New Zealand Distributors for Wienerberger products including, Porotherm clay construction block, Koramic clay roofing tiles, Terca clay facing bricks, Argeton clay facing tiles & Penter clay pavers. STELLARIA NZ is taking an innovative approach to bring about a welcome change within the New Zealand building industry and the world of architectural design by promoting the use of Wienerberger construction materials for both residential and commercial use.