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RE: Residential Foundation Tipping

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The floor system is wood floor trusses that span 30’ (max), rather than your typical TJI/BCI engineered wood products, with 0.75” sub-floor.  It’s a one story house with furnished basement, so there was no apparent damage on the main level.  There did appear to be some damage at the corner of one interior wall (“crushing”) which would indicate additional deflection of the floor structure.  It could also be that the house settled after it got furnished and the deflection is finally showing through.  It’s isolated damage to one area, and there are other walls, so I tend to believe it’s an isolated instance.


Dave Maynard

Gillette, WY

From: Michel Blangy [mailto:mblangy(--nospam--at)]
Sent: Friday, June 20, 2008 1:15 PM
To: seaint(--nospam--at)
Subject: RE: Residential Foundation Tipping


Is there any evidence of floor system buckling at the top of the wall level?

-----Original Message-----
From: David Maynard [mailto:d_maynard(--nospam--at)]
Sent: Friday, June 20, 2008 11:07 AM
To: seaint(--nospam--at)
Subject: RE: Residential Foundation Tipping

Foundation wall is 9’-3” tall.  There is a basement slab on grade on the inside.  It is backfilled the height of the wall on the outside, minus the top 6”.


David Maynard

Gillette, WY

From: Rhkratzse(--nospam--at) [mailto:Rhkratzse(--nospam--at)]
Sent: Friday, June 20, 2008 12:04 PM
To: mblangy(--nospam--at); seaint(--nospam--at)
Subject: Re: Residential Foundation Tipping


I *assumed* it's a basement wall.


In a message dated 6/20/08 11:01:53 AM, mblangy(--nospam--at) writes:

I love these kinds of things. I used to work for an veteran engineer who got these calls from colleagues a lot.
So there is no lateral earth pressure on either side of the wall, correct? Is there a SOG present on either side?

-----Original Message-----
From: David Maynard [mailto:d_maynard(--nospam--at)]
Sent: Friday, June 20, 2008 10:38 AM
To: seaint(--nospam--at)
Subject: Residential Foundation Tipping

Got this call earlier this week.  Like to hear what everyone has to say.
It’s a residential foundation, 9’-3” wall on top of 8” by 16” continuous footer.  Reinforcing unknown.  The wall is actually tipping into the building.  Anchor bolts on the outside have broken the concrete out at several locations.  Soils report says it’s a sandy-clayey-silt.  Took samples from the surface and brought to another dirt-engineer who, at sight and touch, believes it to be a lean or fat clay.  *shrug*  Jury is still out on this one.  Current landscaping is exposed backfill, or NO landscaping at all.  There is a perimeter sub-drain (one of those perforated pipes surrounded by Styrofoam peanuts in a mesh sock) around the base of the foundation.  House, and wall where damage exists, is about 100 feet away from the base of a hill.  There appears to be positive drainage away from the house.
I have my own suspicions as to what could have happened, but I am curious if anyone has run into this on their end.  Anyone?  Anyone?  Foundation damage that I have typically seen is either settlement and heave.
Dave Maynard, PE
Gillette, WY

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