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Wrought iron was actually "wrought" (i.e. worked or hammered) into bars and has been used as a construction material for thousands of years. Most metals used for construction purposes are alloys. For example, steel is an alloy with iron and carbon being the primary elements.

National average monthly cost for commercial truck insurance ranged from $650 for specialty truckers to $1000 for transport truckers. Remember, these are only averages. Insurance companies use many rating factors to calculate rates, and each can have a big influence on premium.

It was not until 1880 that an era of construction based on reliable mild steel began. By that date the quality of steels being produced had become reasonably consistent. The Home Insurance Building, completed in 1885, was the first to use skeleton frame construction, relying on its masonry cladding for stability.

The weight of the truck affects truck insurance rates. Heavier vehicles require higher coverage limits, and so cost more to insure. This is in part due to the amount of damage a heavier vehicle can cause compared to a slower one, as well as the difficulty of stopping suddenly.

An average commercial steel building costs between $16 and $20 per square foot, including building package (I-Beams, purlins, girts etc.) , delivery, foundation and the cost of construction.