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OMEGA MONO 230 Roof Underlay

A non-vapour retardant roof underlay for installation directly on the thermal insulation or the wood sheathing. In accordance with ÖNORM B 4119, the roof underlay is suitable for rainproof under-roofs as well as for under-roofs with increased rainproof properties with a roof pitch of > 15° and a snow load of up to 4.0 kN/m².

UV STABLE AND TIGHT AGAINST DRIVING RAIN

Product data sheet

Available dimensions
Product data
Processing guideline
Downloads

OMEGA MONO 230 Roof Underlay

Available dimensions
Product data
Processing guideline
Downloads

Available dimensions

Article number	Type	Roll width	Roll length	Rolls / Pallet	Total area		Inquiry List
2MONO230SKS	SK DUO	1.5 m	50 m	20 rolls	1500 m²
2MONO230	SK DUO	3 m	50 m	20 rolls	3000 m²

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Product data

Field of application

for vented pitched roofs
for installation directly on the thermal insulation or the wood sheathing

Advantages

raintight
windtight
12 weeks UV-stability
non-glare
watertight
easy to cut

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. In accordance with ÖNORM B 4119, the roof underlay is suitable for rainproof under-roofs as well as for under-roofs with increased rainproof properties with a roof pitch of > 15° and a snow load sk of up to 4.0 kN/m² and complies with the classification UDB-A and USB-A in accordance with the ZVDH Directive (ZVDH = German Central Association of the Roofing Trade).

Material composition

monolithic membrane with PP fleece on both sides and two-way acrylate adhesive strips

sd-value

0.15 (+0,05) m

Thickness

0.75 mm

Temperature resistance

-40–80 °C

Weight

230 (± 10) g/m²

Colour

Lightgrey

UV-resistance

12 weeks

Resistance to water flow

EN 1928

Elongation - lengthwise

80 %

Elongation - crosswise

80 %

Elongation

EN 12311-1

Tensile strength - lengthwise

350 (± 50) N/50mm

Tensile strength - crosswise

250 (±50) N/50mm

Tensile strength

EN 12311 - 1

Tear propagation resistance - lengthwise

350 (±50) N

Tear propagation resistance - crosswise

260 (±40) N

Tear propagation resistance

EN 12310-1

Storage

Cool and dry

Fire performance

EN 13501-1 / EN 11925-0

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).

(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!

(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)

(2) UNDERLAY (supported)

(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.