Tiled roofs do leak in certain situations as you describe it seems your unfortunate to have a case of bad workmanship.
Fix a tile roof leak.
Defective or worn out waterproof membrane collection of debris in the roof valley cracked tiles broken tiles.
There is no such thing as a tile roof leak where the repair can be done without first deconstructing the area of tiles and flashing.
The solution is to strip the fault x areas and correct the underlining added extra underlining and relay the existing tiles back.
It must be sealed below the tiles.
If a leak is difficult to find enlist a helper and go up on the roof with a garden hose.
How to repair leaking concrete tile roofs step 1.
3 spread a small amount of roofing cement along the underside of the replacement and slide it into place.
Cracked or broken roof tile 1 carefully pry up the tile or tiles just above the cracked or broken one.
Leak repairs to tile roofs cannot be repaired by sealing anything on top.
Also pry or force out any nails.
Once you know how many tiles are needed you can make sure that you get plenty of.
Small nail holes left behind from old vents satellite dish brackets or anything previously attached to the roof can allow water to enter and cause damage for years before leaking is noticed.
Isolate areas when you run the hose.
For example soak the downhill side of a chimney first then each side then the top on both sides.
Ascend the ladder with your tools and carefully make your way to the leaking section of the concrete tile roof.
You will start the repair process by examining the roof tiles to find just how bad the damage.
If several tiles must be replaced begin at one end and work your way across.
2 break the faulty tile and remove the pieces.
Identify the first tile to be removed and carefully lift the tile above it enough to allow you to slide the crowbar beneath it.