If your interest is to know how to repair cracks in the concrete ceiling, I will assume that you know about Cherry and Clark Roofing.
I also suppose that this suffering will have to do with situations like these:
Filtration in concrete slabs; leaks condensation on the ceiling, mold or mildew stains, moisture on the ceiling; or any other collection of symptoms that will surely have you in crisis.
The problems of water leaks in roofs are multiple and will depend on the nature of the roof in question.
If your particular problem involves the waterproofing of slab roofs, I will try to give you some guidelines, not only to waterproof the roof, but also so that you can do it on your own.
As things stand, saving yourself an expense on labor does not seem like an idea to dismiss.
HOW TO REPAIR CRACKS IN THE CONCRETE ROOF: PROBLEMS WITH SLABS
It does not seem a coincidence that roof leaks have to do so often with concrete slabs. And indeed, it is NOT a coincidence.
Unlike sheet metal (zinc) or roof tile roofs, this type of concrete roof is very prone to cause construction problems that end up generating leaks and moisture stains, always difficult to solve.
CONCRETE ROOFS: CAUSES THAT PRODUCE MOISTURE LEAKS
To remove moisture stains on the ceiling, or rather, on the ceiling of an environment, you have to start with “up” . It is impossible to pretend to know how to cover leaks if we imagine that we can solve the humidity problem from “below”. The leaks of water that reached the ceiling necessarily began with cracks, fissures in the roof. That’s why it’s from there where you’ll have to start.
One of the classics of moisture problems in ceilings originate in cement slabs (concrete).
Concrete slabs (roofs or roofs) have two basic problems that are related to their construction:
1) CEMENT OR CONCRETE SLAB EARRINGS
Due to its position, which is usually horizontal, concrete roofs or roofs do not have a good runoff surface for rainwater. They are designed so that they look “flat” (although in reality they are not).
If for those things of bad execution, the minimum slopes with which they tend to project and build are not enough, the water tends to float causing filtration problems.
Unlike the sloping roofs here, gravity does not work in our favor so the water runs out fast and does not park. And we already know: little slope = leaks.
2) CRACKS IN THE CONCRETE ROOF
Concrete roofs do not always have good thermal insulation to protect them from exposure to the sun’s rays. This insulation is more expensive and adds thickness, “enough” reasons so that at the end of the day, they are not adequately included in its construction.
Because they are made of a heavy structure (concrete), concrete roofs without good thermal insulation end up suffering from their own movements of dilation and contraction due to being exposed to continuous climatic changes.
The movements generate cracks and fissures in the ceiling, typical of a material such as concrete, with resistance to null expansion. Logical is to assume that these cracks end up generating the need to waterproof the roof to protect it from leaks.
To all these evils we must add that, by the constant exposure to climatic agents that suffer concrete walls and slabs, it ends up accelerating the deterioration of its surface, rendering them porous and therefore permeable to moisture. That is why it is so important to waterproof a concrete roof to avoid having to cover leaks prematurely.