Bouwplast-plus panels have a unique watertight click connection. This is because the top of the panel is fitted with a double-sided, rubber sealing strip so that an almost seamless joint is formed. This means that dirt, sand and any other contamination has little chance of becoming stuck on and due to the smoothness of the material, water also runs off very rapidly. The panels do not have to be grouted or sealed. Simply click them together - that's al there is to it!