Why does everyone use OSB behind drywall?

[Nytt_användarnamn_2024_12]

But a closed inner door is still better than an open inner door?

/Krille

It's such a short time that it's negligible, the smoke gases and smoke will pour through with a difference of a few seconds..

 

[Nytt_användarnamn_2024_12]

Yes, it stops a lot of fire gases.

Can you show any evidence that an interior door found in small houses stops the fire gases?
Or are you just sitting there with a lot of opinions?

 

[Krille4]

It's such a short time that it's negligible, the smoke gases and smoke will billow through with a few seconds difference..

Strange that all the recommendations then are exactly to close the door to the room where it's burning. Is it just a myth that the fire department and all insurance companies spread?

/Krille

 

[Daniel 109]

Here is an example.

 

[Nytt_användarnamn_2024_12]

Strange that all recommendations are just to close the door to the room where it's burning. Is it just a myth that the fire department and all insurance companies spread?

/Krille

Yes, you buy yourself the time to get out of the residence but it doesn't stop a fire. Can you show me where in a fire description or construction description that a regular interior door is considered as fire protection?

 

[Mikael_L]

It is reasonably obvious that on the margin, it affects a little whether there is a simple masonite door instead of no door at all, or that there are small untightened holes rather than large untightened holes that have been missed during fireproofing.

However, the rate of heat release and smoke production from a developed fire is so large that I would argue that the closed masonite door or the fairly small untightened holes will not have any decisive impact on the course of the fire, perhaps 30-60 seconds.

A rule of thumb is that the fire doubles in size every 90-120 seconds.

 

[pacman42]

But it can have a significant impact on the spread of the smoke.

 

[Daniel 109]

It definitely has a greater impact than 30-90s.

 

[Nytt_användarnamn_2024_12]

Can those of you who claim that an interior door stops the fire gases show facts?
Otherwise, the speculations are quite meaningless..

 

[Mikael_L]

We have a firefighter here on the forum, right?
@PNO for example.

 

[Mikael_L]

Strange that all recommendations are indeed to close the door to the room where it is burning. Is it just a myth spread by the fire department and all insurance companies?

/Krille

The main reason for the advice to keep all doors and windows closed is to not give the fire access to more oxygen.

 

[Daniel 109]

Can those of you who claim that an inner door stops the fire gases show evidence?
Otherwise, the speculations are quite pointless..

Isn't the video above sufficient?

 

[MathiasS]

Can you show any evidence that an interior door in small houses stops the fire gases?
Or are you just sitting and expressing opinions.

No one has said that a door stops all fire gases.

However, you have said that a closed or open door only makes a difference of seconds in the progression - it is probably THAT claim that should be supported with evidence rather than anything else.

 

[Demmpa]

Yes, you buy yourself the time to get out of the dwelling, but it doesn't stop a fire. Can you show me where in a fire description or construction description a regular interior door is considered a fire protection?

No one writes that a regular interior door stops a fire, however, the spread of the fire is impeded for a while.

It's such a short time that it's negligible, the smoke gases and smoke will pour through with a few seconds' difference..

It's not just a few seconds that a regular interior door prevents the smoke gases.

 

[HenrikHuslöse]

A common interior door is made of solid wood. Wood doesn't burn through in seconds. There are pure masonite doors, but you shouldn't be so damn cheap.