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OMEGA UDOs 330 Roof Underlay

OMEGA UDOs 330 Roof Underlay
Vapour open (vapour permeable), weldable roof underlay for very flat underroofs. Prefabricated customisation possible
  • UV STABILITY FOR 5 MONTHS
  • USE FOR ROOF PITCHES STARTING FROM 1,5°
  • EMBOSSED SURFACE

Available dimensions

Article number Type Roll width Roll length Rolls / Pallet Total area Inquiry List
2OMSTG Standard 1.5 m 30 m 40 rolls 1800 m²
2OMST3G Standard 3 m 30 m 20 rolls 1800 m²
2OMSTV

Field of application

  • for vented pitched roofs
  • minimum roof pitch 1,5°
  • for installation directly on the thermal insulation / wood sheathing

Advantages

  • embossed surface
  • rain-tight
  • air-tight
  • five months UV light-resistant
  • can be welded
  • water-tight
  • easily cut

Product data

Is a vapour permeable roof underlay for installation directly on the thermal insulation or the wood sheathing. The underlay can be welded on the joints. The roof underlay is suitable for roofs with increased need for rain-tightness (because of small roof pitch for example). According to German classification it is UDB-A . The membrane guarantees extreme resistance against wind-driven rain while humidity in form of vapour still can pass the construction. Increased raintightness proved by Holzforschung Austria. (Report no. : 1158/2014-BB)
Material composition
PES fleece with TPU layer on both sides
Thickness
≥
Thickness
0.75 mm
Colour
Light grey
Weight
330 g/m²
Weight per unit area
(+ 5%)
sd-value
0.18 m
sd-value
(± 0,04)
Temperature resistance
-40 °C
Temperature resistance
100 °C
UV-resistance
5 months
Resistance to water flow
W1
Resistance to water flow
EN 1928
Elongation - lengthwise
40 % (± 10)
Elongation - crosswise
50 % (± 10)
Elongation
EN 12311-1
Tensile strength - lengthwise
300 (± 30) N/50 mm
Tensile strength - crosswise
350 (± 30) N/50 mm
Tensile strength
EN 12311 - 1
Tear propagation resistance - lengthwise
260 (± 30) N
Tear propagation resistance - crosswise
240 (± 30) N
Tear propagation resistance
EN 12310-1
Storage
Cool and dry
Fire performance
E
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.
Glue all overlaps/connections with OMEGA N55 adhesive, or weld using a heat gun or OMEGA QSM solvent welding agent.
(1) UNDERLAY (unsupported)

(2) Underlay (supported)

OMEGA UDOs 330 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 N55 Adhesive or to weld using hot air gun. For the raintight version (temporary cover) a nail-seal under the counter batten (OMEGA NDB Nail Sealing Tape DSK) is necessary.
In accordance with the SIA standard 232, the ZVDH data sheet and ÖNORM B 4119, in case of increased requirements, the counter-battens must always be sealed with Isocell nail seals, e.g. with the OMEGA Nail Sealing Tape or, from a roof pitch of ≥ 5°, with the PE NDB Nail Sealing Tape DSK. The use of corrosion-resistant fasteners is recommended.
(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.
(3) EAVES CONSTRUCTION

(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.
(4) RIDGE AREA

(5) VALLEY INFORMATION

The first step in valley formation is to lay a continuous valley blanket.
(5) VALLEY INFORMATION

(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 minimum joint width must be 4 cm according to ÖNORM B 4119.
The roof underlay does not replace roof covering. The roofing membrane is to be fixed with battens. In general, cross joints and lock seams are to be avoided.
Welding temperature approx. 260 to 280 °C, depending on the ambient temperature. (Test welding is recommended).
Please note the guidelines for installation of the OMEGA UDOs 330 Roof Underlay!
(6) PENETRATIONS

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