NCC 2016 Volume Two
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SA 3 Wet Areas
Performance RequirementSA3.1 is satisfied for wet areas if they comply with SA 3.2.2.
Unless exempted by (b), the floor of a wet area, room or area containing a vessel must be graded to a floor waste.
A floor need not be graded to a floor waste as required by (a) if—
all vessels are provided with in-built overflow protection or have a permanent open trapped connection to the waste system (such as a WC pan); or
the floor drains without ponding to a floor waste within the shower area.
The fall of the floor surface to a floor waste must be—