What is the form and function of the roof of a house?

The basic shapes of roofs are flat, mono-pitched, gabled, hipped, butterfly, arched and domed. There are many variations on these types. Roofs constructed of flat sections that are sloped are referred to as pitched roofs (generally if the angle exceeds 10 degrees).

The basic function of any roof is to offer protection from the elements for people and their possessions. Roofs can also provide insulation, retaining heat in the winter or cool air in the summer. Certain roofing materials - especially those of fibrous origin - offer strong insulation

the roof is the uppermost element of a building whose main function is to enclose the space and protect the inhabitants from the effects of the weather.

Explanation:

However, this can be further expanded, the roof will also serve to direct any water to the guttering and drainage system.