Hello!
I am in the early stages of building a new basement wall. There was previously a basement entrance there, but I'm planning to close it up and fill it with soil.

I plan to use concrete blocks (250 mm wide). The wall is 4m long and 1.9m high.
What do you think about the horizontal forces if I build a support wall in the middle of the new concrete block wall (and does it need to reach all the way up, or is 2/3 enough)? Or should I place L-support in front of the wall?

I was thinking of drilling in rebar into the existing walls on both sides and reinforcing every third layer, or should I reinforce more?

And one last question about the support wall. Should it be built simultaneously with the wall interlocking, or should I build the wall first and then the support wall?
Thanks for the insightful thoughts
/G
 
Hello,

Assuming you fill outside the wall with Leca Lättklinker (weight 4 kN/m³), you can either lay masonry reinforcement every other course or reinforcement steel every third course. The Lecawall is built all the way out to the walls and up to the floor slab. Weber has design guidelines for Leca Block where it states, among other things, how to reinforce/build depending on the wall geometry and different fill materials outside the wall.

Not entirely sure if you would keep the existing wall or not, as well as what you mean by support wall, but I think it looks like below. It's also possible to demolish the existing outer wall and build up the Lecawall there instead. It also works to place prefabricated L-supports outside, or alternatively T-supports. I believe the breaking point from L-support to T-support is at a depth of 2 m.
 
  • Blueprint of basement wall construction, showing Leca block wall with dimensions: 4m wide, 1.9m high, including floor and ceiling support structure.
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