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What is this flooring


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I came across a type of sub flooring I am unfamiliar with. It's a mortar type material, about 1 to 1.5 inches thick. Based on what can be seen in the basement it is over a wood subfloor and wood joists. Linoleum was laid right over this material.

I suspect it might be a fireproofing or sound proofing material. The problem is is has cracked and the floors are uneven.

This is a four unit multi family built around 1942.

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