The screeding can then be replaced.
How to stop concrete roof leaking.
Concrete cannot be the top layer of any roof.
Check the entire roof surface look out for ponding water and inspect the plumbing lines.
Look for cracks in the base of flexible rubber flashing or broken seams in metal varieties of vent pipe flashing the rubber gasket that surrounds the vent pipe could be rotted.
Waterproofing cracks on concrete roof with an elastomeric polyurethane sealant.
Begin by removing the shingles down to the wood sheathing and slip a strip of adhesive ice and water barrier available where roofing repair products are sold under the soffit main roof joint.
The most common complaint with regard to both concrete tile and flat concrete roofing is water leaks.
Most likely you have just a concrete slab and not roof system with layers of insulation what you should do is to cover concrete with metal sheet for example.
Check plumbing vent boots and roof vents if water is entering from that area to cause the leaking roof.
It must be under slope.
For more information on sustainable waterproofing for concrete roofs.
You may also visit the sides of your building drainage pipes etc.
The first step on how to stop water leakage from concrete roof is to find the source.
The solution begins with good flashing since this should stop leaks from rainfall and might stop the leaks from ice dams as well.
When repairing a leaking roof the fundamental issue is that it is the reinforced concrete that is leaking and the best approach is to remove the screed and expose the reinforced concrete so that leaks can be found and properly sealed.
Do waterproof your roof.