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Re: Indoor garden foundation


I am currently building a 2 floor concrete house, on the slope of a
mountain and I want to install a small indoor garden right in the middle of
the house. I have specified to the contractor to make a 2mt by 2.5 mt room
that is completely enclosed by wall and windows. On the top of the roof I
have installed a window which will be used for ventilation and light.
However, I am worried about the type of foundation that should be required
for these construction. I  worry about handling the humidity, and the
irrigation system to avoid water from building up.
My contractor tells me that a concrete base is necessary to prevent the
soil from sinking. I really don't understand that. If it is indeed
necessary, approximately how deep should the base be so that I have enough
space for the roots to grow?

 Can any one give me some advise from your experience?

Thank you.

Ricardo
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