Würth WÜTOP® 150/2SK

Breathable under roof fabric

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WÜTOP® 150/2SK


Breathable under roof fabric

Product code


Highly breathable, watertight roof underlay with wind barrier.‎

Breathable, lightweight, non-slip and highly tear-resistant synthetic membrane, composed of three thermally sealed layers.‎
Top layer: non-woven polypropylene (PP) fabric, non-slip, water-repellent and UV-stabilised.‎
Middle layer: microporous membrane allowing vapour diffusion, watertight.‎
Bottom layer: non-woven polypropylene (PP) fabric.‎
Wind resistance:
- No heat dispersion;
- Energy saving.‎

Thermal insulation protected from accidental infiltration of water and atmospheric agents, which could compromise functionality.‎

Suitably breathable
- Highly permeable to water vapour;
- Expels excess moisture coming from inside the house;
- No condensation formation in the thermal insulation if used in conjunction with a vapour retarder on the hot side (inside).‎

2SK version
- Double-sided adhesive tape built into the overlap area for optimal hermetic sealing;
Avoids the use of additional adhesive tapes to seal the joints.‎

Does not act as the final roof cover.‎
Carefully follow laying instructions.‎
For Wütop 150, watertightness and wind resistance are only guaranteed if the joints are sealed with specific Eurasol® tapes or Wütop WRD adhesive.‎

For direct laying on the cold side of the thermal insulation on pitched and ventilated roofs.‎
For the waterproofing and wind protection of walls.‎

Further details
Laying instructions
  • Wütop® 150/150 2SK roof underlays can be laid directly on the thermal insulation, between the beams or on the wood planking of pitched and ventilated roofs.
  • Begin laying from the bottom and, holding the underlay slightly taut, proceed parallel to the line of the eaves.
  • Attach the underlay to the beams (with discontinuous support) or to the planking (with continuous support) with crimping in the overlap area (marked with a cut-off line) 5 cm from the edge.
  • The next layer should be laid so that it overlaps the previous one by at least 10 cm (see marking on the edge). If the roof is not very steep, the layers should overlap by at least 20 cm. The overlap should always be glued and sealed with adhesive tapes from the Eurasol®, Eurasol® Max, Euradop®range or with Wütop WRD adhesive.
  • Fix the layers in place with counter battens. We recommend applying Eurasol® nail sealing tape under each counter batten to avoid the risk of water infiltration. Fixing with staples only serves as a support during laying. Permanent fixing must always be carried out using counter battens. Anyone mounting underlay without counter battens does so at their own risk!
  • Vertical overlay must be laid over a beam or solid support and must be glued and sealed with tape from the Eurasol® range (see above) or with Wütop® WRD adhesive.
  • At openings or interruptions on the roof (chimneys, skylights etc.), the underlay should be cut and positioned so that it prevents water from infiltrating. Surround the element with the underlay and raise it at the sides, glue and seal the joints with adhesive tapes from the Eurasol® range (see above).
  • Damage such as cuts or cracks must be repaired using pieces of the same underlay glued and sealed with Eurasol® Max adhesive tape. More minor damage can be repaired directly with that same adhesive tape.
  • When laying the underlay, carefully check that it is in perfect condition and that there is no damage of any kind (cuts, abrasions etc.).
  • The final roof cover (tiles) must be laid within a maximum of three months of the underlay being laid, to prevent damage from UV rays.
  • In ventilated roofs, the underlay should always be installed so as to ensure appropriate air flow between the eaves and the peak.
Technical information

Coating weight per m²

150 g

Length of roll

50 m

Roll width

1.5 m


75 m²

Weight of roll

11500 g

Resistance to penetration of water


Resistance to tear propagation (transverse)

270 N

Resistance to tear propagation (longitudinal)

250 N

Transverse tensile force per 50 mm

283 N

Longitudinal tensile force per 50 mm

310 N

Min. temperature resistance

-40 °C

Max. temperature resistance

80 °C

Building material class



Polypropylene - PP

Stretch capacity

70 %

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