Home Tab > Input Panel > Roof Specifications 
Allows you to specify the roof parameters. This dialog box is optional for tank input.
The Roof Specification Parameters dialog box is divided into three tabs:
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General Roof Specs (Roof Specification) - Specifies the overall geometry of the roof. Whenever a tank has a roof to be designed, values for the top half of this dialog must be defined.
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Cone Roof and Material Data (Roof Specification) - Defines the data necessary for supported cone roof design.
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Girder Rings Tab (Roof Specification) - Specifies the location of each girder ring and how many girders make up the ring.