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OMEGA MONO 200 Roof Underlay

A vapour permeable roof underlay for installation directly onto the face of the thermal insulation or wood sheathing. Monolithic membrane.

UV-stable and tight against driving rain

Product data sheet

Available dimensions
Product data
Processing guideline
Downloads

OMEGA MONO 200 Roof Underlay

Available dimensions
Product data
Processing guideline
Downloads

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

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Product data

Field of application

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

Advantages

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

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

sd-value

0.15 (±0,1) m

Thickness

0.7 mm

Temperature resistance

-40–80 (short-term 100 °C) °C

Weight

200 g/m²

Colour

Grey

UV-resistance

12 weeks

Resistance to water flow

EN 1928

Elongation - lengthwise

50-80 %

Elongation - crosswise

60-90 %

Elongation

EN 12311-1

Tensile strength - lengthwise

340 (± 40) N/50mm

Tensile strength - crosswise

260 (± 40) N/50mm

Tensile strength

EN 12311 - 1

Tear propagation resistance - lengthwise

210 (± 40) N

Tear propagation resistance - crosswise

280 (± 40) N

Tear propagation resistance

EN 12310-1

Storage

cool and dry

Fire performance

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.