Specifies the roof type of the tank. You can choose from:
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Supported Cone - The roof is supported by rafters, girders, and columns. For supported cone roofs, the software designs the rafters, columns, and girders.
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Rafter-Supported Cone - The roof is supported by rafters only. For rafter-supported cone roofs, the software designs the rafters.
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Cone
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Dome
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Umbrella
The Cone, Dome, and Umbrella roof types are considered solely for their weight effects on the shell.