Final answer:
The minimum size for an ADA-compliant accessible shower is 30 by 60 inches with a clearance of 36 by 36 inches. At least two horizontal grab bars are required, installed at a height of 33 to 36 inches from the shower floor.
Step-by-step explanation:
The minimum size for an accessible shower, according to the Americans with Disabilities Act (ADA), is typically 30 inches by 60 inches to accommodate a wheelchair user. The ADA also requires the shower to have a clearance of 36 inches by 36 inches to provide enough space for a person in a wheelchair to enter and maneuver.
Regarding the installation of horizontal grab bars, it is generally recommended to include two or three, depending on the shower's size and design. The ADA specifies that at least one grab bar should be on the back wall of the shower and another on the side wall adjacent to the seat. This allows individuals with disabilities to maintain balance and stability while using the shower. The grab bars should be installed at a height of between 33 inches and 36 inches from the shower floor to the top of the grab bar, according to ADA standards, allowing for ease of reach for most users.
Specifically, grab bars should be horizontally mounted and should adhere to ADA guidelines which include ensuring that they can withstand a certain amount of force and are of a specific diameter for comfortable gripping. It's essential to consult current ADA guidelines or local codes as they can be subject to change and modifications may be necessary for compliance.