An accessible transfer shower supports moving from a wheelchair to a seat; a roll-in shower supports wheelchair entry and has a different opening and clearance arrangement. ADA provisions distinguish transfer, standard roll-in and alternate roll-in types. Confirm which bathing facilities and features are required, then coordinate the complete compartment, approach, seat, controls and threshold.
How do the three compartment types differ?
Section 608 distinguishes three layouts. A transfer-type compartment has 36-by-36-inch clear inside dimensions and a minimum 36-inch entry. It also needs the specified adjacent 36-by-48-inch clearance measured from the control wall. Its seat supports transfer into the shower.
A standard roll-in compartment has minimum clear inside dimensions of 30 by 60 inches, a minimum 60-inch opening and the specified adjacent clearance. An alternate roll-in compartment has a 36-inch width and minimum 60-inch depth, with a minimum 36-inch entry at one end of the long side. Controls, seating and grab bars follow the particular arrangement, so these types cannot be assembled from interchangeable dimensions.
Use the complete Access Board drawings and provisions when the designer specifies the layout. Nominal product dimensions may differ from the finished clear space after walls, tile and fittings are installed.
What else affects the installation?
Coordinate the seat, grab bars, controls, hand-held spray unit and reach before rough-in. Where the provisions require a seat, its position determines the usable control location. ADA shower spray units deliver water no hotter than 120°F; the water-heating and temperature-control design still needs the applicable plumbing-code review.
The general threshold maximum is one-half inch, with particular rules and a limited existing-facility exception for transfer showers. That exception is not automatic approval for any raised curb. Enclosures must not obstruct controls or transfer, and the approach space must remain usable after other equipment is installed.
What should the owner check before ordering?
Ask the designer to label the exact shower type and required finished clearances. Confirm the specified pan, seat and enclosure work together, and identify backing, drain location, waterproofing and temperature-control responsibilities. Keep the accepted details available to the installer and inspector.
The restroom accessibility overview covers adjacent fixtures, while the alteration-scope guide helps establish which existing elements are affected. Choosing an accessible product does not by itself resolve either question.