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Old 04-08-2009, 02:17 PM   #16
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Dig out basement (lower floor)


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Originally Posted by Knucklez View Post
you might try search term "excavation"
well that's a smart idea... haha. I'll do that

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i'm thinking of similar project. but i will ask structural engineer his/her advice before i start project. also will get permit for this job too (mostly as 2nd opinion on critical reno).
I've actually spoken with a structural engineer and foundation expert, and they wouldn't tell me anything specific about how to do it.



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remember that you loose headroom when you finish the floor & ceiling.. so you need more like 3' lower to have 8' ceiling.

please post your project & what you learn along the way!

Knucklez

I actually had a blog up about building the second story on my house (complete with an insanely long narrative and lots of pictures of the progress). If anyone's interested, I can try to get it up again and post a link.

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Old 04-08-2009, 02:32 PM   #17
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Dig out basement (lower floor)


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I've been researching this for a while as well - if you want to have a quick demo, check out the video on HGTV.ca's Sarah's House, Season I:
http://www.hgtv.ca/sarahshouse/video.aspx?releasePID=RydxNTbcqGviL28Wxw9qGReDbYk5 UOYS
From what I've seen already, you need to dig out portions of the foundation one by one, consolidate with concrete and then proceed to a new portion, gradually completing the basement perimeter. I think only after that is done do you then dig out the main floor and re-concrete entire surface of the basement.
I tried to watch the video, but it wouldn't let me since I'm not in Canada!! Is it worth it for me to find a proxy server in Canada to watch it?

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I concur with Ron6519 - this is a very delicate job and I'm considering it myself for my house here in Montreal, but would NEVER attempt it on my own: playing around with the foundation of your home? Not without a full-blown warranty from a company that knows what it is doing!

You're probably right, and I haven't decided whether I actually want to do this on my own yet... one of the reasons I'm trying to get more info. I still haven't heard anyone say anything about attaching the new foundation/footing, or if it's even necessary.

One other thing I was thinking about... It seems to me that I wouldn't be able to guarantee I completely filled the void with concrete after digging under the footing, and therefore some settling would occur. What about not quite filling it all the way, and then packing the space with something? Anyone have any comments/suggestions?
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Old 04-08-2009, 02:45 PM   #18
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Dig out basement (lower floor)


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I've actually spoken with a structural engineer and foundation expert, and they wouldn't tell me anything specific about how to do it.
So you hired an engineer to help you & they wouldn't?

Or you were just looking for free advice ??
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Old 04-08-2009, 02:52 PM   #19
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Dig out basement (lower floor)


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So you hired an engineer to help you & they wouldn't?

Or you were just looking for free advice ??

Well I hired a structural engineer a while back to make sure my foundation could support the second story I built, but he didn't seem to be able to tell me anything more specific than what I've already said when I asked him about lowering the floor.

I also spoke with a foundation person about hiring him to draw me some plans for doing the work, but he said he wouldn't do it if I was potentially going to do the work myself. (And I don't need to hear from anyone that I should take that as a sign.... :P)
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Old 04-08-2009, 02:55 PM   #20
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Dig out basement (lower floor)


That is a sign
Most likely no-one will be responsible for telling you how to do this due to the risk involved with collapse
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Old 04-08-2009, 02:57 PM   #21
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Dig out basement (lower floor)


First off let me say that am not going to be responsible for what I write in the reply or any other reply on this forum. If I was that desperate for extra space I would probably do that to a basement but you should be aware that even if that basement doesn't leak water now it could when you dig another 3 feet down. You also have to be EXTREMELY CAREFUL when you go and possibly undermind the main structure of you house.
What I would do is dig a hole about 4 feet deep and 1 foot wide every 4 feet. I would then pour a footing about 2x2x1 foot deep. Do that all around you house and wait 30 days for it too cure. Then get some 6x6 pt post and cut them to fit between the new footing and the old footing. When you place them in be sure toplace it under the old wall and not just under the footing. You can now proceed to dig the rest down 3-4 feet. Make another footing in the area of 12"x6" deep. Pour a new wall directly under the old wall. It will have to come out past the footing to be able to get the concrete into the forms.( if you wall is 6"wide and the footing is 12"wide then you will have to go under the wall plus another 3 inches to come flush with the footing then another 3 inches to be able to get the concrete in there) Let that cure but in the mean time you can clean out the rest of the basement and pour a new slab. Again do not consider this good conprehensive advice. I would recommend building an addition as far as living comfort and cost go.

