unavoidable air leakeges, even where professionally installed, produces a condensation quantity of about 250g/m2 (3,208grain/square yard) per dew period.
That corresponds to the quantity of condensation diffusing through a vapor/vapour retarder with a sd-value of 3.30m, a permeance of 1.0 US perms respectively a mvtr of 16.50MNs/g during one winter period.
But a vapour barrier does not permit subsequent evaporation in summertime, so moisture traps develop as a result.
If a vapor/vapour retarder or airtightness layer would be diffusion permeable in summertime, moisture that may be present in the structural system could dry out towards the interior.
However, a diffusion-permeable vapor/vapour retarder would let too much moisture permeate into the structural system during wintertime and this would result in to structural damage.
The solution is to install an intelligent vapor/vapour retarder with a humidity-variable diffusion permeability like pro clima`s INTELLO®. It alters its diffusion permeability in relation to the relative ambient humidity. In winter conditions it becomes less diffusion permeable and protects the structural system from moisture. In summer conditions, the intelligent vapor/vapour retarder is higher diffusion-permeable and thus allows moisture which may be present in the system to evaporate towards the inside.
So INTELLO® provides maximum safety for your constructions.
Safety Formula:
Drying Capacity > Moisture Stress => Freedom from Structural Damage
The greater a structural system`s reserves for drying out, the greater the unanticipated moisture stress it can balance and keeping the structure free from structural damage.
How Humidity-Variable Permeability Functions
The direction of the diffusion stream is determined by the difference in water vapour partial pressure, which depends on the temperature and humidity content of the air inside and outside a building. Just to concentrate on the temperature aspect, humidity/moisture streams from the warm side to the cold side, so, in wintertime, from the inside to the outside, and, in summertime, from the outside to the inside.
Thus the vapour membrane finds itself in a drier ambient atmosphere in wintertime (lower permeance) and a more humid ambient atmosphere in summertime (higher permeance).
[1] TenWolde, A.et al.:”Air pressures in wood frame walls, proceedings thermal VII.”
Ashrae Publication Atlanta,1999