Terrace Parapet Water Proofing Treatment

Top of the parapet walls should be adequately waterproofed. Or else however good your terrace work is done, water can seep in through the top of the parapet wall as shown in the figure.

Parapet is a low wall built along the edge of the terrace roof for safety purposes and as a general appearance for the building.
The top surface of the parapet is to be protected against weathering by a coping and waterproofing or else water will seep in as shown from the above figure.
Parapet copings generally are made from cement concrete slabs and provided with a drip as shown below.
A groove should be provided on the underside of the coping, the purpose of which is to prevent rainwater running along the underside to the face of the wall. When the water reaches the groove, it has to drip down as it cannot move any further.

The water overflowing from the overhead watertank is seen flowing on the slope and escaping through the hole made for rain water outlet pipe.

This check ensures that in the monsoon, rain water will similarly make way along the slope.