I want to construct a large water tank. The walls need to be

  • fairly thick (several centimetres)
  • very stiff (they will be decoratively plastered inside and out and the plaster should not crack)
  • lightweight (on the order of 2m x 2m sections to be arranged by hand)
  • effective insulators (the water is hot)
  • inexpensive
  • ideally, environmentally friendly

What should I use?

  • 1
    How large is "large"? – ThreePhaseEel Jun 1 '19 at 13:42
  • 1
    You forgot “strong” too. – Lee Sam Jun 1 '19 at 14:37
  • why would you plaster the inside of a water tank? – jsotola Jun 1 '19 at 16:12
  • @ThreePhaseEel 2m sides, as the question said. – spraff Jun 6 '19 at 11:29
  • @LeeSam To support a mass of water in a 2m box, as the question said. – spraff Jun 6 '19 at 11:29

Get a stainless steel tank and then bond / glue good insulation to the outside surface.

Then cover the insulation with a suitable covering to paint as necessary.

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