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Steve Firth Steve Firth is offline
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Default waterproofing a flat concrete roof

TMC wrote:

Looking at the fibrous paints or other low cost solution

any recommendations


The usual solution in places like Italy where flat concrete roofs are
normal is to lay a waterproof screed on the roof. This requires the roof
to be clean and dry before you start.

http://www.izonil.com/uk/improver.html

For example.