The first step on how to stop water leakage from concrete roof is to find the source.
Stop leaking concrete roof.
You may also visit the sides of your building drainage pipes etc.
Epoxy and polyurethane can save a damaged concrete roof.
A fresh coat of water proofing insulation layer and screed has to be laid in order and as per guidelines mentioned.
For very wide cracks actively leaking cracks or cracks that exhibit obvious movement more often will have better results being injected with.
Most of the time cracks can be filled with caulking materials to prevent further damage.
Redoing the waterproofing from the rcc slab is cumbersome and expensive.
Keep in mind that even concrete that is free of cracks or damage is still very porous and able to retain moisture.
Crack repair in concrete roof.
New repairs using epoxy and polyurethane foam when performed properly offer years of relief from leaks.
Advances in crack repair for home foundations extend to needed repairs in concrete roofs.
Check the entire roof surface look out for ponding water and inspect the plumbing lines.
Small nail holes left behind from old vents satellite dish brackets or anything previously attached to the roof can allow water to enter and cause damage for years before leaking is noticed.
For thin or hairline cracks low viscosity epoxy resins will more often achieve better results.
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.
Patch the nail or screw holes by slipping a piece of roof flashing underneath the shingle.
The screeding can then be replaced.
The existing screed and brick bat layers need to be broken and removed.