Hello,

I'm in the process of fixing the stairwell from the living area down to the basement. The basement has plastered Leca walls, and the stairwell in the living area will have painted drywall with OSB underneath (to simplify mounting and make it more robust). The transition between the basement wall and the stair wall occurs at the underside of the floor joists.

However, it's quite a hassle working in the stairwell. High ceilings and impossible to place the ladder properly in the winding stairs. Therefore, I've put in a temporary floor at the level of the living area's floor. Joists across the floor beams that I luckily could access, then some boards and an OSB sheet in the other direction.

So now I can reach all the way up but unfortunately not all the way down to the transition to the basement wall. I can't mount the OSB and drywall all the way down as long as my temporary floor is in the way! The OSB isn't really a problem since the panels are only 240 cm long and the seams will be hidden by the drywall. However, you'd like to install the drywall all the way down (about 270 cm) without seamed short sides.

Therefore, I'm considering installing the drywall horizontally and spackling as I go. When I then get down to the temporary floor, I can remove it and work from the stairs directly. Then it's just a matter of painting with a roller on a long pole, and everything is done.

Is it a no-no to install drywall horizontally? Does anyone have another tip on how I should solve the problem?

-h
 
It's possible to mount the plasterboard crosswise. It might be a bit more cumbersome to apply joint compound, but it's not the end of the world. There was a good American instructional film on how to apply joint compound to plasterboard, but it's no longer available to watch for free. In it, you get the impression that they always place plasterboard horizontally in the States.
 
I think there are some problems with mounting the plasterboard horizontally (which sometimes has to be done) because there's no chamfering on the boards at these ends, or paper that surrounds the plaster, it usually leads to issues when mounting edge to edge on a 45 stud. The drywall screw attaches poorly and tears the plasterboard. Furthermore, it may show in the finished work, that joint tape and plaster, builds up a bit extra here.
 
Edge mounting is not a problem for me since I have a layer of OSB underneath. I will gladly place the joints between the studs. Thank you for the advice.

-h
 
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