Does anyone know if OSB is fire-retardant or does it burn as well as dry wood? It would be a bit nice if it were treated with some form of fire retardant; there is the possibility to fireproof wood.
But it's so cheap that the risk is probably minimal that it has been done... but it's just as well to ask.
But it's so cheap that the risk is probably minimal that it has been done... but it's just as well to ask.
Wood generally hinders the progress of a fire because it does not burn very quickly. An interior wall consisting of 45x70 studs and a layer of 12mm wood fiberboard on each side is approved as EI30 (non-load bearing).
Some approved constructions from Isover: http://www.isover.se/byggkonstrukti...sade+konstruktioner/30+minuters+brandmotstånd
Some approved constructions from Isover: http://www.isover.se/byggkonstrukti...sade+konstruktioner/30+minuters+brandmotstånd
Yes, that's completely true as you say. However, if an entire room of OSB catches fire, it becomes quite a blaze even if it burns relatively slowly… I live in a small town with a slow fire department… and what we've built on is in another older wooden building.
When you mentioned that, it reminded me of something else I read because I sometimes manufacture fire doors, and when there's glass in them, we can't label them as fire doors, but I've read that hardwood burns at 0.6mm/min and softwood at 0.8mm/min. An OSB is quite soft, so just the board itself could stop for about 10 minutes.
Great link, thank you very much!
When you mentioned that, it reminded me of something else I read because I sometimes manufacture fire doors, and when there's glass in them, we can't label them as fire doors, but I've read that hardwood burns at 0.6mm/min and softwood at 0.8mm/min. An OSB is quite soft, so just the board itself could stop for about 10 minutes.
Great link, thank you very much!
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· Norrbotten
· 3 390 posts
Well, I would rather say that wood and wood boards contribute to the fire development. However, it is entirely correct that a well-constructed dense stud-wood board construction with at least 70 mm insulation can prevent fire spread for up to 30 minutes. EI-30 stands for E=Entegrety approximately smoke density and I=Isolation, insulation, meaning that the other side does not become so hot that fire can spread through conduction.cheetah1 said:
So to TS, OSB can hardly be considered as fire-retardant (the term is a bit unknown) but as you yourself write, wood chars slowly and thereby protects the underlying construction somewhat.
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