Reinforced all-round hydrosafe® high-performance vapour check


  • Excellent protection against mould and moisture damage to structures thanks to humidity-variable diffusion resistance
  • Can be combined with all fibrous insulation materials
  • Easier handling: can be used with insulation installed between rafters or wall framework and with exterior insulation
  • Protects building structure against weathering during the construction phase for roof pitches of 10° (2.1:12) and higher
  • Protected winter building sites thanks to hydrosafe® behaviour
  • Excellent values in hazardous substance testing, has been tested according to the ISO 16000 evaluation scheme

Areas of application

For use on the inside of insulation installed between rafters or wall framework, or over a hard subsurface for use underneath exterior insulation in combination with all fibrous insulation materials – including blown-in insulation materials. This membrane can be permanently exposed to diffuse UV light – e.g. in unconverted spaces without inner cladding. It can be used on building components that are diffusion-open to the outside or are diffusion-tight, e.g. pitched, flat or green roofs, after appropriate design calculations have been carried out.

Planning and installation instructions

Areas of application

The high-performance INTELLO X PLUS vapour check, which can be subjected to outdoor exposure and has a humidity-variable sd value (g value; US perms), can be used:

  • On the inside of supporting structures – even in areas where the membrane will be permanently exposed to diffuse UV light, such as areas without inner cladding
  • On decking, underneath exterior insulation
  • As a membrane that can be walked on, even underneath insulation layers on hard subsurfaces such as decking – e.g. on the floor of a cold attic
  • On residential buildings or commercial buildings with residential-like use in all rooms such as living rooms, bedrooms, kitchens and bathrooms
  • On structures open to diffusion on the exterior and those that are closed to diffusion on the exterior

Use even on structures with demanding construction physics conditions

Compared to other products on the global marketplace, INTELLO X PLUS also provides excellent protection against moisture damage to structures – even for locations with very cold climates – for critical structures that are closed to diffusion on the exterior, such as pitched roofs with metal coverings, roof linings with asphalt roof membranes, flat roofs and green roofs etc.

Please note that the task of providing moisture protection forms part of the construction design and verification process. For further information in this regard, please contact our Technical Support.

2 months of outdoor exposure

pro clima INTELLO X PLUS can be subjected to outdoor exposure for up to 2 months to protect the building structure.

The minimum roof pitch is 10° (2.1:12).
Please note that INTELLO X PLUS does not provide sealing that is equivalent to an emergency roof. Moisture can enter at staples or other perforations (nails, screws etc.). In addition, covering with tarpaulins is recommended for buildings that people are living in or that are particularly worthy of protection.

Use of fibrous insulation materials

The high degree of protection against moisture damage to structures offered by humidity-variable vapour checks is achieved by using fibrous thermal insulation materials that are open to diffusion, as the moisture must be able to diffuse through to the vapour check for the purpose of drying during the summer climate.

Fibrous thermal insulation materials such as cellulose, flax, hemp, wood fibre and rock or mineral wool are ideal here.

Use of diffusion-open interior cladding

To take full advantage of the potential of humidity-variable vapour checks to provide protection against moisture damage to structures, diffusion-open cladding should be installed internally relative to the vapour check – e.g. gypsum boards or wooden board cladding.

Areas without inner cladding

The airtightness and windtightness layer is one of the most important functional layers on thermally insulated structures. For this reason, these layers need to be protected against potentially damaging influences such as mechanical stresses and UV radiation. The German standard DIN 68800-2 stipulates that UV-resistant layers should be installed within a period of 3 months if no separate certification of service life is available.

The membranes in the pro clima INTELLO X family of products provide an increased level of UV protection thanks to their protective and covering fleece on both sides. They can be left uncovered permanently in the case of diffuse UV radiation.

This does not apply to areas with strong direct UV radiation, e.g. the window reveals of skylights in unconverted attics. These and other comparable areas should be protected within 18 months of installation by means of a UV-resistant covering (e.g. plasterboard).

Increased indoor humidity

INTELLO X PLUS has been designed in such a way that a reliable vapour-checking effect is ensured even in the case of increased indoor humidity for limited periods, which can occur in new buildings as a result of construction work or during short-term increases in relative humidity in bathrooms or kitchens, for example.

Construction phase: Hydrosafe® value (70/1.5 rule)

A vapour check should have a hydrosafe® value of 1.5 m in order to protect structures against dampness even in the case of the increased relative humidity that can be present during construction work. The hydrosafe® value specifies how well sealed a humidity-variable vapour check still is at an average humidity of 70% (e.g. at 90% indoor air humidity and 50% humidity in the space between the rafters) – these values can be achieved when screed is being installed or walls are being plastered.

The requirement that sd should be > 1.5 m and < 2.5 m comes from DIN 68800-2 and is described in further detail by the 70/1.5 rule. INTELLO X PLUS fulfils these requirements reliably.

Regardless of the type of vapour check used, moisture due to construction work must always be removed from the building structure quickly by ventilation through open windows so that a normal moisture level can be achieved. Dryers can help to speed up the drying process in wintertime.

Quality assurance

In the case of membrane installation on the exterior, efficient quality assurance can be carried out during the course of construction by means of differential pressure testing with overpressure and artificial fog. As part of this testing, fog is generated inside the building using a fog machine. In this way, the airtightness of detail features can be checked and rectified on the exterior. The membranes must be mechanically secured to a sufficient extent beforehand. For this reason, adhesive bonds and joints are to be implemented with particular care.

Detailed construction planning – particularly of joints at the eaves and gable ends and the implementation of these joints on roof refurbishment projects – is particularly important. In Germany, this quality assurance during the course of construction is no substitute for final testing of airtightness in accordance with the German Building Energy Act (GebäudeEnergieGesetz, GEG) or the requirements of the German Reconstruction Loan Corporation (KfW) regarding the determination of the air change rate (n50 value).

Technical support

If you have questions on applications, please contact our Technical Support.