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Video, Installation - Anschluss Dachflächenfenster

General conditions

SOLITEX MENTO 3000 is to be installed with the printed side facing the installation technician. It is to be installed as an underlay or sarking membrane horizontally (parallel to the eave) in a taut manner with no sagging. When it is used as a sarking membrane, the rafter spacing is limited to 100 cm (3' 3").

Fasteners should not be applied in areas where water run-off is collected (e.g. in roof valleys).

Ridge ventilation should be provided in the case of non-insulated attics that have not been converted. To do so, install the SOLITEX membrane in such a way that it stops 5 cm before the ridge. In addition, permanent ventilation fittings should be provided in the unconverted attic. The membranes should then be protected against the long-term effect of UV (e.g. by blocking the entrance of light through the windows).

The SOLITEX MENTO 3000 underlay and sarking membrane can be used as temporary covering for up to 4 months to protect the building structure during the construction phase in accordance with the regulations of the Central Association of the German Roofing Trade (ZVDH). The roof pitch must be at least 14°.
The system components TESCON NAIDECK nail sealing tape, ORCON F joint adhesive and TESCON VANA are to be used for bonding of overlaps and joints. The connect variant has two self-adhesive sections for reliable exterior sealing. The specifications in the regulations of the German Roofing Trade are to be taken into account when carrying out installation and adhesion.

In accordance with the regulations, they are suitable as ‘sarking membranes’ for covering a roof with roof tiles and roof stones with simple overlapping as an additional measure for rain protection. When used as an ‘underlay membrane’ with simple overlapping on timber cladding, SOLITEX MENTO 3000 is also suitable as an additional measure for rain protection in the case of more demanding requirements.

SOLITEX MENTO® system - Retrofitting underlay from the inside

In cases where there is no underlay present, underlay can be retrofitted from the inside using one of the SOLITEX underlay and sarking membranes. SOLITEX membranes are equipped with a monolithic, pore-free functional membrane. As a result, they are watertight against water from the outside and can actively transport moisture from the building structure into the open at the same time. This ensures optimal protection for the insulation structure.
If blown-in insulation materials are used, use of the reinforced product variants SOLITEX MENTO PLUS or SOLITEX MENTO ULTRA is recommended.


  • Ensures reliable building components: highly diffusion-open and maximum protection against driving rain
  • Dry building components: pore-free TEEE functional membrane actively transports moisture to the outside
  • Permanent protection thanks to the high resistance to ageing and heat of the TEEE membrane
  • SOLITEX MENTO PLUS / ULTRA: extremely robust thanks to reinforcement: suitable for blown-in insulation materials

Reliable system for installation from the inside

Roof structures without underlay and thus without a counter-batten plane are often encountered on existing buildings. If insulation is to be fitted on these structures, it is recommended to first retrofit an exterior windtightness layer to improve the reliability of the structure.
This measure is recommended for a max. period of 5 years. The roof pitch of the roof tiles must not be less than the standard roof pitch. The roof pitch must be at least 20°. Installation is carried out from the inside, proceeding in turn from one space between rafters to the next. Battens at the corners of the rafters/tile battens allows for the necessary ventilation for the roof covering. A ‘protruding lath’ in the middle of the space between rafters results in a valley in the SOLITEX membrane. In this way, any water that has entered can be drained off to the middle of the area between the rafters (away from the rafters) and towards the eaves.
Attach the SOLITEX membrane to the rafters using battens or DASATOP FIX. The membranes must be overlapped in a waterproof manner and must drain reliably into the open.

Photo gallery: Retrofitting underlay from the inside