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Red-neck mudjacking? Jim Elbrecht 07-03-2007
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Posted by Jim Elbrecht on July 3, 2007, 3:15 pm
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.]

Thanks,
Jim

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Posted by Abe on July 3, 2007, 3:53 pm
>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-
Any chance you could make the jacks permanent and adjust them as
needed?

Posted by Pete C. on July 3, 2007, 5:02 pm
Abe wrote:
>
> >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-
> Any chance you could make the jacks permanent and adjust them as
> needed?

If it's the usual 275-330 gal tank with pipe legs, just get four of the
standard scaffold screw jacks and some suitable washers and install them
into the pipe legs so you can just adjust them as needed and not care if
the slab is a little out of level.

Posted by Jim Elbrecht on July 4, 2007, 6:37 am
wrote:

-snip-
>If it's the usual 275-330 gal tank with pipe legs, just get four of the
>standard scaffold screw jacks and some suitable washers and install them
>into the pipe legs so you can just adjust them as needed and not care if
>the slab is a little out of level.

I don't mind the slight out of level as much as I don't like it
dumping the runoff towards my house. There is about a foot gap- but
it just isn't a good place to have extra water.

If the slab was pitched away from the house I'd be getting 2 screw
jacks.

Thanks-
Jim


Posted by Jim Elbrecht on July 4, 2007, 6:35 am
-snip-
>Any chance you could make the jacks permanent and adjust them as
>needed?

I considered that- but it will leave me with a much smaller footprint
that is more likely to sink again. By filling the air gap with
grout/mortar, I at least stand a chance that I might not have to do
this job again. [or so I hope]

Thanks-

Jim


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