METHODOLOGY FOR BRICK BAT COBA (Water Drain Out System). SR. DESCRIPTION. 1 SURFACE PREPARATION. Cleaning the existing the RCC surface. Brick Bat Coba (BBC) is believed to be a waterproofing and BBC and other traditional methods like Mud Fuska or lime terracing are still being. BRICK-BAT-COBA TREATMENT. Surface Preparation. Cleaning the surface from dust, mortar splashes loose materials etc to get a sound concrete surface.

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Advent of more efficient and easy to use and install water proofing methods are the main reasons for brick bat coba lose its prominence in waterproofing industry.

These gaps are filled with cement sand mortar, in 1: Water — Methkd to do more with less Sawdust March 22, Stone age did not come to an end because of scarcity of stones. Arch consultant required for Patna software park project Sasikala Raje December 31, This is also one of the main reasons for you not seeing this waterproofing system on many terraces nowadays.

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Why Brick Bat Coba Not the Correct Method for Terrace Waterproofing?

Also, art of laying brick bat coba requires specialized skill and non-availability of manpower having bric, skillset is also the reason for the decline of this conventional method of waterproofing. Brick bat coba is a method to provide insulation for thermal comfort and waterproofing treatment to prevent leakage of water in case of RCC roofs.

If we have advance options definitely should go for new modern and better techniques. The gaps between the brick bats are generally kept between 15 and 20 mm. Before laying brick bats having an average thickness of about metthod, about 70 mm near rain water pipe and mm at ridge are soaked overnight in water.

Similarly, brick bat coba too may disappear from roofs not because of scarcity of bricks but due to other reasons. Once laid, brick bat coba can last at least 15 years if done by skillful applicators.

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As an alternative, some embed broken tile or ceramic pieces in the plastic mortar which is often called china mosaic. Chitra October 23, at 3: This is one of the oldest methods of waterproofing which was adopted by many when we moved towards flat roof construction. This method was also preferred because of its efficiency in keeping the interiors cool.

Lot of disadvantages also of brick bat coba. Art of laying brick bat coba requires specialized skill and non-availability of manpower having this skillset is also the reason for the decline of this conventional method of waterproofing.

This method involves laying gat mortar on the roof and spreading it to give gentle slopes for draining away the rainwater immediately.

October 23, at 3: