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.
Best Answer
The holes drilled for the mounting bracket of the handheld are extremely small and the bracket would further deflect water entry.
But to be especially safe, you can force a silicone sealant into the drilled holes before mounting the bracket. The screw will push it into the gap, and this will effectively heal the break in the waterproofing membrane.
If you are especially paranoid about moisture, put a dab of silicone sealant on the back of the mounting bracket itself.