The depth of the existing footing will be one of the big deciders.
Go to an inconspicuous corner, break out the floor, dig down and
expose the footing - top to bottom. If your proposed floor
elevation will work with the footing and there is no buried
plumbing under the floor that is in conflict, it's just labor and
money from there.

~~~~~~~~~~~~~~~~~~~~
DanG
A live Singing Valentine quartet,
a sophisticated and elegant way to say I LOVE YOU!
(local)
http://www.singingvalentines.com/ (national)


"Alvis" wrote in message
...

I have an addition of the house built about 30 years ago and I
would
like to create a bit more headroom in this basement portion.
The past
owner used this room as a clean room to make portions of
airplanes.
Without the HVAC the exposed floor joists are about 6'3" of
clearance,
I would like to finish the room and a put in a ceiling. I know
that
there is no electrical or plumbing in the concrete and at one
end where
the room slopes towards there is a hole lined with a metal
bucket laid
in the poured concrete. It would seem to me that there us a
good 8-10
inches of poured concrete based on the sounds I get from hitting
the
inside of the bucket. How deep can I go down - I would like to
get
another 6 inches of headroom. I guess it is more important to
know can
I do this? What could I do to properly check the depth of the
crete and
also How do I check for the footing on the exterior wall and
thier
depth. I figure that once I am down to the height that I want
then I
would pour new concrete to level off.




--
Alvis