Why does everyone use OSB behind drywall?

[johnsilver]

I have changed my approach a bit regarding fastening in drywall, it's not really a problem. But honestly, I think a wall feels more solid and substantial if you have OSB or Plywood behind it. Preferably on a wooden stud and, of course, with insulation in the wall. But this is not an argument based on construction, rather a form of aesthetics. You don't win any competitions by building what holds the most. As long as it holds and follows the building codes, you don't need to overdo it for the sake of construction.

At the school I worked at, we installed plugs or double drywall so it was harder to break through with a hand and to mount cabinets and hangers on.

 

[useless]

What did you assemble? Why was it more difficult to put up cabinets and hangers?

 

[Mjölsered]

One reason you must have extra sheet material behind is that the wall will not be sufficiently torsionally stable otherwise to withstand possible loads. Additionally, if you have a harder board behind the gypsum, the wall can withstand an impact better, for example, an angry teenager punching the wall... yes I know, it's probably not a good example

Well, that wasn't really true. If you have an installation space (which you should have), you have stability. I have chipboard in all my walls, can hang anything without worrying.

 

[Mjölsered]

Classic firestarter for this forum: what type of board should be placed behind the drywall (if needed at all)? Always fun every time.

Tongue and groove boards
Plywood
Particleboard
OSB

I use OSB as floor protection and general protection during the construction period. Then I throw them at the dump. Hard to burn them in the fireplace with so much glue and wax in the material.
Behind the drywall, I have screw-glued 12mm particleboard from Byggelit. Just as strong as OSB and the walls become more stable as you glue them on, even on the short sides. You can straighten crooked studs with gluing. Particleboards are dimensionally stable and can therefore be glued.
The strength of the fastenings is basically as strong as OSB, but requires knowledgeable pre-drilling. Not as simple to get right and strong. Plywood and tongue and groove boards are superior in this context.
OSB is probably the most environmentally friendly since it is made from all the leftovers in timber production, such as roots, small branches, and others. Additionally, about 5% glue and surface wax.

3...2...1...here come the retorts

Hang up the board with paper nails and screw with double drywall screws. Fully approved according to AMA.

 

[Johan Gunverth]

Hang up the board with paper nails and screw with double plasterboard screw. Fully approved according to AMA.

But then it won't be as stiff and strong as with gluing, even if it suffices.

 

[Mjölsered]

But then it won't be as stiff and strong as with gluing, even if it suffices.

Yes, if there are joints on joists and one should do that.

 

[Johan Gunverth]

Yes, about joints on studs and you should do that.

You should do that also, of course.

 

[Raktorn]

If you read the forum, it seems like almost everyone here is putting up OSB boards behind the plasterboards in the walls and dissing catalog companies' walls. It naturally feels a bit more "solid" with OSB and I understand that it becomes easier to put up shelves. But when I think about my own current home (simple plasterboards everywhere - large construction company naturally built the house), I haven't really suffered from that as far as I can tell.

Are there any more construction-related reasons to add a layer of OSB? It feels like quite a lot of extra work and a big expense, which you want to minimize when building a house. At the same time, you absolutely don't want it to feel like some kind of shoddy construction.

. I agree with you, there are many studs and screws to anchor things in.

 

[johnsilver]

The best is to screw into the reglarna to avoid plugs or Molly.

 

[MathiasS]

. I agree with you, there are many studs and screws to anchor things to.

Yes, there are, but the golden rule that is ALWAYS true is that these studs and screws are NEVER where the wall-mounted item needs to be placed.

 

[Henke203]

Hello!

Are there really so few who use Plyfa behind?!? It seems OSB is the preferred choice, but I consider Plyfa to be much stronger. Sure, it's a bit more expensive, but it was about 80 SEK per sheet more than OSB, so I didn't hesitate. We redid our walls just because it was single plasterboard without insulation, and on the walls where we removed the plasterboard, we inserted Plyfa "inside" between the studs on the side whose plasterboard remained.

Raw wood paneling builds more, but there's less waste, so it's cheaper, but Plyfa also reinforces.

It's probably the price that dictates this, but also the usability?
I mean Plyfa absorbs moisture much more easily than OSB, and that might be another reason.
I don't know if it makes a significant difference, but an OSB is not as dense as a Plyfa.
The original question about using OSB behind plasterboard is definitely something I think should be done because even if the wall isn't load-bearing, it braces the entire house in a very good way.

 

[tomasjo]

[image]

Sorry to bump an old post, but I just have to ask if I'm the one who's being dense In the graphic, it says a 60 mm screw was used, but it looks like the screw only goes through the cabinet, the boards, and then sticks out a little bit behind. Shouldn't that be 12+11+ a couple of mm and not 60? Again, sorry for the old bump but I can't let go of this thought. Should we understand that the graphic is simplified so that the screw in the test wasn't fully inserted?

 

[Dan_Johansson]

Sorry to bump an old post but I just have to ask if it's me being dumb The graphic says they've used a 60 mm screw, but it looks like the screw just goes through the cabinet, the boards, and then sticks out a bit at the back. Shouldn't it be 12+11+ a couple of mm and not 60? Again, sorry for the old bump but I can't drop this thought. Should we understand that the graphic is simplified so that the screw in the test wasn't fully inserted?

I don't think you should trust that the person who made the graphic is the one who did the test... The length of the screw is probably chosen to go through all the boards...

 

[tomasjo]

I don't think you should trust that the one who made the graphics is the one who conducted the test.. The length of the screw is probably chosen so that it goes through all the boards...

Thanks for the response, then I'll let go of that thought

 

[Christer G.V.]

If you read the forum, it seems like almost everyone here puts up OSB boards behind the plasterboard in the walls and dismisses the catalog companies' walls. Naturally, it feels a bit more "solid" with OSB and I understand that it becomes easier to put up shelves. But when I think about my own current home (simple plasterboard everywhere - big construction company that built the house naturally), I haven't really suffered from it as far as I can recall.
Are there any more construction-related reasons to add a layer of OSB? It seems like quite a bit of extra work and a big expense, which you want to minimize when building a house. At the same time, you absolutely don't want it to feel like some kind of shoddy construction.

When you set up a large flat-screen TV, you'll notice the advantage!