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[Spike GT]

I just learned something and looking around in the forums I don't see any mention of it, so here goes.  Constructed ice floors will melt when exposed to magma.  I just pumped magma up like 122 stories from the magma sea onto the tundra over my latest fortress.  There are a few little sections of floor that I had paved over with ice about 25 years prior, when I first dug out the first level (because they were just frozen ponds and the wall/floor thing with ice left them exposed), a fix to shield goblin eyes from the first layer of my fort.  Anyway, just uh, look out for that so you don't flood your arctic forts with magma and stuff.

[Flaede]

does magma melt ice walls below it?

[Spike GT]

Dunno, didn't test it.  I'm just putting some orthoclase walls in underneath the remaining floors so that my fortress doesn't get flooded when they melt.

EDIT: Aw, hell.  I'm gonna go ahead and stop the pumps, open the gates and construct some ice block walls just because I want to know.  More as it develops.

[Rastaan]

Time for science!

[o_O[WTFace]]

Yea supposedly ice is hardcoded to melt even as a construction, due to it being the primary ore of water and all.  Thats why its so buggy and strange in general. 

[Flaede]

do not visit a glacier fort in adventure mode. You bring the warm weather with you when you reach its map edge. Very strange.

[Spike GT]

Well, the totally-immersed rough ice block pillar is not melting, and neither is the one that is simply surrounded but not covered that I built further afield.  I also went ahead and built a rough ice block ramp, and it's holding too.  I guess it's just floors, then?  Didn't test with fortifications, though...wish I had for the sake of thoroughness, but I don't think it matters much either way.

[Flaede]

Well, the totally-immersed rough ice block pillar is not melting, and neither is the one that is simply surrounded but not covered that I built further afield.  I also went ahead and built a rough ice block ramp, and it's holding too.  I guess it's just floors, then?  Didn't test with fortifications, though...wish I had for the sake of thoroughness, but I don't think it matters much either way.

Thank you! Now I Know! You have furthered Dwarven Science!

[Ubiq]

I constructed some ice fortifications that melted when my river and lake thawed. At first, I thought that they were just submerged by the river, but they weren't listed as existing when I moved the cursor over their former location.

So that's:

Floors - melt
Fortifications - melt
Constructed walls - don't melt
Ramps - don't melt

At a guess, stairs will hold firm as well.

Natural ice walls are, of course, the farmers' best friend.

[Deimos56]

Oh.
That's interesting. It only melts the ones it can sit directly on in the same tile as the construction itself.

Except, oddly, for the stairs and ramps.

Didn't know magma had a preference for the stuff it melts...