A roof is provided to satisfy the following basic requirements:
- It should give a protective covering against the adverse effects of atmosphere.
- It should have adequate slope to drain the rain and snow.
- It should be strong, stable and durable to take the external loads.
- It should provide sufficient insulation against heat and sound.
- It should meet the different climatic conditions and accordingly the covering material has to be chosen.
- It should also provide good architectural appearance.
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