Home Roofing and False ceiling Sheet Metal Standards Grade Designations For Sheet Metals Figure In The Naming Convention Carbon And Low Alloy Steels First Digit Indicates Primary Alloying Element Second
Brief description from Sheet Metal Standards above :
With continual improvements in steel girders, these became the major structural support for large roofs, and eventually for ordinary houses as well. Another form of girder is the reinforced concrete beam, in which metal rods are encased in concrete, giving it greater strength under tension.
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