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Old 11-16-2010, 09:14 PM   #1
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Steel post in concrete


Hi I am building a pergola in south Florida. I have an existing patio slab. I have two questions, I am planning on using 3x3 galvanized steel posts 3/16 thickness.
I would like to know what the gurus think.

1. Should I bolt the columns to the slab using 4 anchors per post. Or should I cut footings in the concrete slab, and dig a 40 inch footing, and place the post in the concrete.

I am leaning towards cutting the concrete and placing the footer into the concrete. Should I worry about the posts rusting at the base. Should I seal the top of the tube, to prevent water from gathering in the tube. What should I know about before embarking down this road. Thanks in advance.

Alex

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Old 11-17-2010, 06:04 AM   #2
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Steel post in concrete


With the prospect of hurricanes and that pergola becoming airborne, I would set the posts in concrete. And use tie brackets on everything, which is also tied to the posts.

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Old 11-17-2010, 08:23 AM   #3
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Steel post in concrete


Thanks - thats what I figured, Now with the galvanized steel posts, the tube is hollow, Do I need to cap the end sticking out of the ground, so that moisture does not enter the tube. When sticking the posts in the concrete, once I have the concrete in the footing, Will I just be pushing the tube into the concrete or have the post in the concrete and pour around it. If I pour around the post wont the center of the post be empty? Thanks

Alex
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Old 11-24-2010, 09:17 AM   #4
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Steel post in concrete


Maybe you should think about using aluminum posts. I live in South Florida s well, and I have steel columns supporting my patio. They are rusted and are in need of replacement.
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Old 11-24-2010, 01:19 PM   #5
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Steel post in concrete


Years ago, I worked in a machine shop who's primary customer was a company who made metal awnings and whatnot. Primarily everything was aluminum, but I remember distinctly that they took a 2 way approach to metal posts: They were capped at the top to stop the water getting in, and drilled at the bottom to let the water out. No matter what you do, sooner or later water will probably find a way into the post, and its best if it has a way out.
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