Heat conduction is equivalent regardless of direction. Convection, on the other hand, is upward. The measurements are made so that convection does not affect the result. The temperature is likely according to a standard measurement method. I find it hard to believe that it has any significant impact. But if you are to compare data, they should be measured on the same basis.
One could probably summarize it by saying that cellulose has some advantages, but they are not particularly significant.
One could probably summarize it by saying that cellulose has some advantages, but they are not particularly significant.
Rock wool is probably a better choice than glass wool, as it is heavier and at least better for soundproofing. It also has better fire resistance properties.
Therefore, it neither prevents fire spread but rather promotes it, is my suspicion.
Mineral wool does somewhat slow the fire down.
I guess the foam plastic disappears in a "pooffff" in a few seconds when the flames are present and the temperature is over 500 degrees.
The example you give with welding sparks on foam plastic might be accurate. That is, the risk of ignition is probably not so high. However, I guess the fire risk is there once a structure is already burning and the temperature is several hundred degrees. Then I can imagine that foam plastic burns quite well, especially considering how much air there is in foam plastic.KnockOnWood said:
That can certainly happen.
But none of the houses have burned down yet, knock on wood.
And I see a bigger risk with all the plastic we have in furnishings, beds, sofas, curtains, etc.
Moreover, I talked to a neighbor about the flammability of foam plastic. His hobby is renovating junk cars, and he uses an electric welder and angle grinder daily. Besides, he has quite a bit of foam plastic lying around. So I asked if he wasn’t afraid the foam plastic would catch fire when the welding sparks and angle grinder sparks hit the plastic. But no, nothing happened other than the sparks melting a little crater, he said
So I wonder if the fire risk is a bit exaggerated.
Therefore, it neither prevents fire spread but rather promotes it, is my suspicion.
Mineral wool does somewhat slow the fire down.
I guess the foam plastic disappears in a "pooffff" in a few seconds when the flames are present and the temperature is over 500 degrees.
Okay. Yes, then maybe there are no major advantages in terms of thermal insulation.D Daniel 109 said:
However, advantages in terms of sound insulation and moisture buffering.
The price, on the other hand, is a huge disadvantage. Cellulose insulation is really expensive. As mentioned, 2-4 times as much as mineral wool. No wonder they are not gaining market share at a blazing speed
I would also like to add that I have also welded quite a bit near wood and sawdust and all sorts of junkThat can certainly happen.
But none of the houses have burned down yet, knock on wood.
And I see a greater risk with all the plastic we have in furniture, beds, sofas, curtains, etc.
By the way, I talked to a neighbor about the flammability of foam plastic.
His hobby is renovating scrap cars, and he uses electric welding and angle grinders daily.
In addition, he has quite a bit of foam plastic lying around.
So I asked if he wasn't afraid that the foam plastic would catch fire when welding sparks and angle grinder sparks landed on the plastic. But no, nothing happened other than the sparks melting a little hole, he said
So I wonder if the fire risk isn't a bit exaggerated.
...welding sparks on most materials that burn well, without anything much happening.So there's a big difference between ignition risk and fire risk.
Welding sparks on wood usually aren't too dangerous; it chars a couple of millimeters or so into the wood, and at worst, it smokes really badly/possibly a small flame, so you press it with the welding glove and then continue.
It's different, however, if you throw the same piece of wood in the stove, then it suddenly burns really well