I've used 3;1 Sharp sand & cement for a 3 brick high (2 by 2) post, topped with the mix & a piece of slate, to support a slightly flexing joist at the foot of a staircase, in preparation for laying Victorian floor tiles. These will be on Hardie backer board over floorboards. My concern is whether the cement mix combo I've used will stand the test of time? Thanks
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