Is Ultra Board drywall enough

[johanasgarde]

Hi!

We are about to plaster the inside of our house that we are building. In the garage, we only used one layer of Ultraboard, which is Knauf's fiber gypsum with a claimed load capacity of 30kg per screw directly into the gypsum without a plug or stud behind.

My question is: is it safe to use only that inside the house? That is, without OSB behind. Of course, it saves a lot of time and money, given the prices of OSB today. At the same time, we're a bit hesitant about encasing the entire house with laminated wood panels that aren't so healthy. BUT, will that be enough for load-bearing, and is it manageable to spackle and paint on?

We think it works well in the garage. It has significantly better load-bearing capacity and is much more rigid and harder than regular gypsum, but at the same time, it's a porous material, and if you tighten the screw too much, it damages the gypsum and the screw starts to wiggle. OSB behaves differently.

Grateful for advice and experiences!
Best regards, Johan

 

[raveper]

You can have 2 layers of drywall instead of OSB

 

[johanasgarde]

Thank you! Do you mean that 2 layers of regular gypsum would create sufficient load-bearing capacity, or do you mean putting Ultraboard behind and regular gypsum after that?

 

[johanasgarde]

One can use 2 layers of gypsum instead of OSB

Thanks! Do you mean that 2 layers of regular gypsum would provide sufficient load-bearing capacity or do you mean to put Ultraboard behind and regular gypsum on top of that?

 

[raveper]

What are you planning to set up?

 

[Peter2400]

Hello!

We are getting close to plastering the inside of our house that we're building. In the garage, we only used one layer of Ultraboard, which is Knauf's fiberboard with an alleged 30kg bearing capacity on a screw going directly into the board without a plug or stud behind it.

My question is: can we go ahead and just use that and only that inside the house? That is, without OSB behind it. Of course, you save a lot of time and money with the prices OSB has today. At the same time, we're somewhat negative about enclosing the whole house with laminated wood panels that aren’t very healthy. BUT will it be sufficient in terms of bearing capacity, and is it manageable to spackle and paint on?

We think it works well in the garage. It has significantly better bearing and is much stiffer and harder than plasterboard, but it's still a porous material and if you drive the screw in too hard, it drills through the board and the screw starts to wobble. OSB behaves differently.

Grateful for advice and experiences!
Best regards, Johan

Yes, why not. I would just go with one layer of Ultraboard.
Seems much easier than dealing with multiple layers.

 

[raveper]

Single plaster walls feel cheap.

 

[Peter2400]

Single-layer drywall walls feel cheap.

How can you feel that
It's hardly visible to the naked eye.

 

[johanasgarde]

What are you planning to set up?

Don't know yet, but I don't like the feeling of underestimating. I think in general one wants to be able to set up a bit of anything over the years without being uncertain if it will hold. Shelves, cabinets, TV, etc.

 

[raveper]

Feels more solid and robust. Obviously not visible.
Can set up most things.

 

[Plupp 284245]

Place chipboard behind the drywall.

 

[johanasgarde]

Put chipboard behind the plasterboard.

Put chipboard behind the plasterboard.

do you prefer chipboard over OSB?

How can you tell
You can hardly see it with the naked eye.

No, you shouldn't!

 

[Plupp 284245]

I prefer plyfa, today it's probably the same price or even a bit cheaper than OSB. However, I think chipboard works very well, what you should keep in mind is to pre-drill when screwing. If you don't, the screw tends to tear the hole into crumbs. By drilling, a screw holds better in chipboard than in OSB (according to me at least).

 

[raveper]

You can use råspont behind instead of OSB. A bit more work but it's pretty fun to do anyway.