Flat Roofing: Advantages & Disadvantages

What is Flat Roofing?

A flat roof is one that is laid at an angle to the horizontal of less than 10°. Precast concrete with channel units, waffle units, etc., flagstones supported on rolled steel joists, or jack arch type is some examples of flat roof materials. Another option is reinforced brickwork.

Effective roof drainage and waterproofing are the two most crucial flat roof requirements. To meet these standards, the roof surface must be given the correct waterproofing treatment and suitable slopes. In order to adequately insulate the space below, a layer of insulating material (such as mud, lime, or concrete) is also spread over the roof surface. Terracing or grading is the name for this area.

By varying the terracing material’s thickness or by building the roof slab in a slope, a certain slope can be added to the roof. When thermal insulation is not required, the slope for the roof’s drainage is built into the roof slab itself, and the surface of the roof is adequately treated for water proofing using bitumen felts and other materials. The top surface of the terracing should be made wear-resistant in locations where the terraced roof will be utilized for outdoor living in addition to ensuring arrangements for effective waterproofing and drainage for the roof.

Advantages of Flat Roof:

  • The upkeep of a flat roof is simple and straightforward.
  • The roof can be used as a terrace for outdoor activities including sleeping, playing, and gardening.
  • Compared to a sloping roof, a flat roof is simpler to make fireproof.
  • False ceilings, which are necessary under pitched roofs, are not necessary.
  • Flat roofs have been shown to be generally cost-effective.

Disadvantages of Flat Roof

  • The roof is heavier on its own. Because of this, beams, columns, and other structural elements are large and weighty.
  • Flat roofs are exposed to the sun and are vulnerable to abrupt temperature changes, both of which can cause surface fractures.
  • They are inappropriate in areas with high rainfall, steep terrain, or high snowfall.
  • In comparison to a pitched roof, the progress of the work is slower on a flat roof.
  • A flat roof also costs more up front than a pitched roof.