self-regulating
Vapour controlÂ
An intelligent vapour control layer (VCL) membrane is an self-regulating membrane that adjusts its vapour resistance to the amount of moisture it is exposed to. If the structure on the cold side or in the insulation package cannot breathe sufficiently, the risk of condensation arises. An intelligent self-regulating vapour control layer will be vapour retardant in the winter. But should there still be moisture between the vapour control layer and the roof boarding in the summer, the membrane will release this vapour into the room.
In which situation
Are you using an intelligent vcl?
An intelligent VCL is a unique membrane of its kind. Because this membrane self-adjusts its functionality based on the temperature and humidity of a room, these membranes are also called variable or vapour check layers. Intelligent VCL’s have a dual function; breathable in summer and vapour retarding in the winter.
An intelligent VCL is most suitable when a vapour control or vapour barrier membrane has been used on the outside of the structure. This is often the case with flat roof construction, for example, where moisture does not escape through the cold side. Intelligent vapour control layers are only suitable for areas with climate class 2 and 3 such as living rooms, bedrooms or offices. This membrane is not suitable for humid areas such as a bathroom or sauna.
Discover our intelligent vpl’s
Miofol® Active is an airtight intelligent vapour control layer with a dual function: vapour controlling in winter and breathable in summer.
Breathable in summer
In summer, the air contains a lot of moisture, both inside and outside. Because it is often warmer outside than inside in summer, vapour pressure causes moist air to enter the structure where it condenses. An intelligent VCL then has a breathable function and allows moisture to leave the structure back into the interior space. Especially in cases where structures contain a thick layer of insulation, it is essential that moisture can dry to two sides. Regular vapour control membranes are constant vapour controlling throughout the year, which means that in summer they can only dry to one side, making it take longer for a structure to dry again. The double action of an Intelligent VCL such as the Miofol® Active gives the material breathability in summer. This way the construction dries faster!
Vapour controlling in winter
In winter, it is cold outside and warm inside. The warm air inside contains more water vapour so vapour pressure builds up from the inside to the outside. Water vapour is therefore forced out through the wall and roof, from the inside. Depending on the functionality of the vapour control membrane applied, some of this moisture will enter the structure. If you then fail to ensure that this moisture can leave again, condensation will develop in the structure, causing wood rot and mold. An intelligent VCL has a vapour barrier function in the winter, preventing moisture from affecting the structure. Thus, the structure is always optimally protected!
The right way to install an
intelligent vcl
An intelligent VCL such as the Miofol® Active is always used on the warm side (inside) of the structure in combination with insulation materials such as mineral wool, rock wool or glass wool. The membrane can be attached directly to the mineral wool by staples.
We recommend an air cavity between the membrane and the wall finish for optimal moisture control. Preferably apply the film horizontally, keeping in mind overlaps of at least 10 cm. For optimal performance of the membrane, it is essential to seal the overlaps airtight with VASTR® Non-woven tape.
Instructional videos
Here’s how to process a climate membrane
Installation videos
Here’s how to process an intelligent VCL
Only by properly applying an intelligent VCL will you protect the structure and improve energy performance. In our installation videos, we explain to you step by step how best to apply our products.
Buy your membrane at
our
dealers
Meuwissen Gerritsen specializes in the development and production of technical building membranes including vapour control membranes, breathable membranes, vapour barrier membranes and so much more. With membranes from our well-known A-brands, you are assured of the best quality membranes. With now over 1200 points of sale, you can find our products at building materials stores throughout the Benelux.
Since 1954, the market leader in
building
membranes
Since 1954, Meuwissen Gerritsen has been the market leader in technical building membranes as a family business. At our own factory in Haarlem, we produce only high-quality technical construction films. We continuously modernize our machinery to provide you this quality.
Do you have a technical question and want to get in touch with one of our experts? Send us an email or call the number below and we will be happy to help you!
Frequently Asked
questions
When do you use an intelligent VCL?
Because intelligent VCL’s automatically adjusts its action to the humidity in the room (and thus the season), it is ideally suited for structures with a vapour barrier layer on the outside such as a flat roof. An intelligent VCL is also often used when renovations are not sure what type of insulation was used in the past. So you can always be sure that moisture in the room and construction is regulated.
What is the difference between an intelligent VCL and a regular vapour control membrane?
The main difference between intelligent VCL’s and vapour control membranes lies in their ability to regulate moisture. A vapour control membrane is designed to prevent moisture from entering the structure, while an intelligent or variable vapour control membrane not only keeps moisture out, but is also able to regulate moisture from the inside to the outside. This means it adapts to moisture levels, making it a more advanced option for moisture control.
Where is an intelligent vcl applied?
An intelligent VCL is always applied on the inside (warm side) of structures. This membrane is only suitable for rooms with climate class 2+3 and not for humid rooms with climate class 4 such as a bathroom or sauna.
How do you apply AN INTELLIGENT VCL?
The installation of an intelligent VCL requires careful attention to detail to ensure its effectiveness. The membrane can be applied directly to the insulation material with stainless steel staples. Whenever possible, apply the membrane horizontally, making sure that the printing is legible. In addition, our advice is to use an air cavity between the membrane and the wall finish for optimal moisture control. Allow for overlaps of at least 10 cm and seal the membrane airtight with the appropriate tape for optimal performance.
Why is an intelligent vcl self-regulating?
 An intelligent VCL is self-regulating because the material is designed to adjust its permeability to water vapour according to moisture levels inside and outside the structure. When humidity increases (in summer), the membrane allows more moisture through (breathable membrane), and when humidity decreases (in winter), permeability decreases (vapour control membrane). This self-regulating property ensures an optimal moisture balance, which improves the insulation value and longevity of the structure.
Is AN INTELLIGENT VCL suitable for any construction?
Although this membrane is versatile and suitable for a wide range of applications, it is not always the best choice for every construction. Suitability depends on the specific humidity and temperature requirements of the structure, as well as the insulation materials and construction techniques present. For example, an intelligent VCLÂ is not suitable for rooms with climate class 4 such as a bathroom or sauna.
How does AN INTELLIGENT VCL contribute to energy savings?
An intelligent VCLÂ helps save energy by improving the thermal efficiency of a building. It helps keep heat in during winter and out during summer, resulting in less energy consumption for heating and cooling. These improved insulation properties provide a comfortable indoor environment and can save significantly on energy costs.
Can AN INTELLIGENT VCL be installed in existing buildings?
Yes, an intelligent VCLÂ can be installed in existing buildings as part of renovation projects. It is an effective way to improve the thermal performance and moisture control of older buildings especially if you are not sure how the existing insulation is constructed.
Is AN INTELLIGENT VCL environmentally friendly?
Many types of intelligent VCL’s are environmentally friendly, made from recyclable materials and designed to reduce a building’s carbon footprint. By improving energy efficiency, it contributes to lower CO2 emissions. However, environmental friendliness can vary depending on the specific products and materials, so it is advisable to look for options that are certified for sustainability.
How does Climate membrane affect indoor air quality?
 An Intelligent VCL can have a positive impact on indoor air quality by helping to regulate humidity levels, which can reduce mold growth and the accumulation of pollutants. Well-regulated humidity contributes to a healthier living environment and reduces the risk of respiratory problems.
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