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.
W
WilderSueden6 Aug 2023 10:35Frost depth depends on how frost-sensitive the soil is. With our clay soil, it is probably around one meter (3 feet). However, for a fence post, it is not always necessary to go fully below the frost line. And once you reach solid rock, you can stop digging.
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xMisterDx6 Aug 2023 11:12It’s not just about frost. The foundation must withstand the torque that your fence applies to the ground during strong wind loads.
If it isn’t deep enough, the concrete foundation will simply rotate out of the soil, like a spade when you apply pressure to its handle end. The force of a metalworker using leverage can be tremendous...
If it isn’t deep enough, the concrete foundation will simply rotate out of the soil, like a spade when you apply pressure to its handle end. The force of a metalworker using leverage can be tremendous...
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WilderSueden6 Aug 2023 20:20Of course. But it’s not only the depth that matters. The foundation’s footprint and especially the ground itself also have an impact. Natural soil, compacted gravel, loose drainage gravel, or “whatever leftover excavation material was available”...
Where the foundation sits directly on rock, usually the bond between the concrete and the rock should be sufficient. If desired, you can drill some holes and insert reinforcing bars to ensure nothing gets pried loose.
Where the foundation sits directly on rock, usually the bond between the concrete and the rock should be sufficient. If desired, you can drill some holes and insert reinforcing bars to ensure nothing gets pried loose.
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hanghaus20237 Aug 2023 11:42Why don’t you screw the posts directly from the back onto the L-bricks?
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Hausbauer20217 Aug 2023 11:46hanghaus2023 schrieb:
Why don't you screw the posts directly from the back onto the L-bricks?It was advised against because of the wind loads. Just to clarify the starting situation:
During the house construction, the area where there are no L-bricks has already been excavated down to the rock or slate. The holes for the posts have to be made using a demolition hammer. Does this still mean a depth of 80cm (31.5 inches)?
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xMisterDx7 Aug 2023 12:34No, that was not discouraged. What was discouraged was screwing the fence onto the top of the L-shaped stones, because there is simply very little "material" to hold onto there. 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.
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