Replace 45mm studs with 70mm

[William1234]

Hello!

I have started a bathroom renovation and have just torn down all the drywall from the walls. Then I noticed that the studs in one of the interior walls are only 45x45mm. My question is whether there is a way to replace/reinforce the wall with 45x70mm studs without having to tear down the wall?

 

[Gabbe1]

Can't you just screw new standing 45x70 into the existing 45x45?

 

[Dowser4711]

It depends a bit on what type of wall you have on the other side and how it is attached.
That is, drywall, boards, concrete, something else? Nailed, screwed?
What kind of surface layer do you have on the other side? Painted/wallpaper that is due for a change anyway, tiles, or a new expensive wallpaper?

The easiest might be to complement the existing studs with 28x45 or similar on both sides that you screw and glue?

 

[William1234]

How will it be at the bottom and top of the wall then? Since I need the wall to be 70mm deep, the studs will stick out 25mm from the horizontal studs at the floor and ceiling?

 

[olofh]

You need to choose whether the bathroom should become smaller or if the room on the other side of the wall should shrink. So if the bathroom is not supposed to shrink, you'll also need to take down the wall the other way.

 

[Gabbe1]

What happens at the bottom and top of the wall then? Since I need the wall to be 70mm deep, the studs will stick out 25mm from the horizontal studs on the floor and ceiling, right?

Then you build on these horizontal studs as well.

 

[William1234]

You need to choose whether the bathroom should become smaller or the room on the other side of the wall should shrink. So if the bathroom is not to be reduced, you need to take down the wall in the other direction too.

You need to choose whether the bathroom should become smaller or the room on the other side of the wall should

It is okay if the bathroom shrinks a bit since tearing down the wall on the other side is not an option. What I want to do is somehow incorporate 70 studs in the existing 45 wall. So that I only lose 25mm in the bathroom.

 

[William1234]

It depends a bit on what kind of wall you have on the other side and how it is attached.
That is, plasterboard, boards, concrete, something else? Nailed, screwed?
What surface do you have on the other side? Painted/wallpaper that is due for replacement anyway, tiles, or a new expensive wallpaper?

The easiest may be to supplement the existing studs with 28x45 or similar on both sides that you screw and glue in place?

Unfortunately, it is not an option to tear down the wall on the other side.

 

[Dowser4711]

How will it be at the bottom and top of the wall? Since I need the wall to be 70mm deep, the studs would then protrude 25mm from the horizontal studs at the floor and ceiling?

Ah, I understood it as you wanted to maintain the wall's depth but increase stability, if you're only after the depth, you only need to mount 25/28x45 on the outside of the 45x45 you have now and ignore the ones I suggested earlier.
And as mentioned, place one at the bottom and one at the top.

 

[olofh]

It's okay if the bathroom shrinks a bit since tearing down the wall on the other side is not an option. What I would prefer is to somehow integrate 70 studs into the existing 45 wall. So that I only lose 25mm in the bathroom.

Then you can just place the 70 studs next to the 45s. Or you could extend the 45s, or use something like a fein to saw off the 45s from the inside, so to speak. But then there would be some plastering work on the other side.

 

[Dowser4711]

Unfortunately, it is not an option to tear down the wall on the other side.

If you only have screwed drywall with paint/cheap wallpaper, you can unscrew it (after some filler work) and then screw back a 45x70 without tearing down the wall. But it will look like crap before it's filled and painted/wallpapered again.

 

[William1234]

Ah, understood it as you wanted to maintain the wall's depth but increase stability. If you're just after the depth, you only need to mount 25/28x45 on top of the 45x45 that you have now and ignore the ones I suggested earlier.
And as mentioned, put one at the bottom and one at the top.

That would have been a good solution! Does this make the wall as stable as if it were a 70 mm stud from the start? Is it an "approved" way to build a wall?

 

[Dowser4711]

That would have been a good solution! Does this make the wall as stable as if it were a 70 mm stud from the beginning? Is it an "approved" way to build a wall?

If you screw and glue them, it will be more stable than a single 45x70.
By "approved," I suspect you mean with regard to BKR, Säker Vatten, or similar.
Then the most important thing is that your craftsman approves it, as it's their certification that matters in the end.

 

[egge80]

Glue and screw a 45x70 or 45x95 flat onto the entire existing one, so you won't have to deal with Sala and feina and everything that was suggested.