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This conventional method has severe following limitations, hence it can’t be called as a waterproofing method.
Imposes Unnecessary Load
terrace waterproofing

terrace waterproofing This system has the disadvantage of imposing an unnecessary load on the system. The thickness of the coba is maintained at about 125mm to 150mm which adds unnecessary dead load on the slab.
Once cracks appear, they are almost impossible to repair and water as in the case of the tar felting travels below the coba and exits wherever it finds a path. It is impossible to trace the inlet point and let alone repair it.
Cracks Reappeared Due to Temperature Variations