bit of help please when i have tiled a shower i have always tanked it out. but i have a job where they have had a shower over the bath first time for me would i still need to waterproof above the bath ???????
Belt and bracers - yes.
But most important is that the bath is fixed well to the wall and supported on all edges for movement - ie framed out. Then Silicon seal before you tile and tank at least the shower end and bath main wall up to ceiling. Then Silicon seal again from tiling to the bath and make sure the shower dial and outlet have no leaks or holes for the water to ingress.
Have fun.
It really depends on what sort of usage the shower will get, but same applies to a full shower really.. For peace of mind yes. But if the customer won't wear it, don't lose the job over it 😉