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[Ustfoo]

Hokay. Been playing a little while. Somewhat intermediate. I am attempting my first GRANDE (read, nonefficient) fortress.

Through careful exploration I have discovered a small area that descends all the way to the magma sea without piercing a cavern. I am attempting to construct a pump stack that will manage this feat (148 pumps!). I have the earth dug out for the stack, but before I start installing pumps I would like to know if the walls surrounding the pump stack need to be magma safe. That is, do I need to dig 14 tiles out around my pumps and construct walls, or am I okay to just start pumping?

If you need a visual aid: Here is the basic layout Do my #s need to be constructed/magmasafe?


 ###
 #~#
X#^#
 +%#
 #~#
 ###


(edit I used the %> convention to represent pump direction. % being intake,)

[shibdib]

pretty sure jus the pumps need to b magma safe, dont believe the actual composition of the dirt/rock around it matter

[Passive Fist]

Walls are walls, and no matter what they're made of they're magma safe. Yes even wood.

[Quietust]

Walls are walls, and no matter what they're made of they're magma safe. Yes even wood.

And even ice, so long as it's a constructed ice wall (as opposed to a natural ice wall, which will definitely melt).

[Kanddak]

Not even the pumps need to be magma-safe, just non-wooden.