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Roof waterproofing solutions

For long-lasting protection, you need a sound solution. But it can be difficult to choose between an acrylic waterproofing coating and other products on the market, such as silicone-rubber based coating. Our guide will help you make an informed decision and provides step by step instructions for acrylic based waterproofing.

Man Applying Waterproofing on Roof

What’s your roof solution? Should you choose acrylic waterproofing or silicone-rubber? We’ve got the answers!


Whether you’re building a new roof or repairing an existing one, waterproofing is an essential stage. The solution you choose will determine the overall resistance and longevity of the roof. By selecting the best product and method of application, you can prevent the need for costly, time-consuming repair work in the future.
Acrylic polymer waterproofing coating and silicone waterproofing coating both provide excellent long-term protection. Here’s what you need to know about the main properties of both products:

  • Acrylic waterproofing: cost-effective, UV resistant and resilient, acrylic based waterproofing is a popular choice for roofs. Acrylic is very easy to apply, and the coating maintains its fresh white sheen for years. There are also environmental advantages – they’re low odour and low VOC. On the downside, they’re less resistant when it comes to ponding water, and the coating can become brittle over time. Acrylic waterproofing coating cannot be applied in temperatures below 10 °C.
  • Silicone-rubber waterproofing: flexible, durable and UV resistant. Silicone can cope with extreme temperatures and weather, and is able withstand ponding water. The coating is thick, which means that one layer is often sufficient, saving time and work. It can be applied in low temperatures and retains its flexibility. On the other hand, over time silicone can attract dirt and turn yellow.
waterproofing roof, silicone waterproofing, acrylic waterproofing

Polycryl is an easy-to-use acrylic waterproofing coating.


If you’re looking for a roof waterproofing solution that is easy to use and withstands both UV radiation and moisture, opt for Henkel Polybit’s Polycryl acrylic based waterproofing coating. This acrylic waterproofing coating is ideally suited for roofs, terraces, balconies and patios. It is also environmentally friendly due to its low VOC.
Before you use Polycryl, keep this in mind:

  • Polycryl forms a protective coating on concrete structures and plastered surfaces, as well as cement render.
  • When working with Polycryl, make sure to wear protective clothing like gloves and safety goggles.
  • Diluted with water, Polycryl can be used as a primer as well.
  • Store the product in temperatures under 25 °C.


Did you know? When waterproofing polyurethane foam on roof applications, Polybit Polycryl PF has got you covered. This acrylic waterproofing and protective coating forms a flexible and durable bond that is resistant to UV rays and other weather conditions.

Here’s how to use Polycryl acrylic coating for waterproofing:

  1. Prepare the substrate. The substrate must be completely clean and drydefects should be repaired using a suitable repair mortar. Substrate preparation will depend on the material.
  2. For vertical surfaces, pre-treating with a primer is recommended. Dilute Polycryl 1 to 1 with water to use the coating as a primer. For more detailed guidance, refer to the Technical Data Sheet (TDS).
  3. Apply the first layer of Polycryl acrylic coating. If you use a priming coat, wait for this to dry completely before applying Polycryl. You can use a roller, paint brush or spray.
  4. Apply a suitable membrane for reinforcement (Polybit CL 252) in joints and corners. Press the membrane onto the freshly coated surface, making sure the layer is smooth. Using a roller, cover the fleece with a layer of Polycryl, so it is completely embedded.
  5. Apply the second layer of Polycryl. Allow to fully dry for 72 hours. For roof applications, make sure dry film thickness is at least 1.5mm.

You can also use Polybit Polytherm AC for this type of application. This flexible acrylic waterproofing coating keeps roofs cooler in hot temperatures due to its high emittance and reflectance, combined with a low thermal conductivity.

Waterproof and Weatherproof!

For enhanced protection, check out Henkel Polybit’s waterproofing range, with specialised products designed to offer long-lasting protection from moisture.

  • Waterproofing Solutions

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