Why does everyone use OSB behind drywall?

[Krille4]

Again, the claim that a regular, unclassified interior door would stop "lots" of smoke gas is wrong. If it stopped smoke gases, it would have been classified as I previously brought up in a text...

You don't seem to be very aware of how leaky a standard interior door is. Try using it as an exterior door, and you will feel the flow of cold air coming through the gaps between the frame and the door leaf and underneath where it is about 8-12 mm completely open...

So, fire smoke and gases will have penetrated the room within seconds in a developed fire...

If you have facts to the contrary, I would gladly receive them😊

Is this the blog post you linked to with no facts that you base your argument on?

https://24stockholm.se/brandklassade-innerdorrar-skillnaderna-jamfort-med-vanliga-innerdorrar/

You don't seem to understand the difference between a doorway and the same doorway with an interior door😉

But sure, I agree with you that when the house is fully engulfed, an interior door doesn't really matter much anymore.

/Krille

 

[Mikael_L]

99% of the readers in this thread probably understand that Daniel means "stops a fire surprisingly well" as in slowing down the fire's progression significantly. Not that a closed interior door will cause the fire to extinguish itself.

I think there is also a difference in opinion depending on the stage of the fire one envisions.

Whether it's in the initial stages, rapidly increasing towards fully developed, if it is already fully developed, or if it's at flashover.

In some situations, a closed paper door is somewhat useful, while in other situations, it barely matters even if it's a fire-rated door.

(edit: added the small word "even")

 

[Krille4]

Where do I mention door opening?
You're out of your depth, little you😇

I thought we were discussing the difference between an open and closed interior door.

/Krille

 

[Nytt_användarnamn_2024_12]

I believe there is also a difference depending on where in the fire development one imagines to be with their opinions.
Whether it is at the incipient stage of a fire, at a rapidly increasing fire towards fully developed, if it is already fully developed, or during flashover.

In some situations, a closed paper door can be of some use, in other situations, it hardly matters if it is a fire-rated door.

A fire-rated door is always tested against the standard so it holds in a developed fire if the wall and the installation follow the tested standard..e.g. EI30 withstands 30 minutes..

 

[Mikael_L]

A fire-rated door is always tested against the standard so it holds in a developed fire if the wall and installation follow the tested standard..e.g., EI30 withstands 30 minutes..

https://www.husbyggaren.se/sa-bestams-brandmotstandet/

 

[Nytt_användarnamn_2024_12]

[link]

What is it you want to say with it?

 

[Mikael_L]

What is it you want to say with it?

I just thought that this somewhat layman's explanation might be of general interest, considering what we're discussing.
Many on this forum enjoy learning something new, to find out a bit more.

 

[Demmpa]

You have entered a discussion between me and Daniel where I questioned his claim that a closed door stops lots of fire gases and nothing else...

It is the word "lots" that is an incorrect claim...

A regular closed interior door reduces lots of fire gases etc. compared to an open door.

 

[Krille4]

You have entered a discussion between me and Daniel where I questioned his claim that a closed door stops lots of smoke gases nothing else...

It is the word "lots" that is an incorrect statement...

Everything you're getting caught up with is totally irrelevant to that discussion🤓😇😉

I am also fully convinced that a closed interior door, by limiting oxygen supply, can stop "lots" of smoke gases. At least as long as the fire isn't fully developed and the room hasn't flashed over. It's quite rare for a fire to start with a fully developed fire and a flashover room.

But if the entire house has flashed over, as you argue, then a closed interior door probably doesn't matter for stopping the smoke gases.

According to the two firefighters in the discussion, it's apparently quite significant whether you close an interior door or not.

/Krille

 

[Nytt_användarnamn_2024_12]

A standard closed interior door significantly reduces fire gases etc. compared to an open door.

Define significantly? How long does one survive behind a closed non-rated interior door with a fully developed fire?
It's strange that no manufacturers, building function descriptions, or fire descriptions use that word.
Could it be because one only survives seconds, or does one survive because the non-tight, non-rated door stops a significant amount of smoke and gases?

Even a layperson understands the situation.

 

[Nytt_användarnamn_2024_12]

But if the whole house is fully involved as you argue from, then a closed interior door probably won't matter to stop the smoke.

Krille

Has nothing to do with being fully involved, a fully developed fire on the other side of the door is enough..

Once again, you twist words to fit his statement 😇

 

[Krille4]

It doesn't have to do with a fully involved fire, it's enough with a fully developed fire on the other side of the door...

Once again, you twist and turn words to fit his claim 😇

Can you show me the post where Daniel writes about a fully developed fire? Or is it you who added it to the discussion to fit your claim?

/Krille

 

[Nytt_användarnamn_2024_12]

Can you show me the post where Daniel writes about a fully developed fire? Or are you the one who added it to the discussion to fit your claim?

/Krille

I stop responding to you as you constantly twist and turn everything 😇

 

[Dr Benz]

Trolls 3 was released last week.. one of them was missing..

So you should NOT close an inner door because it will burn down anyway? I don't understand why there has to be a measure of how much it slows down?

If you save 5 seconds (surely LOTS more time in reality), then it's something that just goes on the plus side in such a situation. Who's going to measure what is needed to survive?

I use doors made of double drywall. Extremely satisfied with it.

 

[Daniel 109]

It has nothing to do with a fully developed fire, just a fully developed fire on the other side of the door..

Again, you twist and turn words to fit his claim 😇

If you have a fully developed fire in a room and an open door, it will spread to adjacent rooms very quickly. With a closed door, even a simpler one, you get a clear delay in the spread. If you have evidence to the contrary, feel free to present it.