Originally Posted by
Markus Keller
'Level' may not be a correct standard anymore for some units.
The unit manuals and class literature both stated that the units should be slightly out of level to help drainage at the bottom of the unit.
Years ago, some of the installation instructions wanted the same thing, for the same reason, and stated 'up to 1/4" per foot slope'. If that is in the manufacturer's installation instructions, that would trump the code's "level" (or maybe I should say 'clarify' what the code's "level" tolerance is).
A common tolerance for 'level', as in for accessible surfaces, is " 2% ", which equates (is equated to) " 1/4" per foot " (duly noting here that 2% is not-quite 1/4" per foot, but that 1/4" per foot has become the accepted 2% maximum slope / cross slope).
To me, "shall be level" means "shall be level", and that the manufacturer may well state "to a maximum slope of 1/4" per foot", then again, the manufacturer may not state that, they may state 'on a level pad', which, again, means "level" ... or there abouts.
