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Insulation is often installed under the outer layer. In developed countries, the majority of dwellings have a ceiling installed under the structural member of the roof. The purpose is to insulate against heat and cold, noise, dirt and often from the droppings and lice of birds who frequently choose roofs as nesting places. Insulation may mean:

• Building insulation, added to buildings for comfort and energy efficiency.
• Soundproofing, also known as acoustic insulation, any means of reducing the intensity of sound
• Thermal insulation, materials used to reduce the rate of heat transfer
• Electrical insulation, the use of material to resist the flow of electric current
• In genetics, an insulator is a regulatory wequence found between enhancers and promotors to improve the gene specificity of regulatory proteins

What is roof?

A roof is the covering on the uppermost part of a building. A roof protects the building and its contents from the effects of weather. Structures that require roofs range from a letter box to a cathedral or stadium, dwellings being the most numerous 

Features

In most countries a roof protects primarily against rain. Depending upon the nature of the building, the roof may also protect against heat, against sunlight, against cold and against wind. Other types of structure, for example, a garden conservatory, might use roofing that protects against cold, wind and rain but admits light. A verandah may be roofed with material that protects against sunlight but admits the other elements.
The characteristics of a roof are dependent upon the purpose of the building that it covers, the available roofing materials and the local traditions of construction and wider concepts of architectural design and practice and may also be governed by local or national legislation  

The elements in the design of a roof are:

• The material
• The construction
• The durability
  

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