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
Hausbauer20217 Aug 2023 12:42xMisterDx schrieb:
No, that was not discouraged. What was discouraged was screwing the fence onto the top of the L-shaped blocks because there is simply very little material to hold the screws.
Screwing from the back could also work, but you must absolutely avoid drilling too deep 😉
And it’s better to use one screw too many than too few. In my original post, I did mention that I ordered the L-brackets for the L-shaped blocks. These can only be screwed from the back or with just one screw from the top. I assumed that this method was the one discouraged.
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Hausbauer20218 Aug 2023 10:16This is what the brackets look like. That would naturally be much easier. However, if there is a risk of them pulling out, I would prefer to use concrete instead.
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WilderSueden8 Aug 2023 14:10How much distance is there between the hole and the edge? I would be very cautious with less than 10cm (5 inches) edge distance, otherwise the anchor might cause the concrete to crack.
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Hausbauer20218 Aug 2023 14:28The top two holes are definitely smaller. They are centered on the L-block. They measure about 5cm (2 inches). The lower hole is 12cm (5 inches).
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Hausbauer202129 Aug 2023 19:58Quick update:
You were right, of course. The fence on the L-shaped concrete blocks would have been way too high. We have now set it to 1.2m (4 feet) and gradually raised it with the blocks. It fits perfectly, and you don’t have to look at such a tall fence. Attached is a photo of our ground. I can only deepen the rear posts with a lot of effort. The hole measures 60 x 50 x 70cm (23.6 x 19.7 x 27.6 inches) (70cm (27.6 inches) deep but only 50cm (19.7 inches) will be filled with concrete). But if I put concrete in there, it should harden with the rocks, so nothing should happen, right? All other posts were concreted with about 200–250 kg (440–550 lbs) of concrete. Thanks again.
You were right, of course. The fence on the L-shaped concrete blocks would have been way too high. We have now set it to 1.2m (4 feet) and gradually raised it with the blocks. It fits perfectly, and you don’t have to look at such a tall fence. Attached is a photo of our ground. I can only deepen the rear posts with a lot of effort. The hole measures 60 x 50 x 70cm (23.6 x 19.7 x 27.6 inches) (70cm (27.6 inches) deep but only 50cm (19.7 inches) will be filled with concrete). But if I put concrete in there, it should harden with the rocks, so nothing should happen, right? All other posts were concreted with about 200–250 kg (440–550 lbs) of concrete. Thanks again.
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