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Terrace garden designed by #Treesoul.in.

Yes, as Cornerstone says, please don't redo the water-proofing if it has already been done once. Tiles are a far better option than decking with composed fibre-wood. No matter how hardy the latter material is, it is going to be a muddy and wet area, so please go with a good anti skid ceramic tile. Check on the final use with the manufacturer- that it is going to be laid on the terrace and exposed to sun. Use at least 3 mm spacers to allow for some expansion over a period of time. Also leaves enough space to insert waterproofing epoxy and secure the tiles