Ehm, don't you guys thing that if you make a tall \_/ shaped thing and patroll it at the top, it will flip?
In the form of, you get up from the thing falling sideways and look right into the rotten eyes of the zombie... '...hello?' omnomnomnom!
You'll be dead.
If its a wall around a building it should be big enough (not to mention anchored) to not flip...
True, but then it would not be movable, as was the topic.
I thought it changed from movable (its way to heavy) to building protecting?
Here's a template I came up with that could help, though it may be costly and time consuming to build, but it should discourage climbing over, while making it difficult anyway if anything intends to climb over:
v
__<_\|/_>__
/|*\ /*|\ Anti-climber porcupine spike strip + Hooks, barb-wire, and spikes
/\ /\
| | Spiked Wall
-| |-
_/ \_
/ \
| | | | Underground foundation
|_| |_|If zombies plan on getting past these, they'd have to be smart enough to focus an army on one small portion, and sacrifice enough bodies to make the porcupine system harmless. But by then, there would be enough firepower focused in the area to gun down the remaining zombies. This can only apply to armies of zombies. Individual, or wandering ones can't stand a chance against the wall.
Upon handling corpse issues (ones stuck on/in the wall), breed crows and vultures to take care of the bodies; especially if they build up an immunity to whatever caused the zombification. Just as long as the birds don't turn against man and start chowing on the living.
In case zombies are attacking from inside, you can always place C4 in the middle of the wall, and blow open a hole, and build a makeshift spike-barrier (out of the debris) upon leaving to hold them off for a moment, that is, if they find the hole you just made.If the top portion remains intact, you can rotate the wedge to face against the horde, especially if the remaining spikes and such are still attached.
So how's that for defensive measure? This looks like something the army would have built in advance way before a zombie invasion.
It can also be modified to be a single-sided defense, while the other side is a smoother, less deadly wall, with maybe even a ladder carved into it to be able to climb up and handle the zombies up close. Like so:
v
_\|/_>__
l .| /*|\ Anti-climber porcupine spike strip + Hooks, barb-wire, and spikes
a .| /\
d .| | Spiked Wall
d .| |-
e ./ \_
r ./ \
| | | | Underground foundation
|_| |_|Being a modular design, these things can be built however it is seen fit. If anything, they're mostly fit for med-long range defense for those using guns, whereas the spikes and barbs serve to handle close range.