Where is your water going first? If there is ponding on your flat roof then apa solution also no use. Make sure water discharge fast enough first. Then only solve the leak.

Seems like you said when heavy rain the water won't go over the kerb, that means that water is ponding!!! There should not be a layer of water there in the first place. It means that your discharge is under designed. look into that first.

(many contractor, and architects for that matter, don't understand that water discharged needs to be designed. Just because you have a floor trap there does not mean that it is good enough to discharge all the water. it needs to be sized properly. ie- the bigger the flat roof, the larger the discharge)

This post has been edited by Bishop: Apr 30 2011, 02:11 AM

Not a very elegant solution. Such a large pipe coming down the side of your house.

Anyway the construction is completely wrong. The parapet/kerb/upturn that is now built in bricks should have been casted in concrete together with the flat roof. That was the cause of the leak. Sad to say you are not safe. Different expansion rate of the bricks and concrete will cause it to crack again at a later time. After a while you will probably see a horizontal line where the brick sits on the concrete flat roof and see water stain there.

Actually the awning/metal deck solution that someone suggested earlier would be the safest solution.

Is the place dry after rain or is there still water there ponding after the rain?

Go take a look immediately after rain and see. If there is water ponding then the screeding is not done properly. What that means is the water is not flowing to your discharge. If water is ponding leaks will eventually happen.

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Added on April 30, 2011, 11:55 amThis means there is ponding. there should not be a water sign if the screeding is done properly.

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Added on April 30, 2011, 12:00 pmYep. his contractor has a poor understanding of construction.

This post has been edited by Bishop: Apr 30 2011, 12:00 PM

If you want to do L metal sheet (technical term is "flashing") then the solution given by a previous poster is correct.