Can You Use 1 4 Inch Cement Board Walls

Cement board installation on side wall.

Can You Use 1 4 Inch Cement Board Walls. I am planning to put 1/2 drywall up (it's not up yet). Is one and five eights of an inch long enough or do i need something over 2 inches?

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Do i really need a shower pan or could i use concrete board for that also? Durock 1/4 is made for floors. You can use cement board over wood, then it gets painted or covered with a water tight membrane.

Not all walls are square with another wall or the ceiling.

Either can be used on floors but only 1/2 can be used on walls. Durock 1/2 inch cement board with edgeguard(tm), 4 ft. Cement board panels come in sizes that accommodate the bathtub recess. But, i read somewhere that the cement board and the drywall need to.