I have a shower what had a waterproof membrane applied over it (something like Redgard) and then tiled all around.
If I drill the drywall to install a handheld shower holder I will be effectivly "destroying" the waterproof. Is there another choice for affixing it to the wall?
I have the option to install the handheld shower holder in a lateral wall that is solid brick with tile on it. It won't touch the waterproofing, but the holder will be futher from the shower (about 50-60 cm) and in an unusual layout, that I would rather avoid if possible.