I need to attach a grab bar for a bathroom wall that is tiled from floor to ceiling. It is not inside a shower.
It is an exterior concrete block wall, then about 1/2" or less space (with insulation or furring strips) then the 5/8" drywall, then the ceramic tiles.
I would like to find the furring strip and use that, but using a stud finder over tiles are not reliable, and where I think I have them, it's not in the right place anyways, plus furring strip may not be strong enough anyways.
So I need to go to the concrete block. Can use Tapcon. However my previous experience with Tapcon is not good. I have a box that comes with the masonry bit. I will use it then drill, and when I am done I will screw in the screws and normally I will get to the end and it will still be spinning easily. I have a hard time getting a tight turn at the end.
When I used it last to hang drapery rod fittings I had a real hard time. Someone told me may be I ended up hitting "weak" spots of the concrete or the joints. But I found more weak spots than I found good spots. I am using the right tool (hammer drill) with right screws and bit. For the windows in the bed rooms if I messed up I can easily patch up the hole and repaint later. For a tiled wall if I make a mistake it is not so forgiving. Plus I wonder if the Tapcon screw having a section of empty space and drywall and tile, it will need a lot of depth inside the concrete to bite into it enough, or else I might mess up the tiles.
I was thinking toggle bolts between the tile and sheetrock, but for grab bar this will not be strong enough? Plus I don't think there is enough room between sheet rock and concrete block to fit a toggle without drilling into it anyways.
MC