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Hi Battler, It's definitely not an excess sheet of plaster because it wouldn't be so uniform and in all areas under the house. If it's in the foundations, what's the purpose of this layer and what bad things might happen if I do?

btw, this layer is only about a centiment deep and is quite uniform though out the foundation.

If it were cocaine that would make me rich. :rolleyes: On a second thought might land me in jail too.:p But if it was calcium hydroxide what is the purpose of that layer? Keep pests away? keep ground dry? I am not sure.

I have a 1960's double brick house with brick piers under the house. And the house is on a gently slopping piece of land. At the back the house is almost 1 storey higher than ground level. So I thought it's a good idea to dig out a bit of dirt under the house and I can make a store room out of...