RCC Roofing

Common Defects in Flat/RCC Roofing

 Slopes are not proper and lot of depression is existed on the surface where water is stagnated.Drip courses are not constructed according to required specifications. 

• Broken tiles which create depression are used in tile tracing.
• Supports of water tanks are not finished properly.
• Cement concrete ‘Gola’ with joints of walls and roof is not properly finished.
• Mouth of rainy water pipe is higher than top ‘Khurra’.  

Advantages of RCC Slab

• Energy efficient.
• Does not catch fire.
• Provides solid and durable roofing.
• Very versatile and provides greater protection.
• Reduces costs of insurance and has resale value.

Various Ratios of RCC

RCC denotes Re-in forced Cement Concrete in which cement, sand and Bajri are laid with the help of mild steel. This is most important part of the structure.Generally 1:2:4 and 1:1.5: 3 ratios of RCC are used in construction work.

RCC 1:2:4

Where cement concrete 1:2:4 is used; it means 1 part of cement 2 parts of fine aggregate/coarse sand and 4 parts of coarse aggregate. This ratio of cement concrete gives high strength of cement concrete and is recommended for following works.
• For general RCC work in buildings
• Bed plates
• Lintels
• RCC shelves
• Pavement etc.
 
RCC 1:1.5:3

Where cement concrete 1:1.5:3 is used; it means 1 part of cement 1..5 part of fine aggregate/coarse sand and 3 parts of coarse aggregate. This ratio of concrete also gives very high strength of cement concrete and is recommended for following works. 
• Structure carries in heavy loads
• Important RCC structure such as columns, beams, slabs, cantilever, Chhajja, porch, and balcony etc.
• Minimize the effects of earth quake.
• Gives more strength accordingly if Tor or Ribbed steel is used with cement concrete 1:1.5:3.