How was the ancient house built?

Don't know don't make up, can say all rely on manpower, sometimes will apply to the principle of leverage. If you are in the countryside, find an old carpenter or mason in the past, you will know what I said is true or false. In the past, the tiled house needed a craftsman to calculate the water law, that is, to calculate the angle (slope) of the ridge. In the past, there was no machinery in the countryside, for example, to build the floor of a cottage, it all depended on people standing on the scaffolding and a group of people lifting it up. From this you can deduce how ancient buildings were built