Heavy-weight roof underlay, with self-adhesive zones

Variant without self-adhesive zones


  • Maximal flexibility in planning construction schedules thanks to 6 months of outdoor exposure
  • 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
  • Reliable during the construction phase: suitable for temporary coverings during construction work
  • Quick and reliable adhesion thanks to the integrated ‘connect’ self-adhesive zones along the membrane strips

Areas of Application

For use as a permeable sarking or roof underlay on roof decking, MDF and wood fibre underlay panels, and on all thermal insulation materials.

Planning and construction guidelines

Area of application

Membranes in the SOLITEX MENTO family can be used as both underlay and sarking membranes.
They stop cold air from flowing through the building structure and ensure that the thermal insulation works in an optimal manner.
With its extremely high level of watertightness and high stability, the SOLITEX MENTO family can also be used as a temporary covering.
They are suitable as an additional measure for rainproofing as sarking membranes when covering a roof with roofing tiles with simple overlapping.
When used as an underlay membrane with simple overlapping on wooden decking, SOLITEX MENTO membranes are suitable as an additional measure for rainproofing even in the case of more demanding requirements.

Use as a temporary covering

SOLITEX MENTO membranes can be used as temporary covering for up to 6 months to protect the building structure during the construction phase.
The minimum pitch for the use of SOLITEX MENTO membranes is stipulated by national regulations in certain cases. For further information, please contact the pro clima partner in the country where the membranes are to be used.
System adhesive tapes and adhesives should be used to stick overlaps and joints.

  • The connect variants have two self-adhesive zones for reliable exterior sealing.

Dark marks may form on the membrane as a result of rainwater. These have no influence on the high level of watertightness and the effectiveness of the interior membrane.

No rear ventilation is necessary

No rear ventilation is necessary thanks to the high diffusion permeability of pro clima SOLITEX MENTO, rear ventilation of insulation is not required.
The membrane can be applied directly onto the thermal insulation in all cases, i.e. the insulation thickness can be equal to the full height of the rafters.
In the case of non-insulated attics, it is advantageous to provide hip ridge ventilation in order to ventilate the attic space.
Complicated and often ineffective aeration and ventilation details at the eaves, ridge, valley, hip and additional roof features are thus unnecessary.

Maximum diffusion permeability

Moisture can dry out of the structure to the outside more easily and more quickly.
This is advantageous both during the construction phase (when construction timber may be moist) and during normal use (when moisture from indoor air penetrates into the structure by diffusion or convection).
As a rule, moisture due to construction work should be able to escape the building quickly by ventilation through open windows. Dryers can help to speed up the drying process in wintertime.
This helps to avoid permanently high levels of relative humidity.

No tent effect

The pore-free SOLITEX membrane offers particularly good protection against driving rain. Membranes in the SOLITEX MENTO family can be installed directly on top of insulation materials or roof decking. A tent effect is reliably prevented by the monolithic membrane and the multi-layer structure.
The term ‘tent effect’ refers to the phenomenon that watertight tent sheets cause the entry of large amounts of moisture into building components at their points of contact.

Retrofitting underlays

Insufficient roof linings can be rectified internally by retrofitting SOLITEX MENTO roof lining membranes.

In cases where there were previously no underlays, these can be retrofitted using SOLITEX MENTO roof underlays.
SOLITEX MENTO membranes provide optimal protection for the insulation structure thanks to the new technology of pore-free membranes. They are highly permeable and, at the same time, particularly resistant to driving rain, tear-resistant and insensitive to wood preservatives.
SOLITEX MENTO 1000 and 3000 can be combined with all mat-shaped and panel-shaped insulation materials.

Installation and fastening

The SOLITEX MENTO family is installed with the dark grey covering fleece side (printed side) facing outwards.
The membranes can be installed taut parallel or perpendicular to the eave. Horizontal installation (perpendicular to the eave) is preferable with regard to water flow paths during the construction phase.
When the product is used as a sarking membrane, the rafter spacing is limited to 1 m (3 ft).
Use clout nails or fastening staples that are at least 10 mm (3/8") wide and 8 mm (5/16") long to attach the membranes.
The membranes can only be fastened with staples in the protected overlap area. The maximum distance between fasteners is 10 to 15 cm (4" to 6"). Allow for an overlap of at least 10 cm (4") between the membranes. A larger overlap is recommended if the roof slope is less than the critical roof slope.

Approval and composition

The special membranes in the SOLITEX MENTO family are made of a thermoplastic elastomer ether-ester; the protective and covering fleeces are made of polypropylene.

All SOLITEX MENTO membranes have been tested in accordance with the requirements of EN 13859-1.
They have the CE label.

Technical hotline

If you have questions on applications, please contact the technical-support.