Concrete roof repairs are necessary because the material is usually susceptible to cracking, crazing, scaling, and etc. In minor cases, timely  maintenance will help ensure that there is no form of structural damage. The main problem with the use of concrete roofs is that the material is porous and eventually retains moisture. This moisture can result to cracking or corrosion of rebars which then leads to spalling. Water leaks are the most common complaints when concrete tiles are used.

Waterproofing
When there are leaks on a flat concrete roof, the repair always involves the application of a waterproof cement or sealant at the location of the leak. Oftentimes, cracks may be filled with similar caulking materials to prevent damage. But if you really intend to fix and avoid leaks to a more significant extent, the best choice would be to waterproof your entire surface regardless of where the leaks are located. Make sure you clean the entire surface with pressure washer before proceeding with the project. Fill cracks with cement or mortar and apply a good prime. As soon as the prime has dried up, apply elastomeric sealant to corners, cracks and other damaged areas and lastly to the entire roof. Follow a second coat after a day.

Roofing felt
Damaged tile can be repaired by replacing or repositioning. While it is still necessary to replace these cracked tiles and reposition if they don’t fit snuggly, sometimes the root of the problem is actually below the surface. When spacing appear in them, fixing would usually involve re-caulking exposed nails and replacing tiles. But even after extensive work the problem remains, then the main problem is the felt. Even if the felt doesn’t appear to be broken or damaged, it can still cause seepage especially if it is old and worn out already.

Spotting the Source
A popular practice in repairing is checking the area that is just above the leak. However, the actual source could be somewhere else. To avoid committing this error, don’t restrict your inspection to the area just above.  Check corners, sides, drain pipes & etc. There are times when leaks aren’t visible on the surface. A faulty plumbing line may also be the source. Concrete is permeable so water drainage can result from one point to another.