STEICOmulti membra 5

Vapour control layer

Vapour control layer for airtight internal use

  • Particularly robust and flexible
  • Highly tear-resistant
  • Permeable, sd value 5 m
  • Suitable for air-injected insulation and insulation batts
  • Suitable for sub and top installation when sufficient insulation covering is provided by STEICO wood fibre sarking boards


Production and designation EN 13984: 2013
Fire class (RTF) according to EN 13501-1 E
Area weight [g/cm²] 130
sd value [m] 5,00
Temperature resistance [°C] -40 to +80
UV protection in non-installed state 3 Months
Max. tensile force longitudinal 350
Max. tensile force transverse 350
Elongation at Max. tensile force longitudinal [%] 20
Elongation at Max. tensile force transverse [%] 20
Tear resistance longitudinal [N] 270
Tear resistance transverse [N] 270


Length [mm]

Width [mm]

Area/roll [m²] Area/pal. Net [m²] Number/pal. [pcs.]
50000 1500 75 1500,000 20
50000 1500 75 1500,000 20
50000 3000 150 3000,000 20
50000 3000 150 3000,000 20

Processing STEICOmulti membra 5

  • Lay the membrane or sheet so that the printed side is facing the fitter
  • Lay the sheet parallel or at a right angle to the rafters wirh an overlap of at least 10 cm
  • Ensure flush-processed bay insulation. There may be no cavities between the bay insulation and sheet/membrane. Visual check thanks to translucent character
  • Fit the membrane or sheet in a tension-free manner and avoid creases
  • Overlaps, component joints and penetrations must be made in an airtight manner by means of STEICO system accessories
  • Additional mechanical fastening (e.g. battens) must be used immediately after installation to support the weight of the insulation

Processing in case of air-injected insulation:

  • The distance between the clips to be used for fixing the vapour barrier in place on the supporting structure is max. 10 cm
  • The use of STEICO fibreboard strips or an additional lath along the rafter is recommended as an alternative
  • Before the introduction of the air-injected insulation, cross lathing must be arranged with a max. centre distance of 420 mm
  • Once the insulation has been injected, seal the injection holes in an airthight manner using STEICOmulti tape P stickers

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

Declaration of performance