Visible cracks not giving hollow sounds need to be directly treated.
Concrete roof leak repair.
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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.
What kind of stuctural repairs can we have for cracks on.
One way i suppose they make cement based fillers that expand on curing they are used to seal leaking concrete water tanks.
This sealant you have chosen will expand and contract at a different rate to the concrete so it is doomed to fail fairly quickly.
Details are at flat roof leak repair.
If a concrete roof is leaking typical repair is to use a combination of synethtic fabric membrane and a concrete roof sealant mastic or paint.
Creating a v groove 10 x 10 mm on the crack observed and clean the groove with vacuum cleaner and or water jet.
Always run a test patch first to ensure that proper adhesion and drying occurs and the product works to your satisfaction.
Most of the times cracks can be filled with similar caulking materials to prevent further damage to the roof but this is only a temporary fix.
Repair large holes with concrete patch.
Keep in mind that even concrete that is free of cracks or damage is still very porous and able to retain moisture.
For this you will need mortar or roof cement roof primer and an elastomeric sealant.
Lamposil is one.
Due to everyday wear and tear situation concrete becomes prone to cracks and holes.
Some pva glue down the crack first would help.
For thin or hairline cracks low viscosity epoxy resins will more often achieve better results.
New repairs using epoxy and polyurethane foam when performed properly offer years of relief from leaks.
Most of the time cracks can be filled with caulking materials to prevent further damage.
May 11 2016 aditi said.
The whole concrete roof is cleaned and power washed then flood coated with epdmcoatings elastomeric pure acrylic primer.
Water can penetrate these spaces which could result in further leakage.
In some less complicated cases you can perform minor roof repairs.
Advances in crack repair for home foundations extend to needed repairs in concrete roofs.
Seal the frove with a non shrink repair mortar available with construction chemical companies like permaindia sika dr fixit etc.
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.
The screeding can then be replaced.