Nope, almost all wrong.

Against shells deck and belt armor is all or nothing. You have enough on to bounce
certain shells fired at certain gun angles or you don't, in which case it does full
damage ( you don't ever reduce shell damage by 50% or 75% or what ever number
you think a certain thickness reduces damage by)

Only torpedo damage is reduced more when you keep on adding belt above 0.2".

Sorry it is not all or nothing. Armor works in different thicknesses. I suggest you test it out and see
how much armor cuts down the damage of shells. Add more test and see the reduction of damage
per shell. It is definately not all or nothing.

Same as belt armor for torp damage. .5ap and .1he defense reduces torp damage by around 50%.
When you get to .5he defense. It maxes out at almost 80% reduction in torp damage. (Tested by
Mods). So carrying Belt is way better than buldge b/c it doesnt get blown off. It is always their.

All in All armor does stack especially with SD.

--i have on my courbet deck 1.6 belt 1.8 bulge 2 bulgehead 25 :))--

i lol'd

0.4 belt to get 1 HE damage reduction (reduces torp damage by 50%) and rest bulge (as much
as it won't slow you down). This applies or rather SHOULD apply to all BBs except RN.

great post atemnot really helpful

Armor does not reduce damage effectively... it either stops shells completely or they do
almost full damage... so you either armor your ship fully or not at all... the only nation
that can effectively armor is UK other nations can stop 12" or maybe 14" shells with high
level ships, but the loss of speed is too bad to make it worth... as all other high level
ships use 14"+ guns anyway... so don't mind armoring MN ships... only good thing is 0.2
belt as it almost cuts torp damage by half and some bulge (as much as you like for loosing
speed... I only sacrifice 1 knot in the worst case... but only if it allows me to put a
decent amount of bulge on... MN BBs (at least BB1-3) rely on their agility, speed and
size, so keep em fast.

i have on my courbet deck 1.6, belt 1.8, bulge 2 bulkhead 25 :))...............

edit : now i have deck 2.1, belt 0.2, bulge 60, bulk 30 :D