International Building Code Section 719


International Building Code 719.1

General. Insulating materials, including facings such as
vapor retarders and vapor-permeable membranes, similar coverings,
and all layers of single and multilayer reflective foil
insulations, shall comply with the requirements of this section.
Where a flame spread index or a smoke-developed index is
specified in this section, such index shall be determined in
accordance with ASTM E 84. Any material that is subject to an
increase in flame spread index or smoke-developed index
beyond the limits herein established through the effects of age,
moisture, or other atmospheric conditions shall not be permitted.
Exceptions:
1. Fiberboard insulation shall comply with Chapter 23.
2. Foam plastic insulation shall comply with Chapter 26.
3. Duct and pipe insulation and duct and pipe coverings
and linings in plenums shall comply with the International
Mechanical Code.

International Building Code 719.2

Concealed installation. Insulating materials, where
concealed as installed in buildings of any type of construction,
shall have a flame spread index of not more than 25 and a
smoke-developed index of not more than 450.
Exception: Cellulose loose-fill insulation that is not spray
applied, complying with the requirements of Section 719.6,
shall only be required to meet the smoke-developed index of
not more than 450.

Facings. Where such materials are installed in concealed
spaces in buildings of Type III, IV or V construction,
the flame spread and smoke-developed limitations do not
apply to facings, coverings, and layers of reflective foil
insulation that are installed behind and in substantial contact
with the unexposed surface of the ceiling, wall or floor finish.

International Building Code 719.2.1

Facings. Where such materials are installed in concealed
spaces in buildings of Type III, IV or V construction,
the flame spread and smoke-developed limitations do not
apply to facings, coverings, and layers of reflective foil
insulation that are installed behind and in substantial contact
with the unexposed surface of the ceiling, wall or floor finish.

International Building Code 719.3

Exposed installation. Insulating materials, where
exposed as installed in buildings of any type of construction,
shall have a flame spread index of not more than 25 and a
smoke-developed index of not more than 450.
Exception: Cellulose loose-fill insulation that is not spray
applied complying with the requirements of Section 719.6
shall only be required to meet the smoke-developed index of
not more than 450.

Attic floors. Exposed insulation materials installed
on attic floors shall have a critical radiant flux of not less
than 0.12 watt per square centimeter when tested in accordance
with ASTM E 970.

International Building Code 719.3.1

Attic floors. Exposed insulation materials installed
on attic floors shall have a critical radiant flux of not less
than 0.12 watt per square centimeter when tested in accordance
with ASTM E 970.

International Building Code 719.4

Loose-fill insulation. Loose-fill insulation materials
that cannot be mounted in the ASTM E 84 apparatus without a
screen or artificial supports shall comply with the flame spread
and smoke-developed limits of Sections 719.2 and 719.3 when
tested in accordance with CAN/ULC S102.2.
Exception: Cellulose loose-fill insulation shall not be
required to comply with the flame spread index requirement
of CAN/ULC S102.2, provided such insulation complies
with the requirements of Section 719.6.

International Building Code 719.5

Roof insulation. The use of combustible roof insulation
not complying with Sections 719.2 and 719.3 shall be permitted
in any type of construction provided it is covered with
approved roof coverings directly applied thereto.

International Building Code 719.6

Cellulose loose-fill insulation. Cellulose loose-fill insulation
shall comply with CPSC 16 CFR, Part 1209 and CPSC
16 CFR, Part 1404. Each package of such insulating material
shall be clearly labeled in accordance with CPSC 16 CFR, Part
1209 and CPSC 16 CFR, Part 1404.

International Building Code 719.7

Insulation and covering on pipe and tubing. Insulation
and covering on pipe and tubing shall have a flame spread
index of not more than 25 and a smoke-developed index of not
more than 450.
Exception: Insulation and covering on pipe and tubing
installed in plenums shall comply with the International
Mechanical Code.