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[quote]QUOTE: Originally posted by fiverings A properly pitched "flat" roof on a model is unsusual to see. But when it's there, it conveys the same subtle but powerful sense of realism you get with a properly drained model railroad right-of-way. [/quote] A properly pitched flat roof usually has a slope of between 1/8" and 1/4" per foot. And due to the enormous load on a building's structure created by standing water, roof drains are rarely more that approximately 60 feet apart. At 1/87 scale the slope would then be so minimal that it's probably not worth trying to properly model especially with a ballasted roof system. But proper location of roof drains ( and overflow drains 2' to 4' away from each roof drain) would create a very convincing illusion. Details to consider for a "flat" roof building would include roof drains and overflows, at least one roof hatch if the building is taller than 15 feet or so, roof-top HVAC units for heating and/or cooling, exhaust fan housings, toilet vent pipes, walkway pads for access routes from a roof hatch or ladder point to equipment maintenance locations, a raised roof area where there may be an elevator below, anchor points for signage, cooling towers, etc. Any roof top equipment should be mounted on curbs and the curbs should have sloped "crickets" or drainage diverters. The use of the building will dictate some of those details. A "flat" roof that would be worth modelling accurately would be one where the building would be perhaps up to 100' wide (and at least that long) where the steel roof structure was sloped to provide the drainage. There would then be a very definate ridge line. Water would be drained either by gutters or by scuppers and downspouts.
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