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The standard rule is engineered can be glued down to concrete slabs, but solid cannot. To install solid over concrete, plywood must be nailed down to the concrete first, with the wood nailed to the plywood. Although the hardness of bamboo flooring used to be rated on the Janka scale of somewhere around the equivalent of red oak, however in the past few years, due to the increase and production of bamboo products, more of the younger bamboo has been used for the manufacture of bamboo flooring, resulting in that much of flooring is much softer than it was originally rated and considered. Carbonizing bamboo (darkening its natural color) further softens the material. The installer, who installed Brazilian teak in my home, commented that he does not like bamboo because it is soft, and primarily because it easily absorbs water and distorts much more readily than other species.
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