I am looking into a barn conversion with a huge roof area. At present the barns are covered in corrugated iron and there is planning permission to replace this with red tiles. I am concerned that the old wooden frame will not support the weight of the tiles and the cost of so many tiles. I really like the look of zinc roofing. It also appears to be in keeping with the original roof type, cheaper, lighter and quicker to install. How do planners look at this type of roof?