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Old 05-27-2015, 06:16 PM   #1
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Fence


had a guy look at putting up a 8ft high privacy wall that will be 8 inch blocks. The wall is free standing and will be 100 ft long. He told me I would need footings 12 inches deep and 24 inces wide.
Some other sub contractors I talked to said that 12 inches wide and 12 inches deep would be all that would be needed
any thoughts
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Old 05-27-2015, 06:22 PM   #2
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Re: Fence


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had a guy look at putting up a 8ft high privacy wall that will be 8 inch blocks. The wall is free standing and will be 100 ft long. He told me I would need footings 12 inches deep and 24 inces wide.

Some other sub contractors I talked to said that 12 inches wide and 12 inches deep would be all that would be needed

any thoughts

I done my wall with 8" blocks and done a 8" base with type 57. It's only a total of 5ft high but the wall it holding up fine. 12" base should be deep deep enough and wide enough but I would say 24" would be nicer as when I done mine when o got to a corner I wanted to move the first course back a bit but couldn't as I only done 12" wide.

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Old 05-27-2015, 07:46 PM   #3
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Re: Fence


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Originally Posted by manofsteel View Post
had a guy look at putting up a 8ft high privacy wall that will be 8 inch blocks. The wall is free standing and will be 100 ft long. He told me I would need footings 12 inches deep and 24 inces wide.
Some other sub contractors I talked to said that 12 inches wide and 12 inches deep would be all that would be needed
any thoughts
I think all that would depend on your location and the soil conditions.

If you have expansive soils but are considered high bearing soils then maybe a deeper than wide footing is in order.
If you have medium or low bearing soils then a wider footing might be the ticket.
Sandy soil with not much chance of frost heave then 12 x 12 might do it.

If it is on the moon then no footing is required and just go one block down.


Andy.
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Old 05-27-2015, 10:15 PM   #4
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Re: Fence


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I think all that would depend on your location and the soil conditions.
and seeing what other similar types of jobs they have done in that area.
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Old 05-29-2015, 09:46 PM   #5
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Re: Fence


its all about frostlines and expected loads, next thing is legality of the 8ft, as far as i know most place have a 6ft rule.
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Old 05-30-2015, 08:24 AM   #6
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Re: Fence


Tall unsupported wall....I would not gamble with saving a few bucks on the footing. Do you have a frost consideration? I would be looking at deeper. Are there going to be any expansion joints in the wall?
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Old 05-30-2015, 08:50 AM   #7
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Re: Fence


Where are you located? I want to keep an eye on the local news for when this thing falls over...

That's a lot of surface area for the wind to catch.
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Old 05-30-2015, 09:38 AM   #8
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That's a lot of surface area for the wind to catch.
He could be wanting to put a fence on his property and not have the expense of renting or the energy of manually digging holes and/or just assemble it and be done. Windbreak fences are just plopped down too, but they're temporary, so that's why they do it. And they're also braced on each side the whole length--which wouldn't look good in this guys yard.
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Old 05-30-2015, 10:55 AM   #9
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Re: Fence


I just did one about 30' long & 6' high.

Footing is 3' wide x 2' deep, w/ a #5 cage.

#5 verticals @32" oc & #4 horizontal in every other course.

Then it was grouted solid.

8' tall will likely require a difficult to obtain variance.

Why is there seem to be such an aversion to hiring appropriate engineers for projects. Especially ones a tad out of the ordinary like this.

An engineer takes in to account soil conditions, and various other factors such as seismic, wind, snow loads etc etc.....as appropriate to the job and conditions.
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Old 05-30-2015, 02:25 PM   #10
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Re: Fence


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Why is there seem to be such an aversion to hiring appropriate engineers for projects. Especially ones a tad out of the ordinary like this.
speaking of variances, my bet is there's also a setback rule and/or someone doesn't want to go down where utilities can be located. If you plop down a huge priv-acy fence on top of the dirt, can do right to the lot line. The only concern then is which side of it will it fall on when it falls.
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Old 05-30-2015, 10:17 PM   #11
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Re: Fence


Just curious... why do some ho threads get closed and other don't?
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Old 05-30-2015, 10:40 PM   #12
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Re: Fence


The reason for no engineer is that it is "just a fence" . Even though it's a butt load of money, I don't want to spend any more!
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Old 05-30-2015, 10:45 PM   #13
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Just curious... why do some ho threads get closed and other don't?
Good point....
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Old 05-30-2015, 10:46 PM   #14
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Re: Fence


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