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Waterproof rendering for pool

I have designed a freestanding raised rectangular water feature which has been built with blockwork and a flexible liner, but for aesthetic reasons we want to replace the liner with a waterproof render. Has anyone any recommendations for the type of render and waterproofing technique to use that is proven to last, leak free? I have had a number of landscapers giving me the stroky beard response, suggesting that such renders are not always a long term solution. Any ideas?

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  • We have done loads of such pools.  We would render one coat, then introduce chicken wire, wiring together, before a final coat with waterfroofing agent in each coat. A soft 3"paint brish would give a good sealed fininsh. After a few days a coat(or two) of G4 sealer would complete the job.  Never had one leak!

    • PRO

      also using SBR with cement for external work giving a bonding coat before each render layer will also add very good waterproof layers, with an add mix in the render to for waterproofing this shouldn't leak at all

    • PRO

      Thanks Colin, that's useful. Am struggling to find someone in the South West with the same experience!

  • The standard technique is to use a rubberised paint like Pondseal.  Don't skimp as a leaking pond is a real pain.  You can get liner with gravel etc bonded to it to disguise it.  Be wary with rectangles. Vertical sides don't allow for ice expansion.  A well filled planting shelf will conceal the liner.

    • PRO

      HI Peter, thanks for that. It's not designed like a wildlife pond with planting shelves, it's more of a formal ornamental pond. But I tale your point about the ice expansion. I think that's porbably the main issue. Sounds like coated render is probably the way forward. Someone else (not here) has suggested fibreglass....

      • I have seen a liner disguised by running it inside the top layer of blocks.  Remember to allow for filtration etc. Nothing worse than an ornamental bowl of smelly green soup

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