What do I fill with?

[Mortsken]

working on fixing up the stairs.
I have rather large gaps that need to be filled before I can putty and sand.
What should I ideally fill these with? There should be something better than lots of layers of regular putty.

 

[Stefan N]

It will never be possible to putty that, you'll have to cover it with plasterboard or something.

 

[Mortsken]

I thought it would be plan B if the plastering doesn't go well. It extends less if the plastering succeeds. If it doesn't work, then it will be a panel, and in that case, it doesn't matter that it's plastered underneath.

 

[Kasken]

Thought it would be plan b if the plastering doesn't turn out well. Expands less if the plastering succeeds. If it doesn’t work, then it will be a board, and it doesn’t matter if it’s plastered underneath.

Is space really so limited that a 6mm gypsum board makes any practical difference? In my world, this is not even worth 2 seconds of thought...

 

[ArneTW]

Is there a wall that is removed?
what supports the stairs?

/ATW

 

[Leif i Skåne]

Is it a wall that has been removed?
what is supporting the stairs?

/ATW

Self-supporting structure!

 

[Mortsken]

Is it really so short of space that a 6mm gypsum board makes any practical difference? In my world, this is not even worth 2 seconds of thought...

Maybe not, will probably use a board anyway.
Had hoped to avoid the hassle of bringing one home.

 

[Mortsken]

Is it a wall that has been removed?
what holds up the stairs?

/ATW

There was no wall that had any bearing function.

 

[Mortsken]

It became a disc, and after much sanding and painting, it turned out like this.

 

[Tompafix]

Nice! But I definitely think you removed the wall that the staircase stringer rested on. It only goes down to the window now

 

[Mortsken]

Nice! But I'm pretty sure you've removed the wall that the stair stringer rested on. It just goes down to the window now

Possibly it was like that a long time ago. I haven't removed it. It was a closet made of very thin material, which wasn't load-bearing in any way. It's been like that since the '70s, so it should hold for a while longer.

 

[Tompafix]

Alright, I see. Maybe it's hanging on all the planks you placed the board on.

 

[Mortsken]

The boards are indeed attached to the stairs, and they continue upwards to form the wall on the upper floor. Then I assume they are attached to the wall to the right of the window, and they are also set in the beams in the ceiling/floor on the upper floor.