All parts of sloping roof are to be checked for leakage. It is difficult to repair after construction, particularly tiled roofs. It is generally recommended to apply waterproofing coating at the construction stage itself. Tiled roofs leak during heavy rain due to lack of this precaution.
Other sloping roofs like folded plates, shells, etc., are made out of concrete. These roofs would not have been compacted properly due to sloping surface. During normal rains there is no problem of leakage. During heavy rains, water may seep through the concrete and tend to leak. A cement coating may fill the porous concrete followed by a waterproofing coating may stop the further leakage.
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