Thinking about which ceiling to choose... Right now there's just regular drywall on the ceiling, but we don't want to tackle plastering, so considering either MDF boards from ByggMax, or pre-painted white tongue-and-groove panel boards (kind of like beadboard, but without the bead...)
The price is tempting, so right now it's leaning towards the board (130 kr / m2)
The installation instructions say
If a hammer and nails are used during the installation of the panel, the length of the nails should be at least 35 mm.
When using a nail gun, the length of the staples should be at least 35 mm. Back width from 10.5 - 11.5 mm.
During installation, screws can also be used. We recommend construction screws of type BFK 35 4.2 x 35. Staples of type CS 500 or CS 14B/76 Duplex staples.
Installation on existing ceiling, image D: Long side: 1 nail/screw/staple every 150 mm. Short side: 1 nail/screw/staple every 150 mm.
Are you planning to mount the new ceiling on the drywall or tear it down first?
The drywall will stay. Initially, I considered plastering. But after reading how impossible it is to get a good result, and knowing how long it takes to just plaster walls, we've switched to something that's quicker to install...
is the idea to attach the new ceiling through the plasterboard to the framing underneath, in that case, probably only panel boards work to mount across the underlying framing. the mdf ceiling likely requires approx. 28cm c/c framing
This is what the plaster looks like in the ceiling. The long sides of the plaster are, of course, in the same direction as we want to install sheets/boards... So even if we use boards, which are easy to just nail up, I'm unsure what there is under the plaster to attach them to... It's carpenters who installed the plaster, which is why I'm not quite sure how the nailing battens are positioned.
Felt like I wasn't making any progress... Considering how the boards are screwed in, it looks like the battens are in the same direction as we want to install the ceiling panel (whether we choose boards or MDF panels). And that won't work...
So I unscrewed a drywall panel to see how the joists are placed.
Great! OSB under the drywall. So I can nail wherever I want Leaning towards pre-painted panel boards right now, which we can nail up with a nail gun. That way I won't have to worry about MDF panels falling down
Yes, that was the idea from the start. That's why there's plasterboard there But we can't find anyone who wants to do it for us, and I can't do it myself. I even thought about using raw wood on the walls to avoid plastering there, but the wife refused to paint all the boards, so now she has to plaster and wallpaper/paint the plasterboard instead. And then there will be wood on the ceiling instead.
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Leaning towards pre-painted panel boards right now, which we can nail up with a nail gun. That way I won't have to worry about MDF panels falling down 
