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Building Houses.
In order to understand how a house is built we must start at the beginning. The first thing to do is to level the ground and make the foundations. These are usually made of concrete which is poured into trenches dug in the ground. They have to be strong enough to hold up the building, and so it is important to prevent them from cracking or shifting. While the foundations are being built, the main drains must be laid to connect up to the public sewers.
A timber-framed building has concrete foundation walls on top of a footing of concrete, and then timber sills which are anchored to the concrete while it is still wet. In brick-built houses the courses of bricks start on top of the concrete foundations. The first courses of bricks must be built carefully, for the whole house will rest on them.
Once the foundations and floor are complete, the main part of the house can be built up. In timber-framed houses the main supporting joists are sometimes made of steel or reinforced concrete. Heavy timbers must be used for supporting the roof and stairs and for door and window frames; for the rest of the structure lighter timber is used. In brick-built houses the walls are built up in double layers and the wooden framework for doors and windows as well as the wooden joists for the floors are incorporated as work goes on. As the house rises it is necessary to provide scaffolding and platforms for the workers to stand on. This is made of steel tubing with planks laid across, ladders to go up and down, and hoists to lift up the building materials.