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Old 07-31-2011, 10:24 PM   #1
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Post in concrete and getting plumb.


I was curious in a simple question. One of my plans were to build a shade structure where my BBQ grill would be. I have done repairs, and remodeling in the past and I am very handy. I have never set any post in concrete before. And my question is. If I went to put a 4x4 post in concrete as legs of a 2 legged pergola using obviously 2 4x4 post. When I put the post in the hole in the ground. Then pour concrete. I level and plum the post. Here is my question, after getting level and plum how does the post stay level and plum? Is the concrete thick enough to hold it in place so it can settle? Or do you have to brace it up. Assuming the post being used will be 11 ft high from ground level. Thanks! Love
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Old 07-31-2011, 10:35 PM   #2
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Post in concrete and getting plumb.


you tack 2 temporary braces say one pointing south and one going west to hold it plumb while the concrete sets unless you can jab a big stone in the hole to hold it while the cement sets up.

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Old 07-31-2011, 10:45 PM   #3
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Post in concrete and getting plumb.


Setting a post directly in concrete is usually a bad idea, since concrete attacks most wood. The usual procedure is to cast a bracket (Simpson makes a variety of them just for this purpose) into the concrete, and attach the post to the bracket. The bracket is galvanized steel, and holds the post about half an inch above the concrete. This keeps the post from getting wet at the bottom, and minimizes rot potential.
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Old 07-31-2011, 10:47 PM   #4
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Post in concrete and getting plumb.


Yep, Danny is right. Cut two pieces of 3' long 2x4 and then cut a point on one end of each. Hammer them into the ground about 4 feet way from the base of the post to the south and west and then run a 2x4 between the stake and the top of the 4x4 post. If you use duplex nails for this it makes it easy to disassemble.

Also, drive a few nails into the 4x4 where it will be in the concrete. It will hold those posts in the concrete really well.

Good luck,
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Old 08-01-2011, 09:09 AM   #5
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Post in concrete and getting plumb.


nice to know thanks. now will it be any different if it was a fence post? Being that it isn't as tall will it need bracing too?
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Old 08-01-2011, 09:29 AM   #6
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Post in concrete and getting plumb.


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nice to know thanks. now will it be any different if it was a fence post? Being that it isn't as tall will it need bracing too?
Both posts should be braced diagonally, whether you bury them in the ground(not a good idea) or use the brackets.
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Old 08-01-2011, 09:55 AM   #7
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Post in concrete and getting plumb.


sounds like using those brackets would be easier to do. using the brackets you won't need to brace anything right? Let the 4x4 post bracket set in the concrete of course try to level. then after its dry, level and plum post and screw it tight?
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Old 08-01-2011, 11:01 AM   #8
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Post in concrete and getting plumb.


Correct Fabian, however, there will be play in the post using that strongtie bracket so you will want to brace it while you frame.
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Old 08-01-2011, 01:43 PM   #9
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Post in concrete and getting plumb.


The structure as built, will require permanent lateral bracing.
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Old 08-01-2011, 02:12 PM   #10
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Post in concrete and getting plumb.


For crying out loud, this is a shade shelter over a grill..........

Set the posts in concrete, tar/wrap the below grade portion before setting them in concrete, and use it for 20-40 years before they posts rot away..............
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Old 08-01-2011, 02:15 PM   #11
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Post in concrete and getting plumb.


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For crying out loud, this is a shade shelter over a grill..........

Set the posts in concrete, tar/wrap the below grade portion before setting them in concrete, and use it for 20-40 years before they posts rot away..............
So should he rent a boom lift to set the joists?
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Old 08-01-2011, 02:17 PM   #12
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Post in concrete and getting plumb.


I'm just waiting for someone to tell him he needs to consult a structural engineer to re-invent the wheel for him..................
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Old 08-01-2011, 03:38 PM   #13
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Post in concrete and getting plumb.


It might be nice if Fabian stated the shade material he was contemplating. And maybe the rest of the structure overhead.
Frankie Avalon would have.
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Old 08-01-2011, 03:41 PM   #14
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Post in concrete and getting plumb.


I had to google that reference.
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Old 08-01-2011, 03:57 PM   #15
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Post in concrete and getting plumb.


Well it was just a shade structure... lets say...
4x4 post. 11 high' two of them about 8 feet apart, 2 by 8's connecting the 2 4x4 up top. then 2x4 every 16 inches up top on like a 35 degree angle or so... nothing major.. then maybe some hawaii type of feathery roof top cover. those hairy things that they have at retreats... i forgot the name, i just saw it used last night on a show too.

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