Hump in concrete basement floor

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  #1  
Old 12-26-14, 08:05 PM
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Hump in concrete basement floor

Hi everyone. I have a concrete basement floor in a house built in 1913. There is a 12 in x 12 in square hump about 1 in off the ground. It is about 2 ft from a drain in the floor. We are carpeting the basement and I would like to grind down this hump to make it flat, but I don't know what is underneath or what it could be. Anyone ever seen anything like this (picture attached), or have any ideas/suggestions as to what it could be? Thanks in advance for your help!
 
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  #2  
Old 12-26-14, 08:27 PM
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Welcome to the forums.

Could it possibly be an old footing ?
 
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Old 12-27-14, 04:42 AM
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It could be a repair area or a footer as PJmax mentioned. Grind it down and hope you don't hit anything.
 
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Old 12-27-14, 06:51 AM
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Old footing is what I would guess as well. What is above that bump? Is there or was there a beam or is this bump in line with other supporting posts?

Look at all of the sewer lines to judge whether any may be passing under the floor in that area. It doesn't look like a sewer access, but they sometimes include a cleanout.

Bud
 
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Old 12-27-14, 07:01 AM
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Thanks for the help. If it is an old footing, would it be safe to try to grind it down so it is flat? Could I do any damage? Or is it better to add some cement to round it off? Thanks again.
 
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Old 12-27-14, 08:05 AM
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Ok, I definitely think it is an old footing because upon second look, there are similar (but flatter) bumps in line with this one. Do you think it is safe to try to grind the cement over it?
 
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Old 12-27-14, 08:14 AM
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It's fine to grind this down but if it's an old footing and there are more, I would be taking a quick look up to see if I could figure out what this used to support and whether there are any concerns about posts having been removed.
 
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Old 12-27-14, 08:16 AM
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You should have no problems removing that if it's an old footing. It may take a little grinding or a hammer and chisel to break up.
 
  #9  
Old 12-27-14, 08:46 AM
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That will be a lot of grinding. One option I have used is a diamond blade for my circular saw. I built a simple frame around the area to be removed so I could slide my saw back and forth at the desired depth. I then cut blade width grooves about every 1/4" and used a cutoff tool to chip away the remaining. For that small area a hammer and chisel would be fine. Then a flat grinder finished it off very nicely.

Not sure what you have for tools. Be prepared for a ton of dust so vent the area and wear a good face mask.

Bud
 
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Old 12-27-14, 08:59 AM
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I'm kind of lazy. I'd rent a small electric pavement breaker (jack hammer) and chip out enough to make it about two inches deep then fill with concrete to floor level. Be very careful as you break it up there is nothing under the first two inches.
 

Last edited by ray2047; 12-27-14 at 11:05 AM.
  #11  
Old 12-27-14, 09:27 AM
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Has that drain been abandoned or is it still active? Wondering if carpet is a good idea for that area.
 
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