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.
How to stop concrete roof leaking.
Check plumbing vent boots and roof vents if water is entering from that area to cause the leaking roof.
For more information on sustainable waterproofing for concrete roofs.
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.
Waterproofing cracks on concrete roof with an elastomeric polyurethane sealant.
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.
When there are leaks in a flat concrete roof the fast fix is usually to apply some kind of sealant or waterproof cement at the site of the leak.
The screeding can then be replaced.
What is extremely important is that this metal sheet isn t horizontal.
It must be under slope.
The first step on how to stop water leakage from concrete roof is to find the source.
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 the entire roof surface look out for ponding water and inspect the plumbing lines.
Do waterproof your roof.
The solution begins with good flashing since this should stop leaks from rainfall and might stop the leaks from ice dams as well.
You may also visit the sides of your building drainage pipes etc.