Jack post inside foundation wall...

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Old 08-16-11, 09:19 AM
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Jack post inside foundation wall...

I am thinking I am going to cut 2 large windows into a basement 8 inch thick concrete foundation wall. I could cut one large opening if I could put a jack post in the center of the opening and then install windows on either side.

Is it possible and/or smart to put a jack post inside of an opening in the concrete wall? I am wondering if I would have issues drilling into the concrete to bolt the post with possible cracking?
 
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Old 08-17-11, 07:40 AM
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How large are the windows? I would think a header would be needed.
 
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Old 08-17-11, 08:03 AM
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Header for sure, I was just trying to keep the forum post succinct.

One detail I missed was that the concrete wall is 8 inches thick.
 
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Old 08-17-11, 08:03 AM
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I don't think you can use a jack post as a permanent structural component. I know I can't in my area. You can cut a lally post to fit but there are other, easier options.

You need to put in a header properly sized for the opening.
 
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Old 08-17-11, 08:40 AM
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What is the difference between a jack post and a lally post?

Also what are these other easier solutions?
 
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Old 08-17-11, 08:52 AM
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Jack post inside foundation wall...

I have a large opening in a load bearing, 8 inch thick poured concrete exterior basement wall. Do you think I could install a jack post under a header within the opening in the wall?

I am concerned if I drill into the concrete it may split since it is only 8 inches thick and the jack post plates are 6" wide...
 
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Old 08-17-11, 05:38 PM
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Adjustable Steel Columns

According to that site jack posts shouldn't be used for that purpose because the diameter is less than 3 inches. It also doesn't show a difference between jack & lally. If you are not filing plans with the building dept, then you can do whatever you want. I wouldn't worry about the block splitting since you can patch that at the end of the job.

Did you open the wall without installing a temporary header?
 
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Old 08-18-11, 09:36 AM
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Yes I did, it really isn't that much of a load. If it was even close I would have put up a temporary brace. Whenever I do these type of jobs I just like to overbuild them just to ensure I don't have to worry about strength.

Thanks for the article, it actually says they are legal in Canada - and that is where I am. I see jack posts holding up beams in every basement here. Still not sure if they would be OK in an exterior wall though - rust being a concern too. Leaning towards just using a couple of 2x8s now anyway - would be a 100 times easier.
 
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Old 08-18-11, 02:57 PM
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The 2x8s sound good.
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