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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.

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.

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.

-Press and release the smart button on garage door opener motor unit. The smart indicator light will glow steadily for 30 seconds.

Press and hold the LEARN button on garage door opener until the learn LED goes out (approximately 6 seconds). Immediately press and hold the LEARN button again until the learn LED goes out. All codes and MyQ accessories are now erased. Reprogram any accessory you wish to use.