B
I'm thinking about how to proceed with building my new bathroom on the upper floor of the house. I've removed the walls from the previous bathroom where I intend to build a new larger bathroom. Previously, the bathroom floor was elevated, but now I want to run the plumbing within the joists. In the picture, I've marked where the proposed wall should go. Ideally, I'd like to recess the particle board in some way to avoid having too high of a threshold to the bathroom.

How can I do this in the best way? Should I cut the boards at no. 2 and lay the particle board up to that point and live with the fact that it will be at a higher level, or can I solve it another way?

All suggestions are welcome :)

Best regards, Carl
 
  • Damaged floor with exposed pipes and debris, marked with red lines and numbers indicating planned wall and floor adjustments for a bathroom renovation.
First and foremost, you will probably need to block between the floor joists to support the wall... Are you planning to use a vinyl floor or tiles? What are the dimensions of the joists? Span between supports? How stable/swaying is it currently?
 
What are your plans to the left of the drawn wall? Is it a problem to make alterations to the floor planks that are there?

Spontaneously, I think about clearing the floor planks in what will become the bathroom and up to the first batten that lies outside the bathroom (that is, outside the marked wall, hence the question above). Then you can access the entire floor structure for reinforcement (at least if tiles) and pipework.

If height is critical, there are constructions where you place the subfloor between the floor joists rather than on top.
 
B
There lies a bedroom, and the floorboards have just been sanded and oiled. So I don't want to tear up more than necessary. It probably leans towards removing the boards up to the last floor joist and laying chipboard on the rest.

Joists are about 700mm center-to-center. How thick do the chipboards need to be?

Bernieberg Bernieberg said:
What are your plans to the left of the drawn wall? Is it a problem to make alterations to the floor planks that are there?

My initial thought is to clear the floor planks in what will become the bathroom and up to the first joist that is outside the bathroom (i.e., outside the marked wall, hence the question above). Then you access the entire beam structure for reinforcement (at least if tiles) and piping.

If height is critical, there are constructions where you lay the subfloor between the floor joists rather than on top.
 
B
Then I really understand that you don't want to tear and wear more than necessary.

Can you answer the questions from arkTecko and perhaps upload some more overview images to make it easier to give tips?

Floor chipboard is normally 22 mm, and that thickness is not to be seen as a variable. You have to adjust the joists instead to achieve sufficient rigidity.
 
B carlkarlin said:
I read on GVK that you can reinforce the joist with lightweight fill. ([link]) I could do that so the height of the new floor does not exceed the height of the floor joists. But the question still remains how I do it under the new wall :/
That might be a good method, but I don't see how it's advantageous for keeping the build height down compared to filling the joist with "regular" insulation? The top of the floor joists is where it is.

A thought about the joist at the new wall: It looks like the new wall will land approximately midway between two floor joists, and I definitely think you should try to get a good support in the joist. If you were to cut the existing wooden floor along the new wall ("on the bedroom side"), maybe you could manage to insert noggings in the pocket, fastened with joist hangers on the bedroom side and through the beam on the bathroom side. Would that be a feasible solution?
 
The easiest for you might be if you can move the wall further into the bedroom, so that it lies directly over the next floor joist to the left. Is that possible?
 
B
I will check if I can reach the beam under the bedroom floor and if I can use it to make a reinforcement under the new wall.

What I meant by gaining better construction height with EPS is that the floor drain would be level with the top edge of the floor beam instead of the height that chipboard and gypsum build above the floor beam.

Unfortunately, it is not possible to move the wall in the bedroom further, nor in the bedroom on the other side, as it would become too narrow. Attached is a floor plan with the new walls marked in red.

Bernieberg Bernieberg said:
It might be a good method, but I don't see how it is advantageous for keeping down the construction height compared to filling the joists with "regular" insulation? The top edge of the floor beams is where it is.

A thought regarding the joists at the new wall: It looks like the new wall ends up roughly midway between two floor beams and I definitely think you should try to get a good support in the joist. If you were to cut off the existing wooden floor along the new wall ("on the bedroom side") perhaps you could manage to insert blocks in the bay, attached with joist hangers on the bedroom side and through the beam on the bathroom side. Would that be a feasible solution?
 
  • Floor plan showing a layout with new walls marked in red. Includes rooms and staircase, illustrating potential construction changes.
B carlkarlin said:
What I meant by getting better building height with EPS is that the floor drain would be at the height of the top of the floor joist instead of the height that chipboard and plasterboard build above the floor joist.
Aha, so you apply self-leveling compound directly on EPS and joists? That is height-efficient then.
 

You just need to think about the load-bearing capacity of the floor structure.
 
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