Plywood or OSB for interior wall?

[Rickard.]

The difference in strength between OSB and K-plywood is significant. It can vary a bit between different quality classes but roughly speaking, plywood is twice as strong.

Here they are talking about the strength for holding things up on walls I think, so it's not quite the same thing. Attaching a forum favorite on the topic.

 

[Plupp 433451]

I strongly like the plywood..
Easy to install and holds up really well, beautiful patterns and rarely much filling needed..

Super

 

[FredrikR]

Here they're talking about the strength to keep things up on the walls, I think, so it's not quite the same thing. Attaching a forum favorite on the subject.

Exactly, that was the one I had in the back of my mind, although I haven't found it again in recent years.

 

[ARJU]

In summary.
It's mostly a matter of taste depending on how you intend to use it.

I have used OSB in the boiler room, I think it's nicer. If you're going to hang something really heavy, you should aim for the studs regardless of material choice.

 

[justusandersson]

The modulus of elasticity is approximately twice as high for plywood as for OSB, regardless of whether it concerns bending or tension. In the example in post #16, it is mostly the gypsum that is being tested. As I attempted to imply in my previous post, OSB is in most cases strong enough as a material behind gypsum. The finish on K-plywood is also not super high. In a residential space, I would choose pine or birch plywood.

 

[Rickard.]

In the example in post #16, it's mostly the plasterboard that is being tested.

What difference does the plasterboard make in how much it takes to pull out a screw? The plasterboard is also the same in all and therefore only shows the difference in the board materials behind.

The test is done by SP so it's probably relatively safe to rely on...

I want to add that you are probably right in what you say, but if one does not understand what it means, it's easy to believe that the plywood would be twice as good at holding up a heavy TV or shelf on the wall, and that is not true.

 

[Krille-72]

What difference does the gypsum make in terms of how much is required to pull out a screw? The gypsum is also the same in all and therefore only shows the difference in the sheet materials behind.

The test is done by SP so it's probably relatively safe to trust...

I want to add that you are certainly right in what you say, but if you don't understand what it means, it's easy to believe that plywood would be twice as good at holding up a heavy TV or shelf on the wall, and that is not true.

You always need to think about WHAT your purpose is. It's possible to hang quite heavy objects on a regular gypsum board with the right products.
Try to think a little like "Ikea tests in and out with loading on kitchen drawers". Used Ikea's kitchen drawers as an example because there was some video that popped into my head.

There is a reason why 15 mm "våtrumsplyfa" is approved for fastenings in bathrooms and not 15 mm OSB.

If you screw in 2 screws into chipboard, OSB, or Plyfa with the same thickness and hang up a hammer enough times, I swear, without scientific evidence, that the screws in the plywood will last the longest without starting to loosen.
Someone with too much time on their hands can test it.

 

[Rickard.]

There is a reason why 15 mm "wet room plywood" is approved for installations in bathrooms and not 15 mm OSB

It's probably just according to Säker Vatten? Säker Vatten recommends good solutions but that doesn't mean everything else is wrong or bad.

Then that plywood is better, I think most people understand, so you don't need to convince me, but in certain situations, the OSB is pretty close.

 

[MathiasS]

People see things differently. Over the years, I've learned to try to do things right the first time = yesterday a 50 inch, the day after tomorrow a 75 inch. The world is full of things that should work. Feel free to watch, Big Engineering Mistakes on TV, it's a wonderful program if you ask me

50" was ten years ago. Now it's 65-75" that are the norm, and the largest TV that can be bought at Elgiganten is 85" and weighs 54kg. As you can surely understand, there are no problems whatsoever securing such a TV (or the one you buy 10 years from now for that matter) on an OSB, chipboard, or plywood.

We don't see things differently, it was just that you believe plywood holds much better than OSB, which is factually incorrect. It's not a matter of opinion.

 

[Krille-72]

Is it just according to Säker vatten? Säker vatten recommends good solutions, but that doesn't mean everything else is wrong or bad.

Then that plyfa is better, I think most people understand, so you don't need to convince me there, but in certain situations, the OSB is pretty close.

Now I was trying to answer the original question from Ts along with many others. My choice fell on Plyfa.

Furthermore, I can mention that it is not just Säker vatten that recommends a good solution. When the "våtrumsplyfa" was developed as an alternative, all relevant industry organizations were involved, along with several insurance companies and a few others. The purpose of developing a common solution is obvious to me. But now we shouldn't discuss the "våtrumsväggen" in this thread.
Before this, OSB was definitely the most common substrate in bathrooms.

 

[Vermilion]

Wow, thanks for so many great answers! So I should see it as a matter of taste then I thought that OSB would be much weaker but I seem to be wrong about that, good thing I asked.