waterproofing of leaking concrete roof and a pond, what are the material to use and how to do waterproofing?

we have a roof made of concrete to our porch and verendah; and now after few months, it start leaking especially at the joint to the wall. we are worried that the water leakage will reduce the strenght of that concrete roof. we also have a fish pond by DIY, but it cannot retain water and we cannot trace the source of leakage but suspect it must be from concrete work.

Public Comments

1. you can get rubber paint at any hardware store put on 2 or 3 coats if there is hairline cracks if the cracks are bigger you have to chip it our and use hydraulic cement then the rubber paint