What is a flat Roof? | Benefits and drawback of Flat Roofs - lceted -lceted LCETED INSTITUTE FOR CIVIL ENGINEERS

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Jun 13, 2021

What is a flat Roof? | Benefits and drawback of Flat Roofs - lceted


Flat roofs can be horizontal or practically horizontal with a slope of 1 degree to 5 degrees. Even a complete horizontal roof should have some slope above so that rainwater can drain out easily and quickly.

A flat roof can be precast concrete with reinforced cement concrete reinforced brickwork, flagstones supported on rolled steel joists or jack arch type. Flat roofs are properly treated to protect them from the adverse effects of rain, snow, heat, etc.

Efficient water-verification of flat roofs and roof drainage is an important requirement. In addition, a layer of insulation material (soil, lime, concrete, clay pucca, etc.) is laid on the roof surface to provide adequate thermal insulation for space below. This layer is called terrace or grade.

In areas with heavy rainfall the slope of the flat roof may be increased. The slope of the roof can be provided by varying the thickness of the terrace material, or by setting the roof layer on the slopes, or by providing a partial slope of the roof layer, or a portion of the material on the terrace.

In cases where thermal insulation is not required, the slope for roof drainage in the slab roof itself is provided and waterproofing of the roof surface using bitumen felts etc. is adequately treated. To ensure water tightness.




The common types of flat roofs are


·       Brick concrete Terrace Roofs

·       Jack Arch Flat Roofs

·       C.C or Reinforced Brick Slab roofs

·       Mud- Terrace Roofing

·       Brick- Jelly or Madras Terrace Roofing

·       Bengal- Terrace Roofing

·       Mud-Terraced Roofing.

·       Mud-Phaska Terracing With Tile Paving.

·       Lime Concrete Terrace.

·       Lime Concrete Terracing With Tile Paving.

·       Light Weight Flat Roofing.



·       Can be used for living purposes.

·       Relatively safer than other types of roofs.

·       Construction and maintenance are simpler and more economical.

·       Provides better lighting, ventilation and architectural appearance.

·       If you wish you can build the upper floors in minimal time.

·       It is more economical than pitched roofs for general residential and public buildings because false ceilings are required for thermal comfort.




·       It cannot be used for industrial sheds without the use of intermediate columns.

·       These roofs are not suitable for areas where there is a lot of rain or snow.


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