Raul
    Construction of house slabs on grade have had problems for years with
vapor coming thru the slab and blistering vinyl flooring. I suspect this is
a similar situation if there is a water source outside. There are coatings
available at hardware stores for concrete but they are being applied to the
wrong side of the concrete. They would work better on the source side. It is
worth a try though. You may need a descecent(spelling?) to keep the humidity
down.
Barry


Raul Alvarez wrote:

> Hi All,
>
> Started working on a seismo vault here.  Plans are to use an old, but
> still water tight, cistern that was on the property when we purchased it
>
> some five years ago.  The cistern is 4 feet wide, 8 feet long and 5 feet
>
> high.  The top is about 2 feet below grade. Seems like it would make
> a great seismo vault.
> My guess about it still being water tight is that it was mostly full of
> water but the outside ground is very dry.  Since I pumped it out, water
> has
> not re-accumulated.
>
> My questions are: I want to be sure it will stay dry.  What, if any,
> paint
> could be used to seal it from the inside?
> Also, after being in it a while, getting the last of the water and silt
> out,
> I got to thinking about the effects of the echoes created in such a box,
>
> and how they may affect a seismo.
> Any suggestions, comments ???
>
> Raul
>


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