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OM 240 ND Roof Underlay SK DUO
OM 240 ND Roof Underlay SK DUO
A non-vapour retardant roof underlay for installation directly on the thermal insulation or the wood sheathing.
- 12 weeks uv-resistant
- Water-tight
- Open to diffusion
Available dimensions
| Article number | Type | Roll width | Roll length | Rolls / Pallet | Total area | Inquiry List |
|---|---|---|---|---|---|---|
| 2OM240 | SK DUO | 1.5 m | 50 m | 30 rolls | 2250 m² |
|
Product data
Field of application
- for vented pitched roofs
- for installation directly on thermal insulation or wood sheathing
Advantages
- rain-tight
- wind-tight
- 12 weeks uv-resistant
- anti-glare
- water-tight
- easily cut
Is a vapour permeable roof underlay for installation directly on the thermal insulation or the wood sheathing. Self-sealing behaviour when nailed through on a pressure-resistant substrate. (Perforation-proof according to ETA 25/0019).
- sd-value
- 0.15 (+0,05) m m
- Material composition
- PES special nonwoven with TPU coating
- Elongation (EN 12311-1) lengthwise
- 60 (± 20) %
- Elongation (EN 12311-1) crosswise
- 80 (-20/+30) %
- Tensile strength (EN 12311-1) lengthwise
- 300 (-60/+80) N/50mm
- Tensile strength (EN 12311-1) crosswise
- 360 (-60/+100) N/50mm
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 / connections are to be bonded with the AIRSTOP ULTRA or AIRSTOP FLEX. Horizontal joint bonds must be executed by means of SK-DUO.
(2) Underlay (supported)
The roofing membrane is laid on formwork parallel to the eaves as underlay. The sheets are nailed concealed at the ridge edges at a distance of 10 cm (marking edge). All overlaps/connections must be sealed with AIRSTOP ULTRA, AIRSTOP FLEX or the integrated adhesive strips (with sufficient contact pressure).The perforation protection requires sufficient pressure between the counter batten and the roofing membrane.
(3) Eaves construction
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.
(4) Ridge area
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.
(5) Valley information
The first step in valley formation is to lay a continuous valley blanket.
(6) Penetrations
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.
Instructions
(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 / connections are to be bonded with the AIRSTOP ULTRA or AIRSTOP FLEX. Horizontal joint bonds must be executed by means of SK-DUO.
(2) Underlay (supported)
The roofing membrane is laid on formwork parallel to the eaves as underlay. The sheets are nailed concealed at the ridge edges at a distance of 10 cm (marking edge). All overlaps/connections must be sealed with AIRSTOP ULTRA, AIRSTOP FLEX or the integrated adhesive strips (with sufficient contact pressure).The perforation protection requires sufficient pressure between the counter batten and the roofing membrane.
(3) Eaves construction
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.
(4) Ridge area
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.
(5) Valley information
The first step in valley formation is to lay a continuous valley blanket.
(6) Penetrations
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.
