Why does everyone use OSB behind drywall?

[fribygg]

When you are setting up a large flat-screen TV you will notice the advantage!

Today's thread lift?

 

[Argastesnickaren]

Today's thread lift?

No, I think the Härjedals kitchen thread from 06 where the last answer came in 09 was today's thread lift

 

[Jonas1130]

A large heavy flat TV cannot exist that a plasterboard cannot handle. A molly in plaster easily supports a TV and usually, four screws are used for a TV. However, a bookshelf like Elfa with rails can weigh quite a bit. Kitchen cabinets (but that's usually planned by setting short lines before covering the wall with sheet material).
When I was about to build my house, I was also entirely set on having OSB or chipboard behind the plaster "because it's good." My KA asked what exactly did you plan to hang that requires it. I couldn't think of any example. In my build, it became a mix of chipboard behind load-bearing walls and those meant to absorb forces. Walls that at most should support a picture have only plaster. I think it was a good compromise without feeling like I was being stingy.
Does anyone know which wall can support the largest load: one with 45 stud and OSB+plaster or one with 70 stud and plaster? (I don't know the answer).

It should just be the OSB option...

 

[&herr frej]

Should just be the OSB option...

Should just be the OSB option...

think in the long run you're building a house, putting up on walls what you need there. you sell the house, the new owner wants things in other places with single plasterboard/double plasterboard. it becomes a lot of new Molly holes to get things to hang up. not particularly fun to see old Molly holes at least 8mm or fifty-centimeter brackets on walls if you leave the Molly behind

 

[imported_Benno]

If you've seen the guy who tries to do a handstand and crashes through the drywall, you understand that single-layer drywall isn't enough.

 

[Eld]

If you have seen the old man attempting a handstand and crashing through the plasterboard wall, you understand that single plasterboard is not enough.

If you have ever playfully wrestled with your dad and he ended up putting his backside through the plasterboard between two studs, you'll also know that more than single plasterboard is needed.

 

[Nygamla hus]

One reason you must have extra paneling behind is that the wall won't be sufficiently torsionally stable otherwise to handle any loads. Also, 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

He He....Bought a house through foreclosure a few years ago. Large holes in the gypsum walls made me ask the guy who owned the house. -How did this happen? The answer was simple but enlightening. -Crazy angry wife, who didn't get what she pointed at. Hence the separation, and the house that was his she had destroyed just before she left. The bankruptcy didn't cover the debts. The poor guy was deported to a studio with leftover loans.
But feel free to learn from Sven-Ingvars when they sing -Beware of women, they want everything that exists.

 

[droopy]

I have plyfa everywhere there isn't old råspont. OSB isn't much for securing heavy things. With plyfa, you can use wood screws without any plugs in all situations.

I agree. I installed 15mm plyfa and double gypsum in the kitchen I built. I got hold of a surplus batch of plyfa cheaply, so the cost was better than 11mm OSB from byggmax. No problems whatsoever with the wall cabinets with those walls. The only downside was that my "hole in one" worked worse through 15mm plyfa.

 

[Jonas1130]

But why double gypsum?
By the way, 15 mm plywood is a really nice thing 🙂

 

[Nytt_användarnamn_2024_12]

Having a single layer of drywall on a wall costs about 100 SEK per 0.9m, adding OSB inside increases the cost by 219 SEK per 0.9m wall. Having 15mm construction plywood, which costs 459 SEK per 0.9m wall, and double drywall, the wall costs 100+100+459= 659 SEK per 0.9m, without considering labor time and screws.

Single drywall 100 SEK per 0.9m wall
Single drywall + OSB 319 SEK per 0.9m wall
Double drywall + 15mm plywood 659 SEK per 0.9m wall

It gets incredibly expensive with double drywall and 15mm plywood 😀 without considering the labor time which is outrageous if you contract it out...

Prices are sourced from Byggmax.

 

[droopy]

But why double plasterboard?
By the way, 15 mm plywood is a really nice thing 🙂

30 minutes of fire insulation with double plasterboard. Felt good in a kitchen. 3 layers of plasterboard are A60 and used in some flammable environments.

 

[Stefan1972]

But if it burns, it burns..... Double drywall is often used to separate fire cells. Doubtful if it has any stopping effect just for one room. A kitchen that becomes fully engulfed probably spreads quite quickly anyway since the temperatures rise so fast. Unless the kitchen is completely empty of flammable materials then......

 

[Daniel 109]

Double gypsum and single gypsum with OSB have basically the same fire protection.

 

[useless]

Above all in combination with fire-resistant insulation.

 

[pacman42]

But if it burns, it burns.....Double gypsum is usually used to separate fire cells. Doubtful if it has any stopping effect just for one room. A kitchen that becomes fully involved will probably spread quite quickly anyway because the temperatures rise so fast. Unless the kitchen is completely empty of combustible materials then......

The spread might go a little slower at least. It can save the house.