Instructions for Preparing Gross Area Tabulation.
This is the square meter (foot) quantity number used on the
project DD Form 1391. The gross area documentation consists of
calculation and tabulation of the building gross floor area
illustrated with small scale, single-line dimensioned drawings as
demonstrated in the attached figure. The following procedures will be
used to calculate the gross building area.
a. The gross area includes the total area of all floors with a
floor-to-ceiling height of 2134 mm (7 ft) or greater, including
basements, mezzanines, penthouses, mechanical and electrical spaces,
enclosed loading docks, and ambulance garages. Gross area is measured
from the exterior surfaces of all enclosing walls except where the
exterior wall surface overhangs the exterior window surface by one
foot or more. In this case, the gross area is measured from a point
one-half the distance between the exterior plane of the window glazing
and the outermost plane of the wall.
b. The following spaces are counted as one-half of the actual
Exterior balconies and porches.
Covered but not enclosed walks, passageways, ramps,
Exterior open stairs (covered or uncovered).
c. The following shaft type elements are counted in the gross
area of one floor only: atria, unenclosed floor openings, stairs,
escalators, elevators and lifts, mechanical and electrical shafts, and
other shafts connecting two or more floors.
d. The following areas are not counted in the gross area: spaces
with less than seven feet floor-to-ceiling height; exterior insulation
applied to an existing building; exterior, uncovered, unenclosed
terraces, ramps, stoops, and pads; open courtyards; utility tunnels;
equipment yards; and crawl spaces. Crawl spaces with a clear height
of seven feet or greater are not counted in the gross area provided
the clear height of seven feet and greater is the result of the
natural site terrain or foundation construction.
e. The gross area for site and supporting facilities, such as the
central utility plant, pump house, and utility buildings, which are
not included in the Program For Design is tabulated separately from
the main building gross area tabulation. The gross area of all site
and supporting facilities which are identified in the Program for
Design is accounted for in the main building gross area tabulation.
f. A separate tabulation is required for the mechanical area.
This tabulation will include the net area of all mechanical,
electrical, and telecommunication rooms and utility shafts. Walls,
partitions and structural elements associated with these spaces are
included in the general gross area not the mechanical area. Vertical
circulation spaces, such as elevators, escalators, lifts, stairs, and
trash chutes, are counted in the general gross area not the mechanical