building and unbuilding

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