Concrete Slab Roof Leaking

Roof penetrations are found on many flat concrete slab roofs.

Concrete slab roof leaking.

This cement layer is known as a screed and contrary to popular belief its purpose is not to waterproof the roof. What is extremely important is that this metal sheet isn t horizontal. 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. No water isn t going to soak up like a sponge but concrete does allow water to seep through when there is enough.

Most concrete roofs follow a similar type of construction. The most common complaint with regard to both concrete tile and flat concrete roofing is water leaks. Concrete cannot be the top layer of any roof. However concrete is porous.

Do waterproof your roof. Concrete also cracks and those cracks will be the first. A 10 to 15 cm thick slab of reinforced concrete with a thin 2 to 5 cm thick layer of cement on the top. You have a rock hard concrete floor and it seems impervious to water intrusion.

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. Here in florida most building foundations are concrete slab.