As a general rule, the spacing of the frame legs and roof bows/trusses are 4 feet or 5 feet on center for single-wide buildings (up to 12 feet wide) and double-wide buildings (up to 24 feet wide) Buildings up to 24 feet wide typically use a roof bow. The spacing of the frame legs and roof trusses on triple-wide buildings are anywhere from 3′ on center up to 54″ on center. For an exact measurement on any of these dimensions, please ask and we will be happy to provide you with that information.