Here is a link to the 2010 ADA Standards for showers and bathtubs.
There is a lot of great detailed drawings and such to make planning a safe and functional shower or bathroom project.
2010 ADA Standards for Accessible Design
I believe the new guidelines and codes go into affect next year. March 15, 2012 if I'm not mistaken.
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Always get construction advice double checked by your local city hall. Flood Test Every Shower - Every Time.
Actually, they usually go into effect when the municality adopts the code.
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