Floor on top of IKEA bed.

[sblixten]

We have an Ikea bed that looks like this below.
Now my wife has decided that it should become a den/playhouse on top of it.
I'm considering replacing the beams on the long sides with 120mm ones and then laying a board on top.
The board will be 90x200cm.
Can a plywood board handle that with 5 kids jumping on it, or how do I do it?

 

[Lolle]

I would probably have wanted to have a beam in the wall as a main support and then build a framework of studs resting on this beam and on the bed's "legs" then place a board on top, to conceal the studs one can simply have a painted 3 mm board at the bottom.

I wouldn't have felt secure with just a single board on top but then I'm a pessimist too

 

[sblixten]

I would probably want to have a beam in the wall as a support and then build a framework of beams resting on this beam and on the legs of the bed, then with a board on top. To hide the beams, you could just have a painted 3 mm board at the bottom.

I wouldn't feel safe with just a simple board on top, but then again, I'm a pessimist

I would prefer to avoid that. It steals space for the sleeping area.
I think there should be some kind of board that can be screwed on top that holds.
My first thought was plywood about 22mm, but I don't know where I got that from or if it's sufficient?
My knowledge of materials and their strength is much too poor.
Otherwise, I have previously used a material called sandwich (which I have built aquarium stands with and is similar to plywood). It should work if I can get hold of it. However, I don't know what it costs.
But it might end with an extra beam anyway

 

[nimhed]

I would have dared without extra joist if the plywood is 22mm. Provided that the long joists are then replaced with something stronger and you screw tightly. This without having calculated it.

 

[Snickerick]

Yes, I probably would have dared to use 22mm plyfa, of course without any joints. But ensured that the frames are strong enough and anchored to the wall.

 

[sblixten]

Sounds like it might work as I want it to after all.
How tightly do I need to screw the plywood?

 

[charta77]

What do the standing studs look like?

With five kids, everything can collapse in ways other than the plywood board breaking.

 

[sblixten]

What do the standing studs look like?

With five kids, the whole thing can collapse in ways other than the plywood breaking.

That's completely true, and it can be solved in different ways. I've considered mounting in the wall, thicker posts/pillars, or more of them (if needed). I believe I can calculate this, but haven't done it yet. It's primarily the floor that concerns me and where I feel my competence isn't enough.

In answer to your question, all the studs are 45x45 in the original design.

 

[nimhed]

30 cm between the screws should suffice

 

[AskeHolst]

I had not worried about the pillars' dimensions, but rather how they are connected. You could, in principle, place a car on that construction, as long as the load on each beam comes straight from above. It's when the parts start moving and the loads become skewed that it collapses. So, add a bunch of extra angle irons and fasten if possible to a wall.

 

[charta77]

I would not worry about the dimensions of the columns, but rather how it is assembled. You could basically place a car on that construction, as long as the load on each beam comes straight from above. It's when the parts start to move and the loads become skewed that it collapses. So attach a bunch of extra angle irons and fasten it to a wall if possible.

The children have to sit still?

 

[sblixten]

Found some tables for P30 (plywood):
http://www.traguiden.se/TGtemplates/popup1spalt.aspx?id=741
http://www.traguiden.se/TGtemplates/popup1spalt.aspx?id=758
The problem is that I can't manage to use them, but maybe there's someone here who can help me?