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AIRSTOP DIVA Vapour Retarder

AIRSTOP DIVA Vapour Retarder
Moisture-variable vapour retarder for use in the air-tight layer. Functional membrane changes its diffusion resistance depending on the current humidity. See our product data sheet!
  • HIGH SD-VALUE RANGE

Available dimensions

Article number Roll width Roll length Rolls / Pallet Total area Inquiry List
2DIVA3 3 m 100 m 16 rolls 4800 m²
2DIVA320 3.2 m 100 m 16 rolls 5120 m²
2DIVA32 3.2 m 40 m 20 rolls 2560 m²

Field of application

  • flat roofs
  • construction components with permeable and impermeable outer shell in new constructions and refurbishment

Advantages

  • transparent
  • moisture-variable with a very high sd-value range
  • printed cutting line

Product data

Is a moisture-variable vapour retarder for use in the air-tight layer. The functional membrane changes its diffusion resistance depending on the current humidity. During the winter months room atmosphere is generally dryer. The sd-value of the vapour retarder increases. This process results in the penetration of only a little water vapour into the construction and/or into the insulation. In summer, when there is sufficient solar insolation, the relative humidity behind the membrane is higher as a result of reverse diffusion. The water molecules are stored in the membrane. The sd-value sinks, causing more water vapour to escape from the construction and into the rooms and the building element becomes dryer.
Material composition
Fleece composite made of polymers
Colour
Transparent white with blue print
Weight
86 g/m²
Weight per unit area
(± 5 %)
Weight per unit area
ISO 536
sd-value
0.5 m
sd-value
30 m
Temperature resistance
-40 °C
Temperature resistance
80 °C
Elongation - lengthwise
68 %
Elongation - crosswise
79 %
Elongation
EN 12311-2
Tensile strength - lengthwise
180 N / 50 mm
Tensile strength - crosswise
125 N / 50 mm
Tensile strength
EN 12311-2
Tear propagation resistance - lengthwise
140 N
Tear propagation resistance - crosswise
150 N
Tear propagation resistance
EN 12310-1
Storage
Cool and dry

Processing guideline

INFO

Vapour barriers can used with wall, roof and ceiling construction elements as an airtight layer and as a vapour retarding layer.
INFO

(1) MECHANICAL ATTACHMENT OF THE VAPOUR BARRIER

The vapour barrier is usually attached transverse to the position of the rafters, joists or beams with the smooth and/or printed side facing the installer. The lengths are fixed mechanically to the construction’s wood with approx. 10cm overlap using tacking staples. For metal C-studs a temporary attachment using double-sided adhesive tape or even a spray-on contact adhesive is a possibility.
(1) MECHANICAL ATTACHMENT OF THE VAPOUR BARRIER

(2) AIRTIGHT ADHESION

Airtight adhesion of the joints, connections and penetration points must be carried out using the AIRSTOP Adhesion system.
(2) AIRTIGHT ADHESION

(3) TRANSVERSE LATHING / MOUNTED AT INTERVALS

The laths underneath the vapour barrier have to be mounted before the cellulose is blown in. The centre distance shall be less than ≤30 cm. The joints of the vapour barrier also have to be covered by an additional lath. Glued connections and joints that were under tension have to be mechanically secured. The membrane has to be applied without tension.
(3) TRANSVERSE LATHING / MOUNTED AT INTERVALS

(4) LONGITUDINAL LATHING

When no transverse lathing is used, e.g. if formwork is installed on longitudinal lathing, the vapour barrier must be placed parallel to the rafters or to the construction. The joints must lie on the wood of the construction and be stapled overlapping and sealed using AIRSTOP adhesive tape. Before the insulation is blown in the longitudinal lathing must be mounted to provide mechanical relief of the joints.
(4) LONGITUDINAL LATHING