International Building Code 805.1
Application. Combustible materials installed on or
embedded in floors of buildings of Type I or II construction
shall comply with Sections 805.1.1 through 805.1.3.
Exception: Stages and platforms constructed in accordance
with Sections 410.3 and 410.4, respectively.
Subfloor construction. Floor sleepers, bucks and
nailing blocks shall not be constructed of combustible materials,
unless the space between the fire-resistance-rated
floor construction and the flooring is either solidly filled
with approved noncombustible materials or fireblocked in
accordance with Section 717, and provided that such open
spaces shall not extend under or through permanent partitions
or walls.
Wood finish flooring.Wood finish flooring is permitted
to be attached directly to the embedded or
fireblocked wood sleepers and shall be permitted where
cemented directly to the top surface of approved fire-resistance-
rated floor construction or directly to awood subfloor
attached to sleepers as provided for in Section 805.1.1.
Insulating boards. Combustible insulating boards
not more than 1/2 inch (12.7 mm) thick and covered with
approved finish flooring are permitted where attached
directly to a noncombustible floor assembly or to wood
subflooring attached to sleepers as provided for in Section
805.1.1.
International Building Code 805.1.1
Subfloor construction. Floor sleepers, bucks and
nailing blocks shall not be constructed of combustible materials,
unless the space between the fire-resistance-rated
floor construction and the flooring is either solidly filled
with approved noncombustible materials or fireblocked in
accordance with Section 717, and provided that such open
spaces shall not extend under or through permanent partitions
or walls.
International Building Code 805.1.2
Wood finish flooring.Wood finish flooring is permitted
to be attached directly to the embedded or
fireblocked wood sleepers and shall be permitted where
cemented directly to the top surface of approved fire-resistance-
rated floor construction or directly to awood subfloor
attached to sleepers as provided for in Section 805.1.1.
International Building Code 805.1.3
Insulating boards. Combustible insulating boards
not more than 1/2 inch (12.7 mm) thick and covered with
approved finish flooring are permitted where attached
directly to a noncombustible floor assembly or to wood
subflooring attached to sleepers as provided for in Section
805.1.1.