Iron is not used to build houses, but iron is used in other things because it is strong.
Iron is used in construction due to its strength and durability. In bridges, iron is often used because it can support heavy loads and provide stability. In houses, iron is commonly used in structural elements like beams and columns to provide strength and support to the building.
iron is used to make bridges (i think)
steel cable suspension
iron is used to make bridges (i think)
iron ore
Stone bridges were built to get over rivers etc, before iron or steel was used.
On the chance that you are not just looking for some clever reply or punchline, your question is a bit broad. Please consider resubmitting it and try to be more specific. For example: Are you interested in knowing the types of building materials that are used to construct houses, bridges and roads? Or, do you want to know about the tools and equipment used? Or, perhaps your question is in regard to the people involved in building these things? There are some materials and tools that are common to the construction of all three. If we are talking about people however, the person who builds highways will probably have different training than one who builds houses, or maybe even bridges.
hemalite
hemalite
People in the Iron Age typically built houses using materials such as wood, mud bricks, thatch, and stone. They would construct the frame of the house using wooden beams or stone, and then fill in the walls with mud bricks or stones. Thatched roofs were commonly used for shelter.
It is used for producing cast iron cannons, bridges and Cast iron collums.
Zinc is electroplated on iron to form a protective barrier against corrosion. This process, known as galvanization, helps to prevent rusting of the iron structure, such as bridges, by acting as a sacrificial anode. The zinc coating corrodes preferentially to the iron, thus extending the lifespan of the structure.