Highly vapour-permeable airtight membrane

Highly vapour-permable airtight membrane, sarking membrane and roofing underlayment

  • 3-layer, tear-resistant and flexible
  • 2 integrated self-adhesive areas
  • Airtight, highly vapour-permeable and resistant to driving rain
  • Outdoor exposure of up to 3 months possible

Product sheet


Production and designation EN 13859
Fire class (RTF) according to EN 13501-1 E
Area weight [g/cm²] 165
sd value [m] 0,02
Temperature resistance [°C] -40 to +80
Max. tensile force longitudinal 290
Max. tensile force transverse 210
Elongation at Max. tensile force longitudinal [%] 50
Elongation at Max. tensile force transverse [%] 90
Tear resistance longitudinal [N] 220
Tear resistance transverse [N] 280
Resistance to water penetration W1
Seepage resistance after artificial ageing W1
Outdoor exposure 3 Months
Suitable as a temporary roof cover 4 Weeks
Resistance to air penetration [m³/m²] ≤0,04×h according to EN 12114
Minimum roof pitch [°] ≥10 ° depending on the standard roof pitch of the roofing


Length [mm]

Width [mm]

Area/roll [m²] Area/pal. Net [m²] Number/pal. [pcs.]
50000 1500 75 1500,000 20

Processing STEICOmulti UDB

  • Lay the membrane or sheet so that the printed side is facing the fitter
  • Lay the membrane or sheet parallel to the eaves starting with an overlap of at least 10 cm
  • Fix the membrane or sheet in place solely within the overlap area (e.g. clips)
  • Activate the longitudinal self-adhesive areas by removing the protective strip only after the membrane or sheet has beed fixed in place

The following also applies when used as an airtight membrane:

  • Ensure flush-mounted bay insulation (no cavities may exist under the STEICOmulti UDB)
  • Sufficiently thick insulation covering with STEICOspecial/STEICOspecial dry and STEICOuniversal/STEICOuniversal dry must be carried out; for additional details see "Konstruktionsheft Steildach" (inclined roof construction booklet)
  • Component joints and penetrations must be made in an airtight manner by means of STEICO system accessories
  • Additional information can be found in the seperate processing instructions for STEICOmulti UDB

(Please refer to the product data sheet for detailed information)

Declaration of performance

System Recommendations

STEICOmulti tape F

High performance tape with special foil
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STEICOmulti connect

solvent free primer
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STEICOmulti nail

Nail tight tape
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