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OMEGA MONO 200 Roof Underlay

OMEGA MONO 200 Roof Underlay
A vapour permeable roof underlay for installation directly onto the face of the thermal insulation or wood sheathing. Monolitic membrane.
  • UV-stable and tight against driving rain

Available dimensions

Article number Type Roll width Roll length Rolls / Pallet Total area Inquiry List
2MONO200 Standard 1.5 m 50 m 20 rolls 1500 m²
2MONO200W SK DUO 1.5 m 50 m 20 rolls 1500 m²

Field of application

  • for vented pitched roofs
  • high quality protection for wood and insulation
  • for installation directly on thermal insulation or wood sheathing


  • rain-tight, wind-tight
  • 12 weeks UV-stability
  • water-tight
  • easy to cut
  • non-glare

Product data

is a non-vapour retardant roof underlay with two two-way acrylate adhesive strips for installation directly on the thermal insulation or the wood sheathing. The monolithic membrane guarantees high UVresistance and extremely high resistance to the penetration of rain. Vapour transmission through the functional film is no longer a result of capillary conduction but transport is active from the interior to the exterior through the non-porous membrane. Water-tightness and UV-resistance are therefore retained even under the influence of wood preservative, chain saw oil or resin.
Material composition
monolithic membrane with PP fleece on both sides and two-way acrylate adhesive strips
0.7 mm
200 g/m²
0.1 m
Temperature resistance
-40 °C
Temperature resistance
80 °C
Temperature resistance
(short-term 100 °C)
12 weeks
Resistance to water flow
Resistance to water flow
EN 1928
Elongation - lengthwise
63 (-3 / +57) %
Elongation - crosswise
71 (-11 / +49) %
EN 12311-1
Tensile strength - lengthwise
360 (-60 / +90) N / 50 mm
Tensile strength - crosswise
280 (-50 / +120) N / 50 mm
Tensile strength
EN 12311 - 1
Tear propagation resistance - lengthwise
215 (-35 / +135) N
Tear propagation resistance - crosswise
240 (-40 / +110) N
Tear propagation resistance
EN 12310-1
cool and dry
Fire performance
Fire performance
EN 13501_1 / EN 11925_2

Processing guideline

(1) UNDERLAY (unsupported)

OMEGA roof Underlay is nailed parallel to the eaves with a slight drape and laid and mechanically fixed above the rafters. Vertical overlaps/joins must always lie on a rafter.
All overlaps must be bonded with OMEGA QUILLI Sealing Compound. Horizontal underlay panels can be joined using SK DUO adhesion as provided or with OMEGA QUILLI Sealing Compound (no pressure need be applied).
(1) UNDERLAY (unsupported)

(2) UNDERLAY (supported)

OMEGA roof underlay is laid on sheathing parallel to the eaves. The blankets are fixed with concealed nails spaced at 10 cm at the ridge-side edges (marks at edge). All overlaps/joins must be bonded with OMEGA QUILLI Sealing Compound (without applying pressure) or the integrated adhesive strips (applying adequate pressure). For the raintight version (temporary cover) a nail-seal under the counter batten (OMEGA QUILLI Sealing Compound or OMEGA NDB Nail Sealing Tape ) is necessary. The single-sided nail-seal tape must be attached to the roof underlay directly beneath the counter batten!
(2) UNDERLAY (supported)


We recommend an eaves construction with drainage below the gutter so that snowmelt build-up can easily drain off. We recommend the use of a metal sheet to drain off water.


The ridge area is closed directly when covered with OMEGA roof underlay. This provides immediate protection against water penetration. In non-insulated lofts and/or ventilated interior insulation the ridge formation must be made open: the blankets end 3 cm before the ridge apex, counter battens are mounted and a
50 cm wide strip of OMEGA roof underlay must be attached over the roof apex.


The first step in valley formation is to lay a continuous valley blanket.


Sections cut out for roof penetrations (extractor pipes, roof windows, chimneys, etc.) should be kept as small as possible and the ends of the sheets must be fixed so that no rain or snow can penetrate. To achieve a perfect seal the suitable adhesive technology by ISOCELL GmbH & Co KG must be used.
Make sure that the substrate is clean! The manufacturer can accept no liability for mechanical damage. The applicable regulations and guidelines (e.g. of the ZVDH (Central Association of German Roofers) for Germany, Austrian Standard, ÖNORM B 4119, for Austria, ...) must be observed!
The roof underlay does not replace roof covering. The roof must be covered during the period of the specified weathering time. Early covering has a positive effect on the resistance to ageing.