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Old 01-19-2012, 12:55 PM   #1
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Ran into footing while moving plumbing under slab.


I am expanding my master bathroom and trying to install a trench drain in the new walk in shower as well as moving the toilet over. While breaking up the slab for the plumbing I have ran into a footing with 1/2" rebar running through the center of the house. The house is constructed with 2x4 truss roof and has no load bearing walls inside the house. Even if there was a need for a footing due to a load there is no wall in that location. It just runs through the middle of the room. I should also note there is no sign of the plastic pipes that would contain tension cables. This footing is located exactly were the drain will be and I need to remove at least half of it to continue. Is there a reason I am missing for the presents of this footing?

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Old 01-19-2012, 01:00 PM   #2
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Ran into footing while moving plumbing under slab.


It would be unusual for a contractor to deliberately build a footing that was not necessary, due to the expense of such an activity. As for not running into plastic pipe for tensioning cable, do you have a particular reason for suspecting the house is built with post tensioned or pre-tensioned steel? As in perhaps you looked a the plans? Or maybe some of the houses in your area are built that way?

As for knowing why there is a footing, no one on this forum has divining skills, so I suggest you hire an engineer or experienced contractor to look at your specific situation and assess what the role of that footing is. Or maybe discuss with the building inspector, they might be familiar with techniques and construction practices in your area, wherever that may be.

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Old 01-19-2012, 01:14 PM   #3
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Ran into footing while moving plumbing under slab.


No real reason for suspecting of pre-tension cables other than I had a friend that said some older homes were commonly built with them. This house was built in the early 70's.

I will give the local building inspector a call and see if he is familiar with something like this. Trying to avoid the expense of hiring an engineer to move a drain but may not have a choice to do it right. I figured I would give it a shot here to see if there was some common type of building construction that would use this layout that I am not aware of. Its got everyone I've asked baffled.
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Old 01-19-2012, 01:14 PM   #4
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Ran into footing while moving plumbing under slab.


Quote:
Originally Posted by Daniel Holzman View Post
It would be unusual for a contractor to deliberately build a footing that was not necessary, due to the expense of such an activity. As for not running into plastic pipe for tensioning cable, do you have a particular reason for suspecting the house is built with post tensioned or pre-tensioned steel? As in perhaps you looked a the plans? Or maybe some of the houses in your area are built that way?

As for knowing why there is a footing, no one on this forum has divining skills, so I suggest you hire an engineer or experienced contractor to look at your specific situation and assess what the role of that footing is. Or maybe discuss with the building inspector, they might be familiar with techniques and construction practices in your area, wherever that may be.
+1, contractors are definately not known for going "above and beyond"...
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Old 01-19-2012, 01:31 PM   #5
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Ran into footing while moving plumbing under slab.


So the house has absolutely no interior load bearing walls? There are no jack posts in the basement. Have you dug along side it to see if you can determine whether it continues through the length of the house?
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Old 01-19-2012, 02:44 PM   #6
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Ran into footing while moving plumbing under slab.


The whole house has 2x4 truss construction and has an open floor plan through a majority of it. No sign the truss above this location is any different than the rest. It is a single story with no basement. Only thing previously installed in this area that will now be the shower was a simple 60,000 BTU furnace on a 2x4 platform. Not very heavy and was actually to the side of the footing not over it. I have removed about 5 feet along the footing and found an intersecting footing about 12" wide that runs through the middle of the existing bathroom a foot in front of where the toilet was. The plumbing in the house was all cast iron so no sign that it has ever been changed since it was built.

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