Hydrosafe® vapour retarder made of building paper


  • Excellent protection against damage to structures and mould thanks to humidity-variable diffusion resistance
  • Protected winter building sites thanks to hydrosafe® behaviour
  • Can be combined with all fibrous insulation materials (including blown-in insulation)
  • Ecological solution for sealing of the building envelope
  • Excellent values in the hazardous substance test, has been tested according to the ISO 16000 evaluation scheme

Areas of Application

For use on roofs, walls, ceilings and floors in combination with all fibrous insulation materials, including blown-in insulation, on structures that are open or closed to diffusion on the exterior, after appropriate design calculations.

Installation instructions

General conditions

pro clima DB+ can be laid with the printed or unprinted side facing the installer, along or at a right angle to the sub-structure, for example, the rafters. It must not be laid and stretched tight.
If laid horizontally (at right angles to the sub-structure) then the maximum space permitted between the rafters is 1 m (3 ft). After laying, it is necessary to support the weight of the insulation with lathing on the inside. The laths should be no more than 65 cm (2' 2") apart. If, when using insulation mats and boards, for example, you expect tension as a result of the insulation weight on the adhesive tape joins, an additional supporting lath should be placed on the overlap. Alternatively, the adhesive tape can be reinforced along the overlap by sticking strips of adhesive tape at right angles to the overlap every 30 cm (1 ft).

Airtight seals can only be achieved on vapour control membranes that have been laid without folds or creases. Ventilate regularly to prevent excessive humidity (e.g. during the construction phase). Occasional rush/inrush ventilation is not adequate to quickly evacuate large amounts of construction-related humidity from the building. Use a dryer if necessary.

To prevent condensation, DB+ should be stuck down so that it is airtight immediately after installing the thermal insulation. This particularly applies when working in winter.

Additionally for blown-in insulation
DB+ can also be used as a membrane for all types of blown-in insulation. Its reinforcing layer prevents tearing when blowing in the insulation. If laid along the sub-structure it has the advantage that the overlap is supported on a firm foundation and is therefore protected.
To prevent condensation, the blown-in insulation should be introduced immediately after installing the airproofing layer. This particularly applies when working in winter.

De­clar­a­tion of Per­form­ance (DoP)