lift or carry up to 35 pounds frequently (34 - 66% of the workday) and 100 pounds occasionally (less than 33% of the workday); lift up to 100 pounds to waist height and up to 35 pounds in a range of motions from floor to overhead: frequently use hands for simple grasping, fine manipulation, pushing or pulling (34 - 66% of the workday); occasionally crawl, knee stand, lie down, push or pull with forces up to 100 pounds (less than 33% of the work day); frequently bend, squat, kneel, lift overhead, climb ladders or stairs, reach overhead, push or pull with forces up to 35 pounds; (34 - 66% of the work day); work outdoors in a variety of temperatures and environmental conditions; possess ability to work at heights, full range of body motions and physical agility, and ability to maintain balance. The following tasks and skills that would be necessary for any person to fulfill while working in any of the job classifications within the Roofing/Tin Shop: stand or walk up to 2 hours at one time, up to 8 hours per day; sit for less than 2 hours during an 8-hour day; operates motor vehicles or heavy equipment (e.g., forklift, high reach, cherry picker) occasionally (less than 33% of the workday).