VIDEO: A new ordinance in Germantown is aimed at saving firefighter lives. The new rules require buildings with lightweight roofs and floors, which are more prone to collapse, to post signs. It’s a requirement for commercial, industrial and three or more unit buildings. “I am confident that this, these markings, is gonna save firefighter lives,” said Germantown Fire Chief Gary Weiss. Weiss says firefighters will still enter buildings, do rescues and follow normal procedure, but they’ll know they have to do it quicker. Weiss says firefighters are taught they have about 20 minutes inside before the structure becomes unstable, but not if it's a lightweight truss roof. “We're looking at less than 10 minutes,” Weiss said. “So when they arrive and see this sign, it tells them that they don't have a lot of time inside the building.”