People are always asking what the term non-positive shut-off means. It's not well-documented but I believe that it refers to a handheld valve that makes the shower head continue to dribble water when the main valve on the wall is left on. This maintains positive water pressure on the head and hose so that water in the head and hose cannot backflow and siphon dirty tub water into the fresh water supply line if it is dropped into a tub with standing water. Remember that the hose has to be at least 59" long so it would fall onto the floor of the tub if dropped. It's a plumbing safety requirement.
Non-Positive Shut-off
General Comment or Question
Re: 2010 ADA Standards for Accessible Design Pocket Guide / 607.6 Shower Spray Unit and Water
James L. Terry | October 14, 2021 at 4:10PM (edited)
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- 2010 ADA Standards for Accessible Design Pocket Guide (2)
- 1991 ADA Standards for Accessible Design (1)
- 2012 Florida Accessibility Code for Building Construction Pocket Guide (2)
- 2012 Texas Accessibility Standards (TAS) Pocket Guide (2)
- 2016 California Standards for Accessible Design Pocket Guide - Eff. Jan. 1, 2017 (2)
- 2013 California Standards for Accessible Design Pocket Guide (1)
- Guidance on the 2010 ADA Standards for Accessible Design (1)
- 36 CFR Parts 1190 and 1191 ADA and ABA Accessibility Guidelines - Preamble (Discussion of Comments and Changes) (1)
- ABA Accessibility Standard for GSA Facilities Pocket Guide (1)
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