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undermined footing

Discussion in 'Residential Foundation Codes' started by ICE, Oct 15, 2016.

  1. ICE

    ICE Sawhorse

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    A new sewer trench has created an issue with the footing. The footing is about 6" thick and is shallow.
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  2. steveray

    steveray Sawhorse

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    P2604.4.......?
     
  3. Keystone

    Keystone Sawhorse

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    Been there, done that, engineer repair was flowable fill.
    Yes, they opted for an engineer over moving the sewer...
     
  4. fatboy

    fatboy Administrator

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    That's what I would require, engineers evaluation.
     
  5. ICE

    ICE Sawhorse

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    I gave them the option of back fill with a compaction report or slurry. I didn't see a need for an engineer.
     
  6. conarb

    conarb Sawhorse

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    Tiger:

    Is that one of those post-tensioned slabs with a thickened perimeter? If so you definitely need an engineer who knows about post-tensioned slabs. You can tell by looking at the edges of the slab, there should be about 2" concrete plugs about 12" o.c. where they tightened the cables.
     
  7. ICE

    ICE Sawhorse

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    It isn't. When did post-tensioned hit the market? When I was a kid I worked around pre-stressed beams.
     
  8. conarb

    conarb Sawhorse

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    Tiger:

    Sometime in the 60s, it works well above grade but when they tried putting it on the ground to eliminate footings and "float", they "floated" all over the place with whole buildings going out of level, doors sticking, windows not working, etc.
     
  9. Keystone

    Keystone Sawhorse

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    I've seen post tension once, an ice rink.

    I believe several years ago someone attempted to have post tensioning in the codes. My understanding of post tensioning, used in locals with expansive soils, etc...
     

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