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Unread 03-21-2018, 11:03 AM   #6
wwhitney
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Join Date: Dec 2015
Location: Berkeley, CA
Posts: 1,097
There are two plumbing codes in adoption in the US. Each one requires that the shower liner itself be sloped, i.e. that a preslope be installed under the liner:

2015 Uniform Plumbing Code:

408.7 Lining for Showers and Receptors. [ . . . ] Lining material shall be pitched 1/4 inch per foot (20.8 mm/m) to weep holes in the subdrain of a smooth and solidly formed subbase[ . . .]

2015 International Plumbing Code:

417.5.2 Shower lining. [ . . .] Liners shall be pitched one-fourth unit vertical in 12 units horizontal (2-percent slope) and shall be sloped toward the fixture drains [ . . .]

Cheers, Wayne
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