Last edited by joel v.; 04-08-2009 at 03:14 PM.
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Old 04-08-2009, 03:27 PM   #22
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Dig out basement (lower floor)


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That is a sign
Most likely no-one will be responsible for telling you how to do this due to the risk involved with collapse
Obviously I can't blame anyone for advice given to me here. I think there's even a disclaimer to that effect somewhere. But I do understand that no one wants to hear about a house collapse in Maryland after posting here, let alone with a body underneath.
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Old 12-29-2009, 10:39 PM   #23
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Dig out basement (lower floor)


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Originally Posted by caritimo View Post
I've been researching this for a while as well - if you want to have a quick demo, check out the video on HGTV.ca's Sarah's House, Season I:
http://www.hgtv.ca/sarahshouse/video.aspx?releasePID=RydxNTbcqGviL28Wxw9qGReDbYk5 UOYS
From what I've seen already, you need to dig out portions of the foundation one by one, consolidate with concrete and then proceed to a new portion, gradually completing the basement perimeter. I think only after that is done do you then dig out the main floor and re-concrete entire surface of the basement.
I concur with Ron6519 - this is a very delicate job and I'm considering it myself for my house here in Montreal, but would NEVER attempt it on my own: playing around with the foundation of your home? Not without a full-blown warranty from a company that knows what it is doing!
Hi Caritimo,

Have you done the work of digging the basement of your house in Montreal? I am looking into doing the same, can you give me any reference for the contractor...Thanks a lot
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Old 12-30-2009, 10:17 AM   #24
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Dig out basement (lower floor)


The plan is to do it summer 2010. I have started contacting contractors:
Henault & Gosselin
Bisson Experts
They came, but haven't provided quotes yet. They are considered the full service and expensive options. Their solution is a big job of digging underneath existing foundation either to reach bedrock or to place wide metal plates on top of which to pour concrete. Either method would obviously be done in sections.

I have also contacted an independent engineer who claims with his solution he could be half the price of the other two. His solution is to place jacks every 2m that would support house while digging the rest (it's more detailed than that, but I didn't quite understand it).

I am still mulling about what to do and I think I will continue searching for a few more options.

Good luck to you. Are you also in Montreal?
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Old 12-30-2009, 04:48 PM   #25
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Dig out basement (lower floor)


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If you could explain why you think that's a recipe for disaster, I would be very grateful.


Daniel
Its not clear what happened here, but appears to be something you should review:

http://www.contractortalk.com/f11/house-collapse-70196/

Steve
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Old 12-30-2009, 05:06 PM   #26
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Dig out basement (lower floor)


HI, I in South Shore. Thanks for your reference. I am planning to start mine around end of February before spring....but have not decided which contractor. THanks for you reply
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Old 04-19-2011, 01:41 PM   #27
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Dig out basement (lower floor)


I know this is old, But how did it go?
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Old 06-20-2011, 05:16 PM   #28
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Dig out basement (lower floor)


I've been thinking about this as well with my basement...found an AWESOME forum that had pictures start to finish.

http://www.avsforum.com/avs-vb/showthread.php?t=1235793

Hope that helps!
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Old 06-26-2011, 10:42 AM   #29
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Dig out basement (lower floor)


ya, i saw that post also and thought it was good. i have done a lot of research on this subject now and have a good feeling on the process involved. there is not a lot of info out there, you REALLY have to search. i have not found a single book on residential underpinging. another good website is http://www.contractortalk.com

i saw a another blog where it rained and then the holes for the underping were filled with water. that would FREAK ME OUT if i were in the process of underpinning and it got all soggy and wet. but the blog i was reading said that they called the structural engineer and he said it was no problem, but you can wet shop vac the water out so you can keep working.

i am still trying to learn how to deal with a chimney. looks like you underpin half of it, and then the other half.

also, how to deal with the sewage & water lines that are currently UNDER the foudation wall but will actually be in the area between the new footing and original foundation wall after underpinning process. are these pipes supposed to be surrounted with plastic ABS to create an air gap until the cement dries... and then fill with foam? remove ABS and fill with foam? none of the above? don't know yet.

this project is a long way away for me, so i got some time. post your pics if you already started!

Knucklez

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Last edited by Knucklez; 06-26-2011 at 10:45 AM.
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