A 10 to 15 cm thick slab of reinforced concrete with a thin 2 to 5 cm thick layer of cement on the top.
Concrete slab roof leaking.
Most concrete roofs follow a similar type of construction.
Here in florida most building foundations are concrete slab.
Concrete cannot be the top layer of any roof.
This cement layer is known as a screed and contrary to popular belief its purpose is not to waterproof the roof.
It must be under slope.
No water isn t going to soak up like a sponge but concrete does allow water to seep through when there is enough.
What is extremely important is that this metal sheet isn t horizontal.
However concrete is porous.
Roof penetrations are ac units vents drains pipes steel protuding from the roof and other systems that come through the concrete roof.
Do waterproof your roof.
Concrete also cracks and those cracks will be the first.
The most common complaint with regard to both concrete tile and flat concrete roofing is water leaks.
Roof penetrations are found on many flat concrete slab roofs.
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.