Hello!

I hope to get some answers and help with my thoughts.
We are renovating the bedroom in our first house, so we are a bit novice.

We have decided on a few things that we preferably don't want to change.

Today, we've torn out everything, and the only thing left is a 3mm thick plastic mat on the floor, which is chipboard.
Then plastic at the rafters.

This gives a ceiling height of 2420mm.

We've bought some materials.
Partly 14mm parquet that will be laid with a 2mm foam.
Then the ceiling will consist of Elittak panels that are 12mm thick.
These are 12x300x1200.

So these need to be fastened at 300cc.

The wardrobes are very decided. They should be 236cm high wardrobes, with doors and not sliding doors.

My problem here is that IKEA, for the wardrobes, says that 237mm is required to assemble the wardrobes standing up.

If I use 28x70 as I've understood is standard when the rafters are at 1200cc.

Then I get a ceiling height of 2364mm.
If I assemble the wardrobes before laying the floor, we get 2380mm and then can assemble them.
But I became worried that if they lean even slightly, the doors will then hit the ceiling?

But the idea was that if I can use 21x70 if it's enough, then you get a height of 2371mm.
And should thus be able to assemble them after the floor is laid.

The ceiling has a weight of 8kg/m2 and the room is 15m2.
So it's about 120kg of ceiling.

What do you all think here?
What would you do in my position?

I absolutely do not want lower wardrobes. And I preferably do not want to skip laying the floor under the wardrobes either...

I hope to get some support and help here.
And hope I've put this in the right forum section!

Thanks in advance!
/Robin
 
Would say that it's a bad idea. Not to space with 21x70, that might work. But having doors that go right up to the ceiling, I think is asking for trouble. Cut down the wardrobe at the bottom, a 20mm lower plinth doesn't matter, does it? With a plunge saw on a rail, it's easily fixed. With the reservation that I don't know exactly what the wardrobes look like.
 
21x70 on rafters with c/c 1200 will not be good. Use 21x170 boards instead, it will be entirely comparable to 28x70.
 
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J justusandersson said:
21x70 on rafters with c/c 1200 won't work well. Use 21x170 boards instead, it will be completely comparable to 28x70.
Thanks!
Don't you think it might work if you assemble the wardrobes before laying the floor and then put them on the floor?

Or is it maybe because they require the level up to be able to open the doors, etc.?

Could one potentially use 21x145?
Feels very wide with 170 haha!

How much difference is there in strength?
 
My general experience is that you shouldn't have too small margins on the height. I don't know if that's relevant here. 21x170 matches 28x70 to 100%, that's how I calculated it. In terms of stiffness, 21x145 is at 70% of these dimensions. One option is to take 21x95 and cut it in half and then glue it back together. A bit of a project, but it should work well.
 
Well, that's how it is with margins. Hence, I probably need to go with some form of "gles" with 21mm thickness so I get a finished 237.1cm, which leaves 1cm of clearance above the finished wardrobe.

Can a stiffness of 70% be enough to support the ceiling with 120kg over a total of 15m2?

And should one use, for example, 4.5x60mm screws to hold them up?

Splitting it sounded too complicated haha, but out of pure curiosity, does the board become much stiffer just because it's split and then glued?
 
Keep in mind that floors and ceilings are never completely straight and level. It doesn't take much for a few mm of margin to disappear.

I once assembled 8 Ikea 236 wardrobes on an upper floor with a ceiling height of about 237 cm. As I recall, the frames were 2365mm high. It ended up with me having to cut most of the frames at the bottom for it to work out. Not a problem in itself, but a bit of extra tinkering.
 
N nybyggarn3 said:
Also consider that floors and ceilings are never completely straight and level. It doesn't take much for a few mm of margin to disappear.

Once, I installed 8 Ikea 236 wardrobes on an upper floor with a ceiling height of about 237 cm. As I recall, the frames were 2365mm high. It ended with me having to trim most of the frames at the bottom to make it work. Not a problem in itself, but a little extra hassle.
That can be the case...

I think I'll do it this way.
I'll space with 21 instead according to justus's answer.
Then hope it works; otherwise, trim 1cm off the base as a last resort.

Would you remove the plastic mat I currently have at the bottom?
It's glued to the chipboard... feels like it could take pieces of the chipboard with it and just create more work?
That it's a lot of work for only gaining 3mm?
 
A amoreex said:
does the board become much stiffer just because it is split and then glued?
Yes.
I think you need at least 50 mm screws for 21 mm thick boards.
 
J justusandersson said:
Yes.
I think you need at least 50 mm screws for 21 mm thick boards.
great!

now I'm asking out of pure stinginess.
Will 145s suffice or should I go for 170 to be on the safe side?

sorry for being annoying and repetitive.
 
Does it work to space at 150 cc instead? With 21x70 then
 
V Vovve_ said:
Does it work to space at 150 cc instead? With 21x70 then
unfortunately can't screw into those studs anyway. If I don't want visible screws...
 
Even 28x70 is no marvel of rigidity. I would go with 21x170.
 
J justusandersson said:
Even 28x70 is not a marvel of stiffness. I would go for 21x170.
Okay!
I'll simply go with that!
Just hope byggmax will take back the timber..
Today I went and picked up 28x70 without thinking...

Thank you so much Justus, you're a star!
 
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