Hydrosafe® high-performance vapour check for exterior roof insulation

connect variant with self-adhesive zones


  • Best possible protection against moisture damage to structures thanks to humidity-variable diffusion resistance
  • Protects buildings against the elements during the construction phase for roof pitches of 10° (2.1:12) and higher
  • Protected winter building sites thanks to Hydrosafe® behaviour
  • Water-resistant and waterproof, can be walked on
  • Excellent values in hazardous substance testing, has been tested according to the ISO 16000 evaluation scheme

Areas of application

For use as a vapour check and airtight membrane that can be subjected to outdoor exposure on roof decking underneath over-rafter insulation in combination with all fibrous insulation materials on structures that are open or closed to diffusion on the exterior, e.g. flat/steep roofs and green roofs, after appropriate design calculations have been carried out.

Planning and installation instructions

Areas of application

The high-performance pro clima INTESANA vapour check that can be subjected to outdoor exposure with a humidity-variable sd value (g value; US perms) can be used:

  • On roof decking, underneath over-rafter insulation,
  • As a membrane that can be walked on, even underneath insulation layers in indoor areas - e.g. floor underneath 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, the INTESANA system 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 the pro clima Engineering Hotline.

2 months of outdoor exposure

pro clima INTESANA 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 INTESANA 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.

Increased indoor humidity

INTESANA 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 (4' 11") and < 2.5 m (8' 2") comes from DIN 68800-2 and is described in further detail by the 70/1.5 rule. INTESANA 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 contrast with the case of membrane installation on the interior, quality checking using the differential pressure procedure (e.g. using BlowerDoor) is only possible with overpressure for membrane installation on the exterior. In this case, fog must be generated in the interior of the building using a fog machine. The airtightness of detail features can then be checked 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 as part of external roof insulation – is particularly important.


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