Myself being a master plumber and plumbing teacher retired when I install any and all grab bars. I locater the studs first on the area were I am going to install the grab bars usually 16" on center remove a small section of wall and tile being careful not to break the tiles. This section will be replaces with new sheet rock and saved tiles, install in between these studs a piece of !/2" plywood usually 17" by 18" make sure you nail the piece that is 17" long on the studs or use inside wood wood bracers to cut 17" pieces to fit the inside space of the stud after that is done fit the 18" piece into the space making sure that itis nailed on to the ply wood spacer after that is done replace the cut out walls. This area were you are installing the grab bars must be determined before you do anything and planned out. I have installed hundred of grab bars in this fashion. Good Luck
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