I'm going to apply cement board over marine proof sheet rock,anything special i stipulation to do save for screw it ...

Garage door problem?
Answers:    There is no such thing as rainproof sheetrock. The greenboard is water resistance at best. Make sure nearby is the
correct waterproofing behind the sheetrock if you don't want problems within the future. Make sure your screw cranium are sunk flush so they don't hit the back of your tile.
Since my wife and I get affianced, we've...
Along beside the screws I would use juice nails. One tube per respectively 4 x 8 sheet.