Cob: damp concrete

[Amanda Peck]

I once lived in an apartment  in which the bedroom was a converted 
garage--concrete floor.  Winter and summer, that floor remained somewhere 
between damp and soggy.  Of course, if the builders had known it would end 
up as a bedroom, they could have insulated the thing, put waterproofing 
below, and so on.  But that would have made it a PROJECT, instead of just a 
concrete floor.

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Mike Stone asked:

why is a concrete slab a bad idea for a foundation?

i'm thinking for my future project in costa rica where summertime rainfall 
is high that i will need to put in a concrete slab to get the floor level of 
my house up a bit from the ground level which can become soggy and drenched. 
is this not a good idea?

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