The steel can be painted, providing water resistance. Likewise, the fire resistance material utilized to envelope steel is typically water resistant. Mold - Steel supplies a less ideal surface area environment for mold to grow than wood. The highest structures today (commonly called "skyscrapers" or high-rise) are constructed using structural steel due to its constructability, along with its high strength-to-weight ratio.
This is because of the much larger volume required for a structural concrete member to support the exact same load; steel, though denser, does not require as much product to bring a load. However, this advantage becomes unimportant for low-rise structures, or those with numerous stories or less. https://anotepad.com/notes/bk93wwnr -rise structures distribute much smaller loads than high-rise structures, making concrete the affordable choice.
Structural steel and strengthened concrete are not constantly selected solely since they are the most perfect material for the structure. Business rely on the ability to turn a profit for any construction project, as do the designers. The rate of basic materials (steel, cement, coarse aggregate, great aggregate, lumber for form-work, etc) is constantly altering.
Another significant variable is the location of the task. The closest steel fabrication facility may be much even more from the building site than the nearby concrete provider. The high expense of energy and transportation will control the selection of the material too. All of these costs will be taken into account before the conceptual design of a construction task is started.