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Sikalastic-618 is a single component, cold-applied, moisture-triggered polyurethane membrane. It cures to form a seamless, durable and weather-resistant waterproofing solution for exposed roof areas.


  • Single component, ready to use.
  • Easy and quick application of reinforced roofing systems with Sika Reemat.
  • Economic – provides a cost efficient life cycle extension of failing roofs.
  • Seamless membrane based upon moisture-triggered chemistry.
  • Vapour permeable.
  • Retains flexibility at low temperatures.


  • Waterproofing of flat and pitched roof structures.
  • Treatment of new construction and refurbishment of existing structures.
  • Applicable to existing concrete, roofing felt, brickwork.


  • European Technical Approval No. ETA – 12/0316.
  • External fire performance: BRoof (t4) and classification under BS476-3: 2004 EXT.F.AA.

Standard product features

Chemical base:

One-component moisture-triggered aromatic polyurethane.


Chemical resistance:

Sikalastic-618 waterproofing membrane is seen to resist attack from a broad range of dilute acids, alkalis, salt solutions, and organic solvents. In service, this protection is seen to cover exposure to most aggressive environments that may be encountered such as acid rain, traffic pollutants (such as vehicle fumes, petrol, oil, ethylene glycol), sea water, decaying vegetation and industrial atmospheres where higher levels of ground level ozone may be encountered. However, stronger acidic solutions and lower molecular weight alcohols are seen to damage the coating. Accordingly, for applications combining long term roof protection with increased resistance to specific reagents.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-35-50/340 Polyurethane waterproof coatings

NBS Specification

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This product is associated with the following NBS clauses:

Product specification

An important note about specifying



Sika Liquid Plastics


+44 (0)1772 259781

Product reference



[RAL 7009]
[RAL 7011]
[RAL 7045]

Manufacturer details

Sika House,
Miller Street,
Lancashire, PR1 1EA
Tel +44 (0)1772 259781
Fax +44 (0)1772 255670
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