Hydrosafe high-performance vapour retarder, suitable for all fibrous insulation mats and boards



  • The best possible protection for insulation structures thanks to humidity-variable diffusion adaptation with a variation of a factor of over 100
  • Test winner in April 2012 with the German product-testing foundation »Stiftung Warentest«
  • Permanent protection: Officially tested and certified performance
  • Protected winter building sites thanks to hydrosafe behaviour
  • Lowest VOC rating in hazardous substance test


Can be used as a vapour check and airtightness membranes for all externally diffusion-open structures, e.g. with roof underlay (pro clima SOLITEX), softwood fibreboard or MDF board. For a high level of protection against moisture induced failures in structurally challanging constructions such as diffusion-resistant flat/pitched roofs. Also suitable in extreme environments such as in high mountain regions. Further information is given in the study “Calculating potential freedom from structural damage of thermal insulation structures in timber-built and steel systems”.

Fleece Polypropylene
Membrane Polyethylene copolymer
Attribute Value Norm
Colour white-transparent
Surface weight 85 ±10 g/m² ; 0.28 ±0.03 oz/ft² EN 1849-2
Thickness 0.25 ±0.05 mm ; 10 ±2 mils EN 1849-2
Water vapor resistance factor µ 30 000 EN 1931
sd-value 7.50 ±0.25 m EN 1931
sd-value humidity variable 0.25 - >25 m EN ISO 12572
g-value 37.50 ±1.25 MN·s/g
g-value humidity variable 1.25 - >125 MN·s/g
Vapor permeance 0.17 US perms ASTM E96-A
Vapor permeance humidity variable < 0.13 - 13 US perms EN ISO 12572
Hydrosafe value (sd) 2 m DIN 68800-2
Surface burning characteristics Class A (Flame Spread 0; Smoke development index 35) ASTM E84
Reaction to fire E EN 13501-1
Airtightness tested EN 12114
Airtightness ≤ 0.004 cfm/ft² ASTM E2178
Tensile strength MD/CD 130 N/5 cm / 105 N/5 cm ; 15 lb/in / 12 lb/in EN 12311-2
Elongation MD/CD 90 % / 90 % EN 12311-2
Nail tear resistance MD/CD 70 N / 70 N ; 16 lbf / 16 lbf EN 12310-1
Artificial ageing by long term passed EN 1296 / EN 1931
Temperature resistance permanent -40 °C to 80 °C ; -40 °F to 176 °F
Thermal conductivity 0.17 W/(m·K) ; 1.18 BTU·in/(h·ft²·F)
National technical approval (DE) Z-9.1-853 DIN 68800-2
CE labelling available EN 13984

General conditions

pro clima INTELLO should be laid with the side with the plastic film (the printed side) facing the installer. They can be laid flat either at right angles to or along the sub-structure (such as the rafters) without sagging. If laid horizontally (at right angles to the sub-structure) then the maximum space permitted between the rafters is 100 cm (3'3"). After laying, it is necessary to support the weight of the insulation with lathing on the inside. The laths should be no more than 50 cm (1'8") 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, INTELLO should be stuck down so that it is airtight immediately after installing the thermal insulation. This particularly applies when working in winter.