International Building Code Section 803


International Building Code 803.1

General. Interior wall and ceiling finishes shall be classified
in accordance with ASTM E 84. Such interior finish
materials shall be grouped in the following classes in accordance
with their flame spread and smoke-developed indexes.
Class A: Flame spread 0-25; smoke-developed 0-450.
Class B: Flame spread 26-75; smoke-developed 0-450.
Class C: Flame spread 76-200; smoke-developed 0-450.
Exception: Materials, other than textiles, tested in accordance
with Section 803.2.

International Building Code 803.2

Interior wall or ceiling finishes other than textiles.
Interiorwall or ceiling finishes, other than textiles, shall be permitted
to be tested in accordance with NFPA 286. Finishes
tested in accordance with NFPA286 shall comply with Section
803.2.1.

Acceptance criteria. During the 40 kW exposure,
the interior finish shall comply with Item 1. During the 160
kW exposure, the interior finish shall comply with Item 2.
During the entire test, the interior finish shall comply with
Items 3 and 4.
1. During the 40kW exposure, flames shall not spread to
the ceiling.
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2. During the 160 kW exposure, the interior finish shall
comply with the following:
2.1. Flame shall not spread to the outer extremity
of the sample on any wall or ceiling.
2.2. Flashover, as defined in NFPA 286, shall not
occur.
3. The peak rate of heat release throughout the NFPA
286 test shall not exceed 800 kW.
4. The total smoke released throughout the NFPA 286
test shall not exceed 1,000 m2.

International Building Code 803.2.1

Acceptance criteria. During the 40 kW exposure,
the interior finish shall comply with Item 1. During the 160
kW exposure, the interior finish shall comply with Item 2.
During the entire test, the interior finish shall comply with
Items 3 and 4.
1. During the 40kW exposure, flames shall not spread to
the ceiling.
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2. During the 160 kW exposure, the interior finish shall
comply with the following:
2.1. Flame shall not spread to the outer extremity
of the sample on any wall or ceiling.
2.2. Flashover, as defined in NFPA 286, shall not
occur.
3. The peak rate of heat release throughout the NFPA
286 test shall not exceed 800 kW.
4. The total smoke released throughout the NFPA 286
test shall not exceed 1,000 m2.

International Building Code 803.3

Stability. Interior finish materials regulated by this chapter
shall be applied or otherwise fastened in such a manner that
such materials will not readily become detached where subjected
to room temperatures of 200F (93C) for not less than
30 minutes.

International Building Code 803.4

Application. Where these materials are applied on
walls, ceilings or structural elements required to have a
fire-resistance rating or to be of noncombustible construction,
they shall comply with the provisions of this section.

Direct attachment and furred construction.
Where walls and ceilings are required by any provision in
this code to be of fire-resistance-rated or noncombustible
construction, the interior finish material shall be applied
directly against such construction or to furring strips not
exceeding 1.75 inches (44 mm) applied directly against
such surfaces. The intervening spaces between such furring
strips shall be filled with inorganic or Class A material or
shall be fireblocked at a maximum of 8 feet (2438 mm) in
any direction in accordance with Section 717.

Set-out construction. Wherewalls and ceilings are
required to be of fire-resistance-rated or noncombustible
construction and walls are set out or ceilings are dropped
distances greater than specified in Section 803.4.1, Class A
finish materials shall be used except where interior finish
materials are protected on both sides by an automatic sprinkler
system or attached to noncombustible backing or furring
strips installed as specified in Section 803.4.1. The
hangers and assembly members of such dropped ceilings
that are below the main ceiling line shall be of
noncombustible materials, except that in Type III and V
construction, fire-retardant-treated wood shall be permitted.
The construction of each set-out wall shall be of
fire-resistance-rated construction as required elsewhere in
this code.

Heavy timber construction. Wall and ceiling finishes
of all classes as permitted in this chapter that are
installed directly against the wood decking or planking of
Type IV construction or to wood furring strips applied
directly to the wood decking or planking shall be
fireblocked as specified in Section 803.4.1.

Materials. An interior wall or ceiling finish that is
not more than 0.25 inch (6.4 mm) thick shall be applied
directly against a noncombustible backing.
Exceptions:
1. Class A materials.
2. Materials where the qualifying tests were made
with the material suspended or furred out from the
noncombustible backing.

International Building Code 803.4.1

Direct attachment and furred construction.
Where walls and ceilings are required by any provision in
this code to be of fire-resistance-rated or noncombustible
construction, the interior finish material shall be applied
directly against such construction or to furring strips not
exceeding 1.75 inches (44 mm) applied directly against
such surfaces. The intervening spaces between such furring
strips shall be filled with inorganic or Class A material or
shall be fireblocked at a maximum of 8 feet (2438 mm) in
any direction in accordance with Section 717.

International Building Code 803.4.2

Set-out construction. Wherewalls and ceilings are
required to be of fire-resistance-rated or noncombustible
construction and walls are set out or ceilings are dropped
distances greater than specified in Section 803.4.1, Class A
finish materials shall be used except where interior finish
materials are protected on both sides by an automatic sprinkler
system or attached to noncombustible backing or furring
strips installed as specified in Section 803.4.1. The
hangers and assembly members of such dropped ceilings
that are below the main ceiling line shall be of
noncombustible materials, except that in Type III and V
construction, fire-retardant-treated wood shall be permitted.
The construction of each set-out wall shall be of
fire-resistance-rated construction as required elsewhere in
this code.

International Building Code 803.4.3

Heavy timber construction. Wall and ceiling finishes
of all classes as permitted in this chapter that are
installed directly against the wood decking or planking of
Type IV construction or to wood furring strips applied
directly to the wood decking or planking shall be
fireblocked as specified in Section 803.4.1.

