328. RULES OF MEASUREMENT FOR FLOOR TO CEILING CLEAR HEIGHT

328 RULES OF MEASUREMENT FOR FLOOR TO CEILING CLEAR HEIGHT 328.1 The upper point of the measurement is the finished ceiling that is unobstructed by any of the following: (a) Elements of the building structure, other than columns and walls; (b) Components of mechanical, plumbing, or fire suppression systems; or (c) Components of electrical systems, except lighting fixtures. 328.2 If the ceiling is not finished, the distance shall be measured to the lowest point of any of the structural elements of systems referenced in Subtitle B §§ 328.1(a), (b), or (c). 328.2 For all stories above the ground level and for a ground story for which there is no clear height requirement, the bottom point of the measurement shall be the level of the finished floor. For a ground story subject to minimum clear height requirements, the bottom measuring point for clear height shall be the level of the curb opposite the middle of the building’s frontage on the street from which the building draws its clear height requirement. SOURCE: Final Rulemaking published at 63 DCR 10932 (August 26, 2016). District of Columbia Municipal Regulations Zoning Regulations of 2016: Definitions, Rules of Measurement, and Use Categories 11-B DCMR § 328