39 problems carry building and unbuilding

Construction problems follow a building's whole life: 3D-printed concrete walls built during the cement's dormant period with no way to measure the material as it goes up — and zero provisions for them in U.S. building codes; demolition crews facing insulation that is safe and remeltable if installed after the late 1990s but possibly carcinogenic if older; Europe tearing out 1.5 million tonnes of window glass a year of which about five percent ever becomes new glass.