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Replacing shallow basement/block foundation with deeper poured one? (OT for rec.ww)

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Replacing shallow basement/block foundation with deeper poured one? (OT for rec.ww) Max 07-03-2007
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Posted by Max on July 3, 2007, 6:25 pm
We have an old basement that is about 6'6"" at it's highest point,
with a block foundation. The floor is poured concrete, not flat,
with the usual(?) small stress cracks.

I was wondering about the feasibility of jacking up the house,
removing the old foundation, digging a little deeper, and putting
a new poured foundation with lots of (8'+) headroom.

I am specifically -not- interested in just digging out the floor.
I'd lose too much floor space that way, and I really would like to
get rid of the old block walls.

Anybody know anything about this?

I've done some googling, and all I've found seems to talk about
turning crawls into full basements. Not quite what I'm about.

I know this will be expensive, but it might be the way to go for
our situation. Having a new finished basement might be more
cost-effective than moving, if it comes to that. We bought before
the real estate price run-up of the last 5-6 years and couldn't
afford to buy in our neighborhood today!


Thanks for your time,

Max

PS: I crossposted to rec.woodworking mainly in the hopes of getting
more input, but also because this effort might result in my own
indoor
shop space instead of an unheated garage. ;-)


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Posted by Inspector Terry on July 3, 2007, 7:28 pm
This is do-able... COSTLY yes, but do-able.

Contact house movers in your area for the best results.

Good Luck!

Terry


Posted by tbasc@bellsouth.net on July 3, 2007, 9:13 pm
> This is do-able... COSTLY yes, but do-able.
>
> Contact house movers in your area for the best results.
>
> Good Luck!
>
> Terry

You could consider leaving a ring of slab around the perimeter of the
basement and digging deeper.
You ought to consult an engineer, since the soil type has a lot to do
with this working.
Don't forget that railing the house includes disconnecting and
reconnecting plumbing, gas and the like.
T


Posted by Arvid Sorsdahl on July 3, 2007, 9:05 pm
If the block walls that are there are in good condition you could jack up
the house and add a pony wall on top of the block walls. The block walls
can be reinforced with rebar both horizontal and vertical and filled with
concrete.
> We have an old basement that is about 6'6"" at it's highest point,
> with a block foundation. The floor is poured concrete, not flat,
> with the usual(?) small stress cracks.
>
> I was wondering about the feasibility of jacking up the house,
> removing the old foundation, digging a little deeper, and putting
> a new poured foundation with lots of (8'+) headroom.
>
> I am specifically -not- interested in just digging out the floor.
> I'd lose too much floor space that way, and I really would like to
> get rid of the old block walls.
>
> Anybody know anything about this?
>
> I've done some googling, and all I've found seems to talk about
> turning crawls into full basements. Not quite what I'm about.
>
> I know this will be expensive, but it might be the way to go for
> our situation. Having a new finished basement might be more
> cost-effective than moving, if it comes to that. We bought before
> the real estate price run-up of the last 5-6 years and couldn't
> afford to buy in our neighborhood today!
>
>
> Thanks for your time,
>
> Max
>
> PS: I crossposted to rec.woodworking mainly in the hopes of getting
> more input, but also because this effort might result in my own
> indoor
> shop space instead of an unheated garage. ;-)
>



Posted by J.A. Michel on July 4, 2007, 1:13 am

> We have an old basement that is about 6'6"" at it's highest point,
> with a block foundation. The floor is poured concrete, not flat,
> with the usual(?) small stress cracks.
>
> I was wondering about the feasibility of jacking up the house,
> removing the old foundation, digging a little deeper, and putting
> a new poured foundation with lots of (8'+) headroom.
>
> I am specifically -not- interested in just digging out the floor.
> I'd lose too much floor space that way, and I really would like to
> get rid of the old block walls.
>
> Anybody know anything about this?
>
> I've done some googling, and all I've found seems to talk about
> turning crawls into full basements. Not quite what I'm about.
>
> I know this will be expensive, but it might be the way to go for
> our situation. Having a new finished basement might be more
> cost-effective than moving, if it comes to that. We bought before
> the real estate price run-up of the last 5-6 years and couldn't
> afford to buy in our neighborhood today!
>
>
> Thanks for your time,
>
> Max
>
> PS: I crossposted to rec.woodworking mainly in the hopes of getting
> more input, but also because this effort might result in my own
> indoor
> shop space instead of an unheated garage. ;-)


It can be done. We had a house with a crawlspace, and looked seriously at
putting a basement under it. It was a 26'x48' ranch style house. We got
estimates, and a poured basement was going to cost $27,000. The housemovers
needed $12,000 just to jack it up and down. In the end, we ended up
building a new home complete with the basement we wanted.

If you go ahead with the project, get a basement with 9' walls. We did, and
it's nice to have the extra headroom. You might also want to add perimeter
drain tile and maybe even have the dirt treated for termites one the old
basement is gone, but before the new one is poured.

There's lots of things to consider with a job like this. Choose your
contractor carefully!

Good Luck!


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