Brick Bat Coba Waterproofing




To prevent leakage of water this brick bat coba techniques is used. It provides waterproofing and insulation for thermal comfort for flat RCC roofs. It is one of the oldest procedure of waterproofing. In this techniques brickbats are laid to the RCC roof and grouting is done with the waterproofing compounds with a slope to drain the surface water.

In this procedure firstly, the coating on the slab top shall be removed, and surface cleaned by hard wire brush and washed with water. Main aim is to make surface free from oil, grease, dust, etc.
Then slurry is made with cement and mortar to a required consistency. Now it is applied on the dampened surface with brushes very carefully. It has to be applied on the joints between the floor slab and the parapet wall, holes on the surfaces and joints of pipes in masonry or concrete. Slurry should continue up to a height of 300 mm over the parapet wall. After that thick base of cement plaster of 25mm is laid out.  

After that, brickbats of the size (65mm to 120mm) are placed with a gap of 15 and 20mm while base coat is still green. The brickbats shall be wholly burnt and are well soaked overnight before laying.
Curing is carried out for a minimum of 24 hrs after which, the gaps between the brickbats are filled with the same mix mortar used for base coat. The surface is neatly finished with the help of wooden / steel hand float. The entire surface thus treated shall be flooded with water by making bunds with low cement mortar. The curing shall be carried out for a minimum period of 2 weeks.

Drawback of Brickbat waterproofing

Ø  The thickness of the brickbat is around 125mm to 150 mm, which adds the dead load of the building hence making it uneconomical.
Ø  There is a chances of seeping of water in the waterproofing hence waterproofing is very tedious.
Ø  Cracks are formed due to the climatic variations. 
Ø  The brickbat waterproofing is easily influenced by the external factors such as climate variations and heavy rainfall. A poor workmanship will only add to cause.

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Blog written by

Shruti Doshi
Technical Officer – Sanghi Cement & Blogger
shruti.doshi@sanghicement.com
shrutidoshi.1492@gmail.com

Blog Managed by

Nirav Pandya
Digital Marketing Officer – Sanghi Cement
nirav.pandya@sanghicement.com



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