Features and Benefits

1-component silicone-rubber thick coating for waterproofing roofs


  • UV-resistant and weatherproof
  • Water vapor permeable
  • Permanently flexible at low temperatures
  • Sprayable
  • Easy cleaning of tools with water
  • Amount required (depending on type of use): 1.3 kg/m2 per mm (wet)

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Ceresit CP 30 is a solvent-free, ready-to-use silicone rubber emulsion for the seamless and crack-bridging surface protection and waterproofing of roof areas. Certified as a waterproofing coating in compliance with ETAG-005. Especially suited for the reconstruction and repair of leaks, roof connections and pipe penetrations. CP 30 can be applied on mineral and bitumen substrates, acrylic roof coatings, metals, plastics, thermal insulation layers and wooded materials. It is also suitable for zero slope roofs if used with a dry layer thickness of at least 2 mm. It remains resistant to diluted acids and alkaline only when exposed to them for a short time.
Certified as a waterproofing coating according to ETAG-005

Step by step

Substrate preparation

The substrate must be sound, clean, free of dust and grease as well as dry or only slightly damp (max. 5 % residual moisture). Mechanically remove moss, algae and lichen as well as loose particles and coatings.

When using Ceresit CP 30 Aquablock Coating on still tight roofs only as a protection layer against UV radiation and weathering, a wet layer of 1.0–1.5 mm thickness is sufficient. The seams and joints of bituminous roofing membranes or fiber cement boards must first be covered with CP 30 Aquablock Coating. The final coat can be applied after a drying time of 10–12 hours, or longer depending on the weather.

Sealing coat When using CP 30 Aquablock Coating for waterproofing ac - cording to the requirements of ETA, it is necessary to apply two layers with CP 28 Aquablock Vlies embedded into the first layer. The first layer is applied onto the pre pared and, if necessary, primed substrate with a wet layer thickness of 1 mm. CP 28 Aquablock Vlies should then be rolled and pressed into the freshly coated surface, free of blisters and folds, with an overlap of 10 cm. Always align the over - lapping seams in the direction of water flow. Apply only as much CP 30 Aquablock Coating as can be covered with CP 28 Aquablock Vlies before a start of skin formation. Soak a short-pile roller in CP 30 Aquablock Coating and roll the fleece down into the first coat so that it is fully embedded. Wait until the first layer has fully dried (waiting time approx. 24 hours, sometimes longer depending on the weather) before applying the second coat. Check whether the coat is ready for foot traffic.

Roof inspection and Maintenance: After complete drying of the applied waterproofing coat, it is possible to install additional walkways on the surface with the help of CP 30 Aquablock Coating top coat. It is recommended to use a contrasting color for these areas and a layer thick ness of 1.0 mm. Sprinkle quartz sand (e.g. grit 0.1– 0.4 mm) into the fresh top coat of the service walkways to prevent slipping.