ᐅ Double wire mesh fence with privacy screen mounted on L-shaped concrete blocks—feasible?
Created on: 1 Aug 2023 12:09
H
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.
Hausbauer2021 schrieb:
The neighbor has exactly the same, but made entirely of wood. Has the neighbor checked if that is allowed?
I know many zoning plans where that is not permitted facing the street.
H
Hausbauer20212 Aug 2023 10:37I don’t know if he checked that. But it’s a T-junction street with 50 houses. If necessary, I’ll dismantle it or make it lower 😀
X
xMisterDx2 Aug 2023 11:26Do not underestimate the wind load that a fence has to withstand. My neighbor just "lost" a fence because he thought he knew better than the manufacturer, who recommends a concrete footing of at least 30x30x80 cm (12x12x31.5 inches) for each post. I doubt that a few anchors set into thin L-shaped bricks can survive a storm. The leverage on a 2 m (6.5 ft) high fence is enormous.
What is the downside of setting the fence posts with proper concrete footings behind the L-shaped bricks?
What is the downside of setting the fence posts with proper concrete footings behind the L-shaped bricks?
H
Hausbauer20212 Aug 2023 12:12xMisterDx schrieb:
Don’t underestimate the wind load that a fence has to withstand. My neighbor just lost a fence because he thought he knew better than the manufacturer, who recommends a concrete footing of at least 30x30x80cm (12x12x31½ inches) for each post. I doubt that a few anchors set into thin L-shaped blocks would survive a storm. The leverage on a 2m (6½ ft) fence is huge.
What’s the downside of installing the fence with proper concrete footings behind the L-blocks? The problem, at least in the corner area, is the height. The post would have to be 4m (13 ft) long to be able to embed 80cm (31½ inches) of it in concrete. Behind the L-blocks, I would install it like that. Also, keep in mind that we won’t enclose the entire fence, just the area parallel to the street. The "initial" corner part will remain open, and tall plants will be placed in front of the L-blocks. We’re not talking about plastic wall plugs here 😀 The heavy-duty anchors we’re using are also employed in industry for impact protection. Forklifts weighing several tons often collide with them and come to a hard stop 😀 So those anchors can handle quite a lot. Still, I’m not 100% certain about the wind load. I think I’ll do it this way first without installing all the privacy slats. Then I’ll wait until autumn. If everything holds fine, I’ll add another slat or maybe leave it as is if it’s not too bothersome 😀
X
xMisterDx2 Aug 2023 12:47Why did you install the L-shaped blocks if you don’t plan to backfill up to ground level? You could just as well set the footings directly into the backfilled soil.
We’re not talking about wind here, but gale-force gusts. And since you want to place the fence right next to the road, that’s quite a risky experiment...
I’m familiar with concrete anchors. We also use them to hang cable trays. But in those cases, we drill into solid concrete walls, not into 120mm (5 inches) wide L-shaped blocks. I wouldn’t bet that doing that won’t just crack the concrete if things go wrong.
We’re not talking about wind here, but gale-force gusts. And since you want to place the fence right next to the road, that’s quite a risky experiment...
I’m familiar with concrete anchors. We also use them to hang cable trays. But in those cases, we drill into solid concrete walls, not into 120mm (5 inches) wide L-shaped blocks. I wouldn’t bet that doing that won’t just crack the concrete if things go wrong.
Similar topics