KC wrote in
oups.com:

On Jul 3, 5:23 pm, "Bob F" wrote:
"Jim Elbrecht" wrote in message

...





A couple years ago I had to dig up my foundation, and despite our
best
efforts at machine tamping to 'refusal'- it apparently wasn't
enough.

So now the slab for my oil barrel is pitched 1/2 inch towards the
house. If it went the other way, I'd just watch it-- but I'd
like
to correct it as it is bound to get worse. The slab is 3-4"thick
and
3'x6'.

I can lift the slab at the two low corners and get it back to level-
and will pitch it away from the house. But what is the best way
to try to get a slurry under as much of the slab as possible.

My first thoughts are to;
1. make roughly 8" square access holes a foot deep on the 2 low
corners -
2. jack to level-
3. enclose the 'piers' and most of the back side - leaving a space
in
the center.
4. fill with a loose slurry until it begins to ooze from the
center.

I have access to a concrete vibrator- but I have only seen one in
use
once and I'm not sure if it will work here.

What are my chances that this will keep this slab more-or-less in
place for a few more years? [I'm in NY- btw- so frost will
guarantee
that it will never stay exactly where I put it- I'm just trying to
get it to be 'off' in the right direction.]

I just leveled a concrete hot tub/spa. I jacked it up, then pumped
fairly fluid grout under it using a hand powered grout pump I bought
second hand. I connected the pump output to 3/4" pvc pipe and slipped
that under the slab, built a wall around the edge, and pumped until it
came back out, and then some.

Bob- Hide quoted text -

- Show quoted text -

I've seen them level a sinking corner of an office building slab by
underdigging down about 24", pour a small 4" slab, let it dry, insert
several jacks between the new & old slabs, get the old slab level,
then fill the whole thing with concrete leaving the jacks imbedded in
the concrete. A real red-neck fix but it worked.

KC


To raise your slab,drill holes for expansion anchors,place bridging beams
(4x4s)across the slab with holes drilled for threaded rods that screw into
the anchors,and put washers and nuts on the other end of the threaded
rods.Tighten the nuts to raise the slab. Then you can pour some concrete
slurry under the slab to keep it up.

--
Jim Yanik
jyanik
at
kua.net