Leakage of Flat Roofs

Following preventive measures and repairs may be undertaken to prevent leakage.

1. During construction stage itself, flat concrete roofs are to be cured perfectly. Any leakage noticed at this stage can be rectified easily. All surfaces can be given a coat of hot blown asphalt after curing.
2. Adequate slope may be given to the drain pipe joints such that stagnation of water is prevented.
3. Wherever the horizontal surfaces meet the vertical or inclined faces, fillets are to be provided. The gap formed with time has to be closed periodically.
4. All the entry points of the rain water should be checked and should not be blocked by leaves, wastes, etc.
5. Weathering courses, like flat tiles, laid on the roof should not crack. If cracks are found they should be closed immediate by grouting or otherwise.
6. Very porous concrete slabs may have to be grouted.