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Tulppa® (Finnish for ‘plug’) is a horizontal-installation wet room insulation board that simultaneously functions as a building board and waterproofing material. The core of the board is closed-cell, waterproof and mould-proof Finnfoam insulation board, while the surface layer is durable special purpose cement mortar. Tulppa-compatible products are available from ARDEX, Casco, SCHÖNOX and Sika.