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Old 11-08-2008, 08:58 AM   #1
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Footing for Column


I need to add a column in the basement for reconfigured staircase and floor space above. what size area should I cut out from the basement floor and how deep should the footing be?
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Old 11-08-2008, 09:11 AM   #2
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All the column footings that I have put in over the years where all spec. out by the architects to be 2'x2'x1' . providing it is in a basement. Hope this was of some help. BOB
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Old 11-08-2008, 09:21 AM   #3
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Thanks, that helps. I want to sound like I know what I'm talking about when talking to the building inspector.
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Old 11-08-2008, 10:00 AM   #4
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The size is entirely dependant on what it will be holding up.
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Old 11-08-2008, 11:18 AM   #5
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The size also depend on what is under it (quality of soil). That is why is is a spread footing to spread the load from above out. - Bad soil or loose clay means a bigger footing.

If you are lucky ($-wise), you will get a dumb inspector that will accept the prescriptive standards and not have enough sense to ask for a signed design. That may not be the best in the long run.
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Old 11-08-2008, 01:30 PM   #6
 
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bob, joe, & dick're all right,,, our footings're always 1'0 deep but include 2 mats of #5 bar - usually 3'0x3'0 in local soils,,, spread footings're common, too,,, need to know how much is above AND will the soil handle the static AND dynamic load.

IF there's ANY question, having a pro engineer stamp'd design's cheap insurance - i trust those guys MUCH more'n the avg municipal employee.
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Old 11-08-2008, 02:59 PM   #7
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I'm not trying to get out of doing the right thing but I'm also not too worried about the load. It's a small floor section I'm supporting. With our new double turning staircase, I need to support 2 sections of floor of that are 3x8'. So using a standard 10/40 load with tributary of 4' and 40lbs/linear foot for wall with a tributary of 5.5' the total weight on the post will be 1440 lbs.
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Old 11-08-2008, 04:29 PM   #8
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If I were you I'd ask the inspector if they'd be ok with a 24x24x12" pad with two mats of bars 6"oc each way. Personally, I'd make you get an engineer to specify it, but your inspector might be "nicer" than I am.
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