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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!
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
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.
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