Every now and then I run into something I have never seen before, like a floating foundation!

Brick facade house, nice addition on the side, masonry block foundation connected to the main house with a right angle.  Plenty of crawl space vents.

So far so good.

But when I got into the house, and looked into the crawl space I noticed that the last 5 concrete blocks of support are literally floating in the air!

Interestingly the other side was the same way!

Having never seen it before I shot off an email to an engineer friend of mine, with photos.

He had seen this before, saying that the construction crew left a hole there so they had more easy access to and from the crawl space under the room. 

Then they filled it in later. 

The sink hole bothered me too, beginning where you are looking and continuing down to just under where I am taking the photo.  That sink hole is about 6' deep!

The engineer said that moisture intrusion is the ultimate problem with this, and that he likes to see them finish by putting concrete under that floating portion, to help control water flow.

I sent his answer to my clients.  They had a couple more days in which to ask further questions if they wanted.

My recommendation:  when you see something odd or that you have never seen before, ask questions!  I never have a problem saying that I don't know something and will attempt to find out a valid answer.  My clients always appreciate that, and yours will too.

 

 

Jay Markanich Real Estate Inspections, LLC  

Based in Bristow, serving all of Northern Virginia

www.jaymarinspect.com


 
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23 Comments on Floating Foundation

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APR
16
2012
670,111 Points 8 Featured Posts Outside Blog Hit Router Called Shot Master

Morning Jay and that sir is one of the many reasons why I go to AR so I can learn things new.  Most every day someone tells me something I didn't know and today is one of those days

4:03am • #4
975,795 Points 351 Featured Posts Attended Rain Camp Called Shot Master

I could not detect a lintel Jeff, but the engineer says it works structurally.  Soil does seem to be eroding away, on the sides and near the house.

Hard to see from directly above, this is an upside-down volcano and about 6' deep.

And the engineer says it isn't recommended and prefers that concrete underneath.

It is apparently done all over, it's just that I had never seen it and doing this for 31 years that would indicate it's fairly rare around here.

But I found an answer!

And you are right, those blocks are heavy!

4:07am • #5
975,795 Points 351 Featured Posts Attended Rain Camp Called Shot Master

I'm glad James.  That's why I am on AR too - I learn a lot!

4:08am • #6
275,890 Points 17 Featured Posts Localism Sponsor Attended Rain Camp Called Shot Master

Wow!  That would take you sit up and take notice.  Yet another example of water intrusion and the problems it can cause!

4:09am • #7
975,795 Points 351 Featured Posts Attended Rain Camp Called Shot Master

Kathryn - structurally it seems sound and has been there for 12 years.  But the erosion is a second issue, and the one that had me bothered the most.

4:25am • #8
1,951,048 Points 478 Featured Posts Localism Sponsor Attended Rain Camp Called Shot Master

All things considered, it wouldn't take an engineer to tell me that this is a risky home purchase.  Any structure that is offered for sale with an unrepaired "sink hole" is far riskier than my risk tolerance.

The engineer who said he had "seen it before" compared  it to a similar sink hold but without knowing the actual cause.

Living in Loudoun County, my first question would be "what's UNDER that sink hole?"  We have an entire area of  Loudoun County down route 15 north of Leesburg where the limestone overlay area is full of sink holes and they are not something one wants under their home or near their well.

Goodness.  Never a dull moment in the life of a home inspector.

Lintels are fine, but, again, I'm not comfortable with them as a "repair" or "fix" for what could be a continuing erosion problem. 

Yes, I'm severely risk averse.

4:42am • #9
495,603 Points 29 Featured Posts Outside Blog Called Shot Master

I would always be concerned, when I saw a sinkhole. That would need to investigated further.

I have heard the term "floating foundation" before, but never really undstood what that meant.

Thank you for sharing the post with all of us.

4:56am • #10
975,795 Points 351 Featured Posts Attended Rain Camp Called Shot Master

Which is why I contacted him Lenn.  He lives out near you!   I did his home inspection!  In my opinion it was a pretty deep sink hole.  He wanted to fill it and stop the erosion with concrete under the wall.  I think that hole has happened over time.

Joe - I had not seen this before, but sink holes are just that.  And probably still sinking!

5:34am • #11
177,838 Points 2 Featured Posts

I guess if you live long enough you'll see most evverything. Notice I said most? =:o) Was there any other indications of defects caused by the unsupported areas?

7:34am • #12
228,216 Points Outside Blog Attended Rain Camp Called Shot Master

Jay -- if the sink hole is 6' deep now, and the home has only been there 12 years, in a couple of years, with some normal heavy rains, they may have enough open space under the house to frame in a basement.

9:40am • #13
975,795 Points 351 Featured Posts Attended Rain Camp Called Shot Master

No, Doug, nothing.  That was one thing it had going for it, no movement in 12 years.

Steven - the sink hole bothered me a lot.  That's why the engineer said to try to control moisture intrusion.

10:46am • #14
917,068 Points 178 Featured Posts Outside Blog Attended Rain Camp Called Shot Master

Jay, bridging spans like that with poured concrete is a no brainer---but with concrete blocks?

6:37pm • #15
APR
17
2012
779,231 Points 97 Featured Posts Outside Blog Called Shot Master

Interesting find Jay, sounds a bit wierd but if the engineer is okay with it...

12:28am • #16
975,795 Points 351 Featured Posts Attended Rain Camp Called Shot Master

Like I said Charlie, I have never seen it before.  Nor the sinking like that.  It was baffling enough that I sent them to an engineer.

Tom - he did say it was not recommended.  Beyond that, seeing it before doesn't make me feel better, but they are the clients and they can think for themselves after hearing from me and an engineer.

12:55am • #17
567,910 Points 140 Featured Posts Outside Blog Called Shot Master

That is odd. I would think it has to be a problem over time structurally due to erosion. Did you notice any settling any where? 

3:27am • #18
975,795 Points 351 Featured Posts Attended Rain Camp Called Shot Master

None Jim, in 12 years.  But, as the engineer said, the structure might be sound, but not recommended.  Sinking soil can never help!

3:28am • #19
548,445 Points 3 Featured Posts Outside Blog

Jay, I have heard of some huge sink hole in Quebec, but have never seen one (or heard of one) around here...

1:17pm • #20
975,795 Points 351 Featured Posts Attended Rain Camp Called Shot Master

Sink holes happen all over, in small scales Chris.  It happened near here in the middle of a road!

4:09pm • #21
1,912,808 Points 386 Featured Posts Localism Sponsor Outside Blog Attended Rain Camp Called Shot Master

Jay, hope this will be the only floating foundation you find this week!  See you Saturday.

7:40pm • #22
APR
18
2012
975,795 Points 351 Featured Posts Attended Rain Camp Called Shot Master

Any foundation of Webster Street has likely been there for a while Pat!  And I don't remember seeing one before anywhere!

2:37am • #23

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Jay Markanich - N. Virginia Home Inspector

Bristow, VA

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Jay Markanich Real Estate Inspections, LLC

Address: 12315 Sherborne Street, Bristow, VA, 20136

Office Phone: (703) 330-6388

Cell Phone: (703) 585-7560

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