ᐅ Double wire mesh fence with privacy screen mounted on L-shaped concrete blocks—feasible?
Created on: 1 Aug 2023 12:09
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Hausbauer2021
Good morning,
I have already read several threads on this topic, but every case is a bit different. As the headline says, I want to install a 1.8m (6 feet) fence with privacy screening on L-shaped concrete blocks. For this, I ordered various brackets (L-shaped with 12.5mm (0.5 inch) elongated holes) that are specifically designed for this purpose. Now, after reading other threads, I’m a bit concerned about the wind load. Originally, I planned to fix the brackets with 10mm (0.4 inch) heavy-duty anchors and also glue them in. Our L-blocks are 12cm (5 inches) thick and have been cast in concrete. I assume they should be strong enough. After what I’ve read, I would now use 12mm (0.5 inch) heavy-duty anchors. In addition, I would use two rows of a slightly wind-permeable privacy screen. Is this plan still too risky or feasible? The fence will be attached not only to the L-blocks but also extend a bit further. Would it help if I set posts every 1.25m (4 feet) instead of every 2.5m (8 feet) and cut the panels to fit?
Attached is a picture of the situation.
Thank you very much.
I have already read several threads on this topic, but every case is a bit different. As the headline says, I want to install a 1.8m (6 feet) fence with privacy screening on L-shaped concrete blocks. For this, I ordered various brackets (L-shaped with 12.5mm (0.5 inch) elongated holes) that are specifically designed for this purpose. Now, after reading other threads, I’m a bit concerned about the wind load. Originally, I planned to fix the brackets with 10mm (0.4 inch) heavy-duty anchors and also glue them in. Our L-blocks are 12cm (5 inches) thick and have been cast in concrete. I assume they should be strong enough. After what I’ve read, I would now use 12mm (0.5 inch) heavy-duty anchors. In addition, I would use two rows of a slightly wind-permeable privacy screen. Is this plan still too risky or feasible? The fence will be attached not only to the L-blocks but also extend a bit further. Would it help if I set posts every 1.25m (4 feet) instead of every 2.5m (8 feet) and cut the panels to fit?
Attached is a picture of the situation.
Thank you very much.
H
Hausbauer20213 Aug 2023 20:31schubert79 schrieb:
Opaque curtains? Pleated blinds? You’re not building a fence only to remove it later. No, I will only remove the privacy screen (plastic in the fence), not the fence itself 😉
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Hausbauer20213 Aug 2023 20:37Tolentino schrieb:
How far is the L-block wall from the property boundary adjacent to the street?
I see the following problem:
There is no space for a proper foundation in front of the L-blocks.
Even if you disregard the underground boundary, as you mentioned, you need a 4m (13 feet) post at the "tall end." That post will have significant leverage, so technically you would need an even larger foundation, or the post thickness might not be sufficient.
That’s why I suggest positioning the anchors behind the L-blocks and embedding them in concrete.
At the "tall end," you can make the foundation about 80cm (31 inches) deep as usual (and theoretically even embed the posts there).
Later, the foundation can be shallower but longer and wider. At the front, you could even remove the L-blocks and pour a deep foundation underneath, then connect everything with long screw anchors (bonded in).
That would be the very secure approach for those who want maximum safety.
I would probably just fasten the last posts on shallower concrete pads (or alternatively concrete blocks). Those weigh about 100-150kg (220-330 lbs).
If the rest of the fence is properly founded, it will hold because it’s all connected. That’s how I plan to do it. I will set the posts in proper concrete foundations in front of the L-blocks (basically in the garden). I will try to use about 0.05-0.1 m³ (1.8-3.5 cubic feet) of concrete per post. Hopefully, that will last the next 30 years 😀 Can I place the posts directly against the L-blocks? Or should there be some distance?
Hausbauer2021 schrieb:
Or does there need to be some gap there? To prevent the good L-block from being affected by the poor quality of the mixed concrete? In my opinion, segregation is unnecessary. Those who are paranoid can leave an expansion joint.
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Hausbauer20213 Aug 2023 21:08Tolentino schrieb:
So that the good L-shaped block is not spoiled by the negative effects of the mixed concrete? In my opinion, segregation is unnecessary. Paranoid builders can leave an expansion joint. 😀 ok perfect, then I'll do it that way! Thanks a lot to you all!X
xMisterDx3 Aug 2023 21:47The main thing is that your foundation goes deep enough. It should be at least 80cm (31 inches), considering leverage forces and such.
Good luck!
Good luck!
H
Hausbauer20216 Aug 2023 09:37Hello,
I just wanted to quickly follow up and ask if the 80cm (31 inches) depth applies to all soil classes? On our plot, we have class 6-7 (shale/rock), and I can only make the holes using a rotary hammer (except for the area where the L-shaped blocks are backfilled). Should we still go 80cm (31 inches) deep there? That’s quite a tough job without an excavator 😀
I just wanted to quickly follow up and ask if the 80cm (31 inches) depth applies to all soil classes? On our plot, we have class 6-7 (shale/rock), and I can only make the holes using a rotary hammer (except for the area where the L-shaped blocks are backfilled). Should we still go 80cm (31 inches) deep there? That’s quite a tough job without an excavator 😀
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