International Building Code 803.4.4

Materials. An interior wall or ceiling finish that is
not more than 0.25 inch (6.4 mm) thick shall be applied
directly against a noncombustible backing.
Exceptions:
1. Class A materials.
2. Materials where the qualifying tests were made
with the material suspended or furred out from the
noncombustible backing.

International Building Code 803.5

Interior finish requirements based on group. Interior
wall and ceiling finish shall have a flame spread index not
greater than that specified in Table 803.5 for the group and
location designated. Interior wall and ceiling finish materials,
other than textiles, tested in accordance with NFPA 286 and
meeting the acceptance criteria of Section 803.2.1, shall be permitted
to be used where a Class A classification in accordance
with ASTM E 84 is required.

International Building Code 803.6

Textiles. Where used as interior wall or ceiling finish
materials, textiles, including materials having woven or
nonwoven, napped, tufted, looped or similar surface and carpet
and similar textile materials, shall comply with the requirements
of Section 803.6.1, 803.6.2 or 803.6.3.

Surface burning characteristic test. Textile wall
and ceiling coverings shall have a Class A flame spread
index in accordance with ASTM E 84 and be protected by
automatic sprinklers installed in accordance with Section
903.3.1.1 or 903.3.1.2.

Room corner test, textiles. Textile wall coverings
shall meet the criteria of Section 803.6.2.1 when tested in
the manner intended for use in accordance with the Method
B protocol of NFPA 265 using the product-mounting system,
including adhesive.

Method B test protocol. During the 40 kW
exposure, the interior finish shall comply with Item 1.
During the 150 kW exposure, the interior finish shall
comply with Item 2. During the entire test, the interior
finish shall comply with Item 3.
1. During the 40 kW exposure, flames shall not
spread to the ceiling.
2. During the 150 kW exposure, the interior finish
shall comply with the following:
2.1. Flame shall not spread to the outer extremities
of the samples on the 8-foot by 12-foot
(203 mm by 305 mm) walls.
2.2. Flashover, as described inNFPA 265, shall
not occur.
3. The total smoke released throughout the NFPA
265 test shall not exceed 1000 m2.

Room corner test, ceiling and wall finish. Textile
wall and ceiling coverings shall meet the criteria of Section
803.2.1 when tested in the manner intended for use in accordance
with NFPA 286 using the product-mounting system,
including adhesive.

International Building Code 803.6.2

Room corner test, textiles. Textile wall coverings
shall meet the criteria of Section 803.6.2.1 when tested in
the manner intended for use in accordance with the Method
B protocol of NFPA 265 using the product-mounting system,
including adhesive.

Method B test protocol. During the 40 kW
exposure, the interior finish shall comply with Item 1.
During the 150 kW exposure, the interior finish shall
comply with Item 2. During the entire test, the interior
finish shall comply with Item 3.
1. During the 40 kW exposure, flames shall not
spread to the ceiling.
2. During the 150 kW exposure, the interior finish
shall comply with the following:
2.1. Flame shall not spread to the outer extremities
of the samples on the 8-foot by 12-foot
(203 mm by 305 mm) walls.
2.2. Flashover, as described inNFPA 265, shall
not occur.
3. The total smoke released throughout the NFPA
265 test shall not exceed 1000 m2.

International Building Code 803.6.2.1

Method B test protocol. During the 40 kW
exposure, the interior finish shall comply with Item 1.
During the 150 kW exposure, the interior finish shall
comply with Item 2. During the entire test, the interior
finish shall comply with Item 3.
1. During the 40 kW exposure, flames shall not
spread to the ceiling.
2. During the 150 kW exposure, the interior finish
shall comply with the following:
2.1. Flame shall not spread to the outer extremities
of the samples on the 8-foot by 12-foot
(203 mm by 305 mm) walls.
2.2. Flashover, as described inNFPA 265, shall
not occur.
3. The total smoke released throughout the NFPA
265 test shall not exceed 1000 m2.

International Building Code 803.6.3

Room corner test, ceiling and wall finish. Textile
wall and ceiling coverings shall meet the criteria of Section
803.2.1 when tested in the manner intended for use in accordance
with NFPA 286 using the product-mounting system,
including adhesive.

International Building Code 803.7

Expanded vinyl wall coverings. Expanded vinyl wall
coverings shall comply with the requirements for textile wall
and ceiling materials and their use shall comply with Section
803.6.
Exception: Expanded vinyl wall or ceiling coverings complying
with Section 803.2 shall not be required to comply
with Section 803.1 or 803.6.
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INTERIOR FINISHES

International Building Code 803.8

Insulation. Thermal and acoustical insulation shall
comply with Section 719.

International Building Code 803.9

Acoustical ceiling systems. The quality, design, fabrication
and erection of metal suspension systems for acoustical
tile and lay-in panel ceilings in buildings or structures shall
conform with generally accepted engineering practice, the provisions
of this chapter and other applicable requirements of this
code.

Materials and installation. Acoustical materials
complying with the interior finish requirements of Section
803 shall be installed in accordance with the manufacturer’s
recommendations and applicable provisions for applying
interior finish.

Suspended acoustical ceilings. Suspended
acoustical ceiling systems shall be installed in accordance
with the provisions of ASTM C 635 and ASTM C
636.

Fire-resistance-rated construction. Acoustical
ceiling systems that are part of fire-resistance-rated
construction shall be installed in the same manner used
in the assembly tested and shall comply with the provisions
of Chapter 7.

International Building Code 803.9.1

Materials and installation. Acoustical materials
complying with the interior finish requirements of Section
803 shall be installed in accordance with the manufacturer’s
recommendations and applicable provisions for applying
interior finish.

Suspended acoustical