In 2004, BOMA and SIOR (The Society of Industrial and Office Realtors) released a collaborative document called the "Standard Methods For Measuring Floor Area in Industrial Buildings", commonly referred to as BOMA/SIOR 2004. Five years later, in 2009, the Standard received ANSI approval and the Standard was re-published and renamed to reflect it's new ANSI designation. BOMA/SIOR 2009 is otherwise identical to the 2004 predecessor. In 2012, BOMA published a new industrial standard, known as “Industrial Buildings: Standard Methods of Measurement (ANSI/BOMA Z65.2-2012)”. This revision aligns the industrial standard with the BOMA 2010 Office Standard.
The standard outlines two distinct methods of measuring industrial properties; the Exterior Wall Methodology (Method A) and the Drip Line Methodology (Method B). The BOMA 2012 industrial standard functions similarly to the BOMA 2010 office standard (ANSI/BOMA Z65.1-2010) with the principal difference being the Measure Line and other adaptations more relevant to industrial buildings, such as specific considerations with respect to mezzanines.
There are two distinct methods in the industrial standard, known as Method A and Method B but they are not the same as Method A (legacy method) and Method B (single load factor) in the office standard. From a calculation perspective, both Method A and Method B in the industrial standard are aligned with Method A of the office standard. The key difference between Method A and Method B in the industrial standard is the measure line.
Known as the Exterior Exterior Enclosure Method, Method A measures to the outside of exterior walls (measure line) to calculate areas. Method A is arguably more popular than Method B. Certain features of an industrial building are excluded from the calculation of area, including canopies, unenclosed connecting links, unenclosed exterior staircases or fire escapes and unenclosed shipping/receiving platforms. The main condition for an area to be excluded is that it exists beyond the measure line.
Known as the Drip Line Method, Method B measures to the most exterior drip line at the perimeter of the roof system to calculate areas. Method B is generally intended for wall-less industrial structures usually found in warmer climates.
While Method A is the most conventional approach for measuring industrial buildings, Method B has gained popularity (even in colder climates), where landlords wish to maximize the rentable area of their buildings. Certain features of an industrial building are excluded from the calculation of area, including canopies, unenclosed connecting links, unenclosed exterior staircases or fire escapes and unenclosed shipping/receiving platforms. The main condition for an area to be excluded is that it exists beyond the measure line.