Weâre Neuchâtel. We help architects and construction professionals protect their buildings with advanced, durable structural waterproofing systems. From Neuchâtel Mastic Asphalt to technical waterproofing membranes, for cold, warm or green roofs, floors, walls, paving and carparks, Neuchâtel has a proven solution for the entire building envelope. Our products are designed and engineered to handle New Zealandâs unique conditions, high rainfall, and the ongoing challenges of climate change.