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Any trip through rural America shows how widespread the use of metal roofing is. You'll see corrugated or ribbed steel panels not only on most barns and outbuildings, but on many houses as well. In recent years, the number of residential metal roofs has increased dramatically, with the popularity of expensive steel, copper, aluminum, and terne standing-seam roof systems. But simple corrugated and ribbed agricultural-style steel and aluminum panels are increasingly being used on houses because they provide a reasonably priced, longlasting, low-maintenance roof. Panel manufacturers, however, are reluctant to acknowledge that agricultural-type roof panels can be used for residential roofs. In many cases the manufacturer will steer a house builder to more elaborate roofing systems. Consequently, the budget-minded builder who opts to use ag-panels