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? May 18, 2011 at 2:38
  • @Raven: I wondered that too, but I caught on fire before I placed the sign. May 18, 2011 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, 2011 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, 2011 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! May 19, 2011 at 12:26

4 Answers 4


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, 2011 at 6:14
  • @JiminP: yeah, I was already wondering when Notch would make minecraft more realistic :p
    – Zommuter
    May 18, 2011 at 11:19
  • This explains how the fire got there, but I still want to know how stone can catch fire. May 18, 2011 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, 2011 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, 2013 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.

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .