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Discuss Hi in the Australia Tiling Forum area at TilersForums.com.
I thought 3.5 was used....
I done some training quite a few years ago and 3.5 was the standard, to be fair never heard of 2.
I think there is a 7.5 but they very strong and is as strong as concrete.
Heres a good link http://www.lime-mortars.co.uk/lime-mortar/hydraulic
Reply to Hi in the Australia Tiling Forum area at TilersForums.com