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doitBau® detopp

Tear resistant and highly vapour permeable sarking membrane


This roofing underlay consists of two polypropylene layers and an inner functional membrane. It distinguishes itself by its special tear resistance and is also highly vapour permeable. It is also available as doitBau® detopp SK with acrylic self-adhesive strips.

  • ƒƒAccording to ÖNORM B 4119 and compliant with the latest ZVDH (German Roofer Union) fact sheets UDB-B / USB-A
  • ƒHighly vapour permeable
  • ƒExtremely tear resistant
  • ƒƒDriving rain-proof and draught-proof

Technical data

Material Spunbond polypropylene Natural weathering period 3 months
Composition Three-ply Durability (artificial ageing) Pass
Colour Blue / Black Product Type UDB-B / USB-A compliant with ZVDH
Basis weight 165 g/m² Flammability DIN EN 13501: Class E
Sd-Wert 0,02 m CE marking EN 13859-1:2010
Tear resistance Lengthwise 310 N/5 cm, crosswise 200 N/5 cm Area of Apllication According to ÖNORM B 4119 and ZVDH
Ultimate Elongation Lengthwise 40 %, crosswise 50 % Resistantance to water penetration W1
Resistance to tearing (nail shank) Lengthwise 220 N, crosswise 285 N