Final answer:
Grab bars shall be installed on the back wall and the side wall opposite the seat in a standard roll-in type shower compartment with a seat, but shall not be provided above the seat to ensure safety and accessibility.
Step-by-step explanation:
Regarding the installation of grab bars in a roll-in type shower compartment with a seat, the common building standards and guidelines state that grab bars should be installed on the back wall and on the side wall opposite the seat. It is important to note for safety and accessibility that grab bars shall not be provided above the seat.
Correct installation of these grab bars is crucial as they serve to aid in the stability and support for individuals using the shower, particularly those with mobility impairments.