My room: The sign says "Warning!  Lava Below!  Dig down with Extreme Caution!"

Now occasionally, a random piece of my floor will catch fire for about 10-30 seconds:

I've seen two different pieces do it so far

I am aware of a lava pit immediately below this room, but I thought stone was supposed to be fire resistant!

This has already almost killed me. What's going on?

  • 1
    Is it because of the sign I wonder? – Raven Dreamer May 18 '11 at 2:38
  • @Raven: I wondered that too, but I caught on fire before I placed the sign. – John the Green May 18 '11 at 2:39
  • I've been burnt before by a lava pool that was diagonally adjacent to a block. Are you aware of a pool existing on the other side of that wall? – chandsie May 18 '11 at 2:47
  • 14
    I love the actual question titles on Gaming.SE. Every time I'm browsing through 'What's Hot' and I see something like 'Why is my floor on fire?', I do a double-take and WTF until I read the small text that indicates that the question is on Gaming.SE. – eckza May 18 '11 at 13:18
  • 1
    @kivetros: Well, I'd be surprised if it weren't. It's on fire, of course it's gonna be hot! – Piskvor May 19 '11 at 12:26

Apparently fireballs from lava can tunnel through up to two blocks sometimes causing a considered-to-be-safe location to catch fire.

I had to rebuild my wooden floor three times before I noticed my lava fall outside was to blame. (Since it's SMP with bukkit, WorldGuard solved this issue for me)

  • 4
    That explains why my nice brick and wood home once became a fireball during a neighbors visit...damn lava moat. – Rapida May 18 '11 at 6:14
  • @JiminP: yeah, I was already wondering when Notch would make minecraft more realistic :p – Zommuter May 18 '11 at 11:19
  • This explains how the fire got there, but I still want to know how stone can catch fire. – John the Green May 18 '11 at 16:52
  • 5
    @John: I think that's the mechanics of fire, the game first determines if something would catch fire and afterwards checks whether it actually is burnable. I don't know if it's a bug or intended behaviour since otherwise you could safely walk around a pool of lava without ever catching fire yourself... (since your character is not a block) – Zommuter May 19 '11 at 5:58
  • 1
    The answer is a common misconception, but fireballs are just fancy particles and have nothing to do with blocks catching on fire. Now and then, MineCraft randomly picks blocks within a certain distance from a lava block and sets them on fire if they fill certain conditions. The fireballs have nothing to do with this random selection. – IQAndreas Aug 14 '13 at 23:21

Combining the inputs of Raven Dreamer, chands, Tobias Kienzler, Kromey, Kevin Y, and Kevin Reid, I have decided that:

1: I caught on fire because I was unlucky enough to be diagonally southwest of a lava block.

2: The lava underneath my sign is tunneling up to it.

3: But because of a bug (possibly because a sign isn't a solid block), the blocks around my sign have been catching fire instead.

Many thanks to everyone.


I think this happens when you have a wooden but non-flammable block sufficiently close to lava to catch on fire; the fire-block is supposed to be burning the sign, but it doesn't — perhaps because the sign isn't a fully opaque solid block.

I've noticed this happening with fences, so it's likely the same thing here.


To test if my garbage can was producing the fire, I placed wood next to it. But suprize, suprize! A pice of wood on the floor above it caught on fire without the wood next to the garbage catching on fire. My garbage is a hitech pit in the ground with lava in it.

protected by Studoku Jun 13 '15 at 19:05

Thank you for your interest in this question. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).

Would you like to answer one of these unanswered questions instead?

Not the answer you're looking for? Browse other questions tagged or ask your own question.