ᐅ Fill vertical 7 cm thick and 20 cm deep slot in load-bearing wall.
Created on: 8 Jul 2020 12:59
K
Kr4pf3n
Hello experts,
I am currently facing a challenge and think this is a question for the masons in this forum.
I had to replace the electrical wiring in a two-family house. After careful analysis, it became clear that the 4-core 10mm² (10.7 AWG) cable also needed to be replaced with a 5-core 10mm² (10.7 AWG) cable. So, the cable was replaced from the basement up to the first floor. For this, the walls had to be channeled open with a slot about 7cm (3 inches) wide and 2.75m (9 feet) high. In the 1970s, the cable was simply embedded directly in the wall during construction. Now I have two fairly large slots in load-bearing walls in two apartments that obviously need to be repaired.
This is where I need advice from the experts among you.
How can I restore the maximum stability of these walls?
Have the slots significantly weakened the walls, considering they are vertical?
There are also quite a few cables inside the wall now: two main cables plus six NYM 2.5mm² (≈14 AWG) cables. Will they cause any problems when closing the slots?
As a “layperson,” I would have simply filled the slot gradually from bottom to top with expanding mortar, to apply some pressure on the whole structure. Or is that rather counterproductive?
I would appreciate some digital support from you.
Thanks in advance and best regards,
Sebastian
I am currently facing a challenge and think this is a question for the masons in this forum.
I had to replace the electrical wiring in a two-family house. After careful analysis, it became clear that the 4-core 10mm² (10.7 AWG) cable also needed to be replaced with a 5-core 10mm² (10.7 AWG) cable. So, the cable was replaced from the basement up to the first floor. For this, the walls had to be channeled open with a slot about 7cm (3 inches) wide and 2.75m (9 feet) high. In the 1970s, the cable was simply embedded directly in the wall during construction. Now I have two fairly large slots in load-bearing walls in two apartments that obviously need to be repaired.
This is where I need advice from the experts among you.
How can I restore the maximum stability of these walls?
Have the slots significantly weakened the walls, considering they are vertical?
There are also quite a few cables inside the wall now: two main cables plus six NYM 2.5mm² (≈14 AWG) cables. Will they cause any problems when closing the slots?
As a “layperson,” I would have simply filled the slot gradually from bottom to top with expanding mortar, to apply some pressure on the whole structure. Or is that rather counterproductive?
I would appreciate some digital support from you.
Thanks in advance and best regards,
Sebastian
Oh my goodness!!!
If the structural engineer has put you under pressure, you’re so thoroughly hammered that you’ll fit right into the groove.
Don’t ask amateurs. Go straight to the structural engineer. There’s a good reason why you’re only allowed to chase grooves up to 30mm (depending on the wall thickness) deep in load-bearing (vertical) walls.
If the structural engineer has put you under pressure, you’re so thoroughly hammered that you’ll fit right into the groove.
Don’t ask amateurs. Go straight to the structural engineer. There’s a good reason why you’re only allowed to chase grooves up to 30mm (depending on the wall thickness) deep in load-bearing (vertical) walls.
Kr4pf3n schrieb:
He said you could rebuild it nicely using expanding mortar and by removing the bricks.Absolutely fantastic, the title of a fitting Duröhre video – I assume by a classmate of the original poster – can be found with the search term "Stuffing expanding mortar over steel beams – livestream from the construction site." I haven’t had this much fun in a long time. Really top-notch, maestro. Or as it says around 24:10 in "Dannmallos - DIY": "but the result is simply fantastico."https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
Kr4pf3n schrieb:
I spoke with a mason. He said that using expansive mortar and removing the bricks could also nicely rebuild it. I would like to bring this up for discussion. Filling a hole successfully does not mean that the wall’s structural properties have been restored.
I don’t understand why you would need a structural engineer here. The ceiling should be supported using steel pipe props. The vertical slot is not an issue; even in load-bearing walls, cables and conduit pipes run through openings as wide as the walls themselves. However, the larger opening to the right of the wall should be properly removed so that whole bricks can be used again, preferably with a higher density. It shouldn’t be patched up as it currently looks. And your trusted bricklayer should definitely be capable of doing this. In my company, it’s routine work to support load-bearing walls, install beams and lintels, and ensure stability. For larger openings, a structural engineer is necessary. But in your case, nothing is being altered; it’s just being restored to its original condition, and the load-bearing wall remains load-bearing.
Mürker13 schrieb:
The vertical slot is not an issue; even in load-bearing walls, cables and conduit pipes the same width as the walls are routed vertically. I don’t see a structural engineer involved here—rather, a textbook example of a DIY joke that even grandma with no glasses would see comes from someone who clearly isn’t from a practical trade. Enough to make me laugh out loud—although just a week ago, I thought I already knew every East Frisian joke.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
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