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Old 02-19-2012, 04:41 PM   #1
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jack post distance


just bought a house went down into the basement and found a jack post not installed there are 4 2x10 bolted together spanning the lenght of the house with 2 jack posts just wondering if anbody knows what the distance between them should be to a max

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Old 02-19-2012, 04:48 PM   #2
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jack post distance


Does not make a lot of since. First you say the post were not installed, then you say there's two of them. Do you mean there's was none in the center?
What do you mean by jack post? Lolley coloums?
Any pictures?

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Old 02-19-2012, 05:00 PM   #3
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there are three 2 of them installed 1 not they are Adjustable cylindrical steel posts (jack posts)
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Old 02-19-2012, 05:18 PM   #4
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jack post distance


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Originally Posted by armor View Post
just bought a house went down into the basement and found a jack post not installed there are 4 2x10 bolted together spanning the lenght of the house with 2 jack posts just wondering if anbody knows what the distance between them should be to a max
It depends on the distributed floor loading and how much deflection your floor material can stand between the jacks. The worst deflection is maybe L/240, for a span L of 240" you can stand 1" of deflection as measured at span center.
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Old 02-19-2012, 06:03 PM   #5
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I am still confused. You say there are two jack posts installed, and you found another not installed. Was it laying on the ground somewhere in the basement? Maybe it was never intended to be installed.

As noted by previous poster, the required spacing between posts depends on the load on the beam, and the size of the beam. I am not going to analyze your setup, too difficult to figure out the variables over the internet, but you really need to verify that the "jack posts" are designed for long term use. Many adjustable columns are designed for temporary use only. The ones rated for long term us should have a stamp on them with a load rating, and the name of the organization that certified the column for long term use.

You also need to verify that the foundation for the posts is adequate. A few pictures might help here.
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