Interior wall of aerated concrete: plaster or drywall?

[MartinT]

I'm planning to build the house with aerated concrete, and I'm now considering how to handle the interior walls. I intend to do absolutely everything myself, and the end goal is to have them mostly painted, as I don't like wallpaper The question is how should it be done:

1) Plaster - disadvantages are that the plaster can crack (if not reinforced) and it's significantly harder to hang paintings, etc.

2) Put up drywall directly against the aerated concrete (possibly with OSB in between) - I don't see any disadvantages with this, and according to my preliminary calculation, it isn't more expensive (rather cheaper) compared to plastering, and it's much easier to hang paintings and similar.

What are the advantages of plastering? Exactly what type of plaster should I use? Are there any disadvantages to putting up drywall +/- OSB as I plan?

 

[Johannes88]

I wonder the same thing. So I'm trying to write and see if this thread gets going

 

[Petter Danielsson]

I wonder the same thing. So I'm trying to write and see if this thread gets going

I talked to a house seller a couple of days ago about just that. He suggested that the inside of the exterior wall should either be plastered or possibly have panels with an air gap between the OSB/gypsum and the aerated concrete due to moisture diffusion, but then you lose some of the benefits of the aerated concrete.

As for interior walls between rooms, you don't have that moisture diffusion, and it should be possible to glue gypsum to the aerated concrete and get a completely solid and rigid construction, but at the same time a smooth paintable surface quickly and cheaply. That's how I'm thinking anyway.

 

[Johannes88]

That makes sense!
Is it the same moisture diffusion one should consider if the masonry wall is above ground and insulation is on the outside?

 

[xLnT]

Why do you want to brick up the interior walls? Use studs, OSB, and plasterboard there instead.

 

[Petter Danielsson]

That sounds reasonable!
Is it the same moisture diffusion one should consider if the masonry wall is above ground and insulation is on the outside?

If you have foam plastic insulation on the outside of the lightweight concrete, it affects the wall's ability to breathe. Whether this argues for or against whether you could put gypsum directly on the inside, I'm not sure.. Maybe someone else knows?

 

[Petter Danielsson]

Why do you want to build the interior walls with brick? Use studs, OSB, and plasterboard instead.

It can be nice if you want the thermal inertia and sound insulation that aerated concrete provides compared to studded walls. It also makes building wet rooms easier. But I'm not personally convinced that it’s worth the additional cost compared to using studs and panel materials as you mentioned...

 

[Johannes88]

The exterior walls and the heart wall are made of aerated concrete/leca. They are all above ground and have insulation on the outside. It is also well-drained around the entire house, so I don't think there is any risk of moisture rising from the foundation into the walls.

I don't like the texture that comes with plastering and I think it's too much work to make plastered walls smooth enough to achieve the "drywall" feel. That's why I thought that gluing drywall could be an idea. Studs on the wall take up too much space, in my opinion.

 

[Anders D]

Plastered every day of the week. All walls plastered on the ground floor and plasterboard on the second floor. After 8 years, all the walls on the first floor look as fresh as day one. The second floor is starting to look a bit worn out.

So my recommendation is plaster. Easy to paint, the texture of the plaster gives life to the wall.