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Expansion joint material

Neodyl is a joint bridging waterproofing material used for the treatment of expansion joints on flat roofs of buildings. Neodyl is made from synthetic rubber. It is compatible with conventional built-up roofing, elastomeric modified bitumen membranes and mastic asphalt.

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Fields of Application

Neodyl is intended for the waterproofing of expansion joints of:

  • Parking decks
  • Flat roofs


  • Long durability
  • Rot proof
  • Excellent pliability
  • High resistance to shearing and to aging
  • Easy to apply
  • Compatible with any type of substrate


The minimum width of Neodyl is to be 250 mm.

Neodyl must always be adhered to the substrate on either side
of the pleat. It is secured by torch-on fusion onto a base layer
(Derbigum SP) which itself is adhered by fusion to the previously
primed concrete.

Attention must be given during fixing to ensure the Neodyl
strip has a sufficiently deep inverted pleat so that it will not be
extended when the joint is in the maximum opening position.


Technical Data

Roll 10 m x 250 mm
Thickness (nominal) 5 mm
Mass (nominal) 12 kg
Elastomeric modified bitumen 4,1 kg/m2
Neoprene coated glass cloth 0,4 kg/m2
Heat Flow ≤ 2 mm (90 °C/2h)
Modulus at 100% 90 DaN/cm2
Thermal Stability 1 mm per metre at +80 °C
Heat Resistance Continuously from -50 °C
to +80 °C
Tensile strength Length 60 DaN/cm
Tensile strength Width 40 DaN/cm
Tearing resistance at 20 °C No tearing after 1000%
Stretch to break Length 5%
Stretch to break Width 3%
Cold Flexibility -25° C
Elasticity Rage 100%
Static Puncturing on Polystyrene
(NFP 84 352)
>14 kg

Specifications are subject to change without notification. Results shown are typical but reflect test procedures used. Actual field performance will depend on installation methods and site conditions.

Download Data Sheet

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