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[Raven]

http://www.bay12forums.com/smf/index.php?topic=77902.0

So I learned about this "exploit" thanks to the italian community and i'd like to know if there is some differences between a rough wall made of raw clay and a stone wall made of bricks of clay

iirc, a wall made of boulders is way easier to climb than a smooth wall (which should be impossible)

is the same with the clay collected by a kiln command?

do we need to make bricks to have smooth walls of clay?

[PatrikLundell]

There is no difference in walls made of different materials: once built they're equally impossible to destroy. Different materials have different colors, and, as indicated, smoothed walls are easier to climb than rough walls, and walls made out of boulders are easier to climb than walls made out of blocks. Logically the same argument might be applied to clay (I don't know if it's valid, though), although a brick wall isn't that hard to climb in real life (and real life clay walls tend to be fairly smooth).

I wouldn't think too much about it, though, as "harder to climb" probably isn't good enough anyway (smoothed natural rock is probably the exception here). Also, bricks are made in a 1:1 relation to clay "boulders", so you need to haul the clay at full weight to the kiln, and then haul the bricks to the building site, The odds are that you' clay deposit is roughly the same distance from the building sit as from the kiln, resulting in about the same clay boulder hauling for both cases, with an additional hauling of bricks if you make those (plus the effort of actually making the bricks).

[KevinM]

I've thought about the clay vs bricks behavior before too.  Never tested it, but like PatrikLundell said, it's just not worth it. 
If you have a magma kiln, you would have to get clay moved down there, then ship the bricks up.
If you use a regular kiln, you're using up a lot of coal / charcoal.

We're better off adding the layer or two of flooring off the walls to prevent climbers. (They do climb clay walls pretty easily)

If a brick wall is desired, it's more of a Stupid Dwarf Trick after we've moved magma up to have a surface kiln and don't have much else to do other than make brick sky structures that fall on armies like a ton of bricks.   I have considered replacing clay with brick at a later time in my fortresses but just never progressed to that point.

I'm also assuming you're looking at the surface, since it's easier to just section off caverns with clay, than consider climbers.

[Bumber]

iirc, a wall made of boulders is way easier to climb than a smooth wall (which should be impossible)

AFAIK, constructed walls can never be in the "impossible to climb" category, only difficult to climb. If you want impossible in a spot without natural stone, you've got to cast obsidian or ice, then designate a smoothing job. (The ice walls will melt if the temp gets above freezing.)

Floor overhangs are useful for preventing climbing upwards. For dropping creatures down a pit, you'll want smoothed natural walls.

[KevinM]

iirc, a wall made of boulders is way easier to climb than a smooth wall (which should be impossible)

AFAIK, constructed walls can never be in the "impossible to climb" category, only difficult to climb. If you want impossible in a spot without natural stone, you've got to cast obsidian or ice, then designate a smoothing job.

Floor overhangs are useful for preventing climbing upwards. For dropping creatures down a pit, you'll want smoothed natural walls.

Hmm, I'll have to see about doing this for my aboveground archer training rooms.  The overhang I usually put in mine causes some archers not to fire on the goblin at the bottom.