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Old 03-24-2013, 03:47 PM   #1 (permalink)
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How to attach a 4x4 to a concrete block wall

I need to attached some pressure treated 4x4s to an existing block wall that is my current back fence.

I want to top of the fence with something taller because its only about 5' tall right now and i am tired of looking at my neighbors while in my backyard.

4x4's will be attached vertical about 2ft from the top and extend about 3ft over the top. from there I am going to attach some redwood or something.

Anyway, block is 4' with 6" pillars every 12' or so. I plan to attach the 4x4's to the 4' blocks that make up the main part of the wall because they are hollow and therefore easier to drill into.

Was thinking of a toggle type fastner but wondering if that would hold up to a good wind. I was thinking 2-3 fastners per board.
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Old 03-24-2013, 03:58 PM   #2 (permalink)
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There are a few type of fasteners for putting bolts into concrete.

But MOST city's won't allow an 8' fence.

You may put it up and just have to pull it down again.
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Old 03-24-2013, 03:58 PM   #3 (permalink)
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Old 03-24-2013, 03:58 PM   #4 (permalink)
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Old 03-24-2013, 04:01 PM   #5 (permalink)
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Old 03-24-2013, 04:04 PM   #6 (permalink)
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This would be the incorrect way of doing it.





and I would imagine this would work out best, due to modularity.




I still don't agree with it, since this example can be installed backwards.
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Old 03-24-2013, 04:09 PM   #7 (permalink)
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I vote toggles if the blocks are hollow.
I would look up your Municipal codes on max fence height and take the boards to that height.
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Old 03-24-2013, 04:49 PM   #8 (permalink)
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This would be the incorrect way of doing it.





and I would imagine this would work out best, due to modularity.




I still don't agree with it, since this example can be installed backwards.
Just make sure that the 4x4 isn't a rockbouncer.
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Old 03-24-2013, 05:59 PM   #9 (permalink)
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Just make sure that the 4x4 isn't a rockbouncer.
As long as you air it down it'll be fine.
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Old 03-24-2013, 06:21 PM   #10 (permalink)
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As long as you air it down it'll be fine.
But a REAL rock crawler could actually make it over the wall.
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Old 03-24-2013, 06:25 PM   #11 (permalink)
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I need to attached some pressure treated 4x4s to an existing block wall that is my current back fence.

I want to top of the fence with something taller because its only about 5' tall right now and i am tired of looking at my neighbors while in my backyard.

4x4's will be attached vertical about 2ft from the top and extend about 3ft over the top. from there I am going to attach some redwood or something.

Anyway, block is 4' with 6" pillars every 12' or so. I plan to attach the 4x4's to the 4' blocks that make up the main part of the wall because they are hollow and therefore easier to drill into.

Was thinking of a toggle type fastner but wondering if that would hold up to a good wind. I was thinking 2-3 fastners per board.
anchor bolts and a hammer drill. I wouldn't put them in any hollow concrete though.
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Old 03-24-2013, 06:30 PM   #12 (permalink)
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Old 03-24-2013, 06:35 PM   #13 (permalink)
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Fence height here is 6ft. without a permit, and 8ft with a permit, if they will issue it. Went through this crap a few years back and left the fence at 6ft. after I was told the permit would be based on the cost of my materials and labor. Had no idea that is how it worked.
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Old 03-24-2013, 06:46 PM   #14 (permalink)
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If it is hollow, can you cement them into the openings?
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Old 03-24-2013, 06:49 PM   #15 (permalink)
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Hollow? Plant em from the top. Or run them from the ground up. What's the force the fence will have to hold from wind?
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Old 03-24-2013, 06:58 PM   #16 (permalink)
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I live in central California so there are no tornado style storms around here. A few times a year it'll get windy pretty good.....maybe 35mph or so.

My back fence backs up to a trailer park that was once a nice retirement type place but they have let it turn into a meth head palace.

I really doubt that anyone would ever turn me into the city so I am not worried about that. Besides the trailer that sits behind me is already on the same damn fence, which is what i am trying to hide from view.

Most of the topcaps are too lose and many are missing to top mount. Already looked into that. I am not sure how I would cement them into place since I need to get into the second course or so.
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Old 03-24-2013, 07:07 PM   #17 (permalink)
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Old 03-24-2013, 07:14 PM   #18 (permalink)
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As long as you air it down it'll be fine.
Will it have less tire spin?
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Old 03-24-2013, 07:32 PM   #19 (permalink)
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Drop in anchors into the web wi 3/8 bolts.
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Old 03-24-2013, 07:34 PM   #20 (permalink)
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Even better drill right through the block and attach with 3/8" all thread and
fender washers.
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Old 03-24-2013, 07:39 PM   #21 (permalink)
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Even better drill right through the block and attach with 3/8" all thread and
fender washers.
This.
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Old 03-24-2013, 07:42 PM   #22 (permalink)
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Had another idea. Blocks mortar and rebar are cheap. Knock the top caps off and add another course or three.

Less Ghetto as well

Last edited by Snowbird13; 03-24-2013 at 07:43 PM.
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Old 03-24-2013, 08:41 PM   #23 (permalink)
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Old 03-24-2013, 09:55 PM   #24 (permalink)
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are you talking hollow block like cinder blocks?

if so, have fun putting a 3 foot wall up with only 2 feet supporting it every 12 feet. thats a decent bit of leverage to apply to a product not meant for the design your using.
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