Raised Floor In reference to Washington state codes, there's, and has been for a number of years, a requirement to have undercut doors. Code states doors should be undercut a minimum of 1/2" above end flooring floor if that's the methodology of room air flow used. Similarly to the http://rivergwmzr.designi1.com/19893360/rapid-systems-for-sub-floor-ventilation-professional-answers