The design load of roofs in Aspen, Colo., may provide information about the likelihood of a structure to cave in from snow and alert residents to consult an engineer. Roofs installed after March 1965 were designed with a load of 75 pounds per square foot, as compared to those built before that year, which may be built to carry only 45 to 60 pounds per square foot.
PB Topical Ref
