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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.

The best bathroom cleaners are those that help in removing the tough and stubborn stains in a gentle way without discoloring or scratching the tiles and glass walls. For homemade cleaners, mix together lime, vinegar, and baking soda. This solution works really well in cleaning tough stains. You can use fragrance separately to clear the bathroom air

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.

To deep clean a bathroom, you need a microfiber cloth; toothbrush to clean the narrow spaces and the grimy area; vinegar and water mixture in the ratio 1:1; baking soda; paper towels, etc. First, remove all the items from the shelves. Wipe out the dust (if any) from all the grooves and corners. A steam spray will work the best for this. Again, wipe

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.