How to brick up against an intermediate floor

[spaxx]

Hello,

I'm planning to build a room in the basement with Leca blocks, and I would like it to be load-bearing/stabilizing for the walls and floor above.

Currently, I have a basement ceiling made of pine. Should I build up to the ceiling, or does it need to be able to move?

Could I cut into the ceiling where the Leca meets, and place a 45x145 beam that meets the Leca walls?

How should I do it?

 

[spaxx]

No one with guidance?

 

[Stefan N]

In any case, I would have made sure that the wall was against something other than a pine ceiling if it's going to be a load-bearing wall.

 

[spaxx]

Hello,
Yes, I will place a 145mm against the ceiling and make sure it aligns properly with the beams.

The question is if there might be any issues if I "clamp" the existing ceiling under such a 145mm.

 

[GK100]

It is reasonable that you remove the surface layer, panel, etc., in the strip you connect to the new wall so that you reach the main construction with your stud. Not that it couldn't work technically under the right conditions, but if you're doing the work anyway, make sure it's done well and not sloppily.

 

[spaxx]

Thank you

 

[MagHam]

If you look at an older house, these partition walls may be built directly against the ceiling without any problem.

 

[MathiasS]

These partitions are often built up to the sub-ceiling of raw particleboard, rarely against the finished surface.

Expose sub-ceiling/beam, nail a strip of roofing felt, build the wall, do a top casting.

 

[spaxx]

Hmm how do you do a top casting if you can't access it from above? I can only access it from the side.

I could set the circular saw against the ceiling and cut with the right depth on the blade, so I hit the joists, then I can attach a 45x120mm or 45x145mm and cast against it.

 

[MagHam]

Is it okay to be curious...
Are you building an open fireplace, or opening up a garage on the floor above?

 

[spaxx]

haha, I am going to build a laundry room under a bathroom and under a guest room, and new walls will then be built to separate in the basement.

 

[MagHam]

At the top, leave a few centimeters, set up a support from one wall side, and insert mortar with a narrow trowel from the other side.

Place a small pile of mortar on a trowel that you hold upside down horizontally and insert from, so it goes quite quickly.

I don't know any other way.

 

[spaxx]

Aha okay, should the mortar be mixed a little coarser so it doesn't spread out as easily and collapse then? That doesn't sound so tricky.

Between the rule that I would be building up to in that case, should there be any sliding layer in between? Like sill paper/thick asphalt strip with a sanded surface?