The debate on the sustainability of concrete as a building material rages on, shaped by interest groups from the construction industry to climate activists. With over 1600 completed projects, Felix Sommer and his team at Berlin-based company SB5ÜNF are one of Germany's best-known experts specializing in concrete repairs, maintenance, and renovation. His engaging stories provide an insight into spectacular building projects, into perfecting the craftsmanship, and into cooperating equitably with all parties involved in a project. This lavishly designed volume offers an extraordinary perspective that enriches the conversation around one of modernism's most impactful construction materials.