Interior Finish. Interior finish is defined as the exposed material
of walls, ceilings, movable partitions, wainscoting, columns, other interior
surfaces of a building, and other interior materials applied to these
surfaces. Exposed insulating and acoustical materials are considered interior
Multi-family housing is defined as more than
two dwelling units under one roof. Town house style units separated by 2-hour
fire-rated walls are considered multiple single family dwellings, not multi-
Noncombustible Material. Noncombustible materials are those which
will not ignite, burn, support combustion, or release flammable vapors when
subject to heat or fire. Building materials that are reported as passing ASTM
E136, Behavior of Materials in a Vertical Tube Furnace at 750 Degrees C, shall
be considered noncombustible.
Smoke-Developed Rating. Smoke-developed rating is a numerical
classification determined by ASTM E84, which indexes the smoke generation rate
of a given material to those of two standard materials, asbestos-cement board
and select grade red oak.
Underground structures shall be as defined
by NFPA 101.
Windowless structures shall be as defined by