Build an additional layer of concrete blocks

[JF.]

I need to build an additional layer of lecablock outside the existing wall.
Do I need to reinforce the new lecablocks with the existing lecablocks?
Or is it sufficient to have mortar on the back of the new lecablocks and press them against the existing ones?

 

[jonaserik]

What is the point of building on the thickness of it?
A photo of how it looks says more than words. A bit difficult to say something remotely. But normally with an extra wall outside, you should anchor into the old one. Suitable with 6 mm rebars drilled into the old wall at 45 degrees and bent straight out, the outer part bent at 90 degrees and embedded between the courses on the new one. Depending on the height, it's fine to anchor between the first and second courses, (bottom anchoring) and then every third course. Approximately 1 - 1.5 meters in length is the rule of thumb for anchors. Then it will stay in place. Now we don't know anything about the size or length/height of your existing wall.

 

[JF.]

What is the purpose of building on thickness.
A photo of how it looks says more than words. It's a bit difficult to say anything from a distance. But normally with an extra wall outside something, you should anchor it to the old one. Suitable with 6 mm rebar that is drilled into the old one at 45 degrees and bent straight out, the outer part bent at 90 degrees and embedded between the courses on the new one. Depending on the height, it's enough to anchor between the first and second courses, (bottom anchoring) and then every third course. About 1 - 1.5 meters along the length is like a rule of thumb for the anchors. Then it will stay in place. Now we know nothing about the size or length/height of your existing wall.

It's just about aesthetics, the wall is 120x40cm.
Drill in the joint then? Otherwise, it will be difficult with the rebars. Anchor with anchoring compound or is it not needed?

 

[jonaserik]

No mass is needed, just drill at 45 degrees about 20 cm in with a 6 mm drill, bend the järn as I wrote, it's fine in the joint. For the anchor to be able to come out, the entire wall must collapse. PS if you have something else in järnväg, you can use it, as long as it can be bent, the anchor just needs to hold so it doesn't fall. Scoop on mortar between the blocks so that it becomes like a homogeneous wall. Good luck.

 

[JF.]

No mass is needed, just drill at 45 degrees about 20 cm in with a 6 mm drill, bend the iron as I wrote, works well in the joint. For the anchor to come loose, the entire wall would have to collapse.
PS if you have something else in iron you can use it, as long as it can be bent, the anchor just needs to hold it so it doesn't fall. Trowel mortar between the blocks so it becomes like a homogeneous wall. Good luck.

Thank you for the good and detailed answer 😃 Have a nice evening!

 

[JF.]

Thanks for the good and detailed response 😃 Have a nice evening!

Isn't it enough to place one anchor in the middle per row?

 

[jonaserik]

Could work with that as well, but it's best to have one on each side. If it was only 40 cm wide, it would work. 120 cm, so one on each side. This and with mortar between the walls ensure there won't be moisture between them and freeze apart. Preferably a form of cap on the top is good.