Thickness MDF

[yens]

I am going to insulate the sloped roof in my attic and will insulate down to the eaves. On the support beams, I planned to mount MDF to create heated storage in the knee walls. How thick does the MDF need to be, can I set MDF with CC60 or how closely do I need to place it? Is 10 mm enough, or should I use thicker MDF?

Thanks in advance

 

[nimhed]

Isn't it very expensive with MDF? Wouldn't it be better to use OSB and plasterboard? You could use renovation plasterboard (6mm) if you don't want it to be too thick.

 

[yens]

I will of course have OSB/gles+gypsum on the other walls and ceiling, but for the sections for the knee walls, I had planned to use MDF to be able to create nice integrated doors. It's not an enormous area, a quick estimate says 2.40*1.2 per "spot" and 3.5 spots. So, four large MDF boards.

The idea is to cut doors directly into these boards and thus create storage behind them.

See image.

 

[imported_Byggaren]

MDF is not a suitable material where you have a risk of moisture absorption because the boards swell. It is also the world's worst building material, even worse than particle board. More expensive as well.

I suggest that you skip the idea of MDF. It is more suitable for making furniture and similar items that should be kept indoors at room temperature. (And I wouldn't even use MDF for that myself.)
__________________
Byggaren

 

[bonnier]

Personally, I made attic spaces with OSB+gypsum, and in each "section" a door of MDF, attached with piano hinges and magnetic locks.

 

[yens]

ok, I had planned to make the entire part with MDF, since almost half of it was intended to be doors... However, I don't understand how it can be affected so much by moisture etc., since I will have the MDF in an indoor climate.

 

[bonnier]

Yeah, I had the same thought as you, to use MDF for everything. The doors might take up just over half the space, but I felt it was a bit of a waste to use MDF on all the walls.

 

[yens]

But how much more expensive is MDF really, 16 mm MDF costs about 250 SEK for 240x120, OSB costs 125 and Gypsum costs 75 SEK in the same size. I will make approximately 8x1.2 meters = about 10 square meters. If half are doors, the wall will be about 5 square meters for 200/2.88 = 70 SEK/square meter. 5 square meters MDF (doors) for 250/2.88=87 SEK/square meter. So I save about 17 x 5 = 85 SEK by choosing that option.

My question is thus whether it is (as suggested above) inappropriate with MDF, since the price difference is completely irrelevant... It should also be easier to get a nice finish with the same thickness.

 

[bonnier]

Now I'm just a (sometimes) happy amateur, but I don't think it should be inappropriate to use MDF for everything if it's a heated space (room temperature?). I've made a couple of closet doors in MDF that have warped a bit, but the doors on the kattvind are fitting perfectly. A couple of strong magnetic locks on the top and bottom ensure that the doors stay in place.

Addition: I used 10mm MDF for the doors.