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How can I raise my existing concrete floor by 20cm up? can I directly add aggregates and sand and finish with concrete, or do I have to chip first the existing floor?

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No, The existing slab is an excellent base. Fill it with the least expensive aggregate you can buy and pour your new slab. Good Luck and happy finishing.

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  • 20 cm is nearly 8 inches. that's a lot of weight in concrete. does it need to be concrete? – Alaska Man Oct 23 '17 at 16:30
  • yes it should be concrete. will there be a possibility that the existing slab on grid may crashed down? . – benjie cris Oct 24 '17 at 12:20
  • No Chance. I'm assuming the original slab is sitting on the earth. – Paul Logan Oct 24 '17 at 15:00
  • yes. the original slab is sitting on earth. – benjie cris Oct 28 '17 at 9:11

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