Brick Bat Coba
A traditional Indian terrace treatment of broken brick pieces bedded in waterproofed cement mortar, laid to a fall and finished with china mosaic or IPS. Typically 75 to 115 mm thick.
On an actual building
It does three jobs at once — creates the fall, insulates the slab against heat, and forms a thick forgiving barrier. It remains the default on society terraces because it is repairable and locally serviceable.
What we most often have to correct
That it can be laid quickly. Coba needs 14 to 21 days of water curing, and compressing that is the most common reason it cracks.
Terms that come up alongside this one
- China Mosaic
A terrace finish of broken glazed ceramic tile pieces set in waterproofed cement mortar, laid glazed face up..
- IPS (Indian Patent Stone)
A cement-concrete topping laid and floated to a hard monolithic surface, typically 25 to 50 mm thick, used as a screed or wearing course..
- Curing
Keeping cementitious material adequately moist and at a suitable temperature while it hydrates and develops strength and impermeability..
More systems terms
Brick Bat Coba — questions we get asked
What does brick bat coba mean in waterproofing?
A traditional Indian terrace treatment of broken brick pieces bedded in waterproofed cement mortar, laid to a fall and finished with china mosaic or IPS. Typically 75 to 115 mm thick.
Why does brick bat coba matter on a real project?
It does three jobs at once — creates the fall, insulates the slab against heat, and forms a thick forgiving barrier. It remains the default on society terraces because it is repairable and locally serviceable.
What do people commonly get wrong about brick bat coba?
That it can be laid quickly. Coba needs 14 to 21 days of water curing, and compressing that is the most common reason it cracks.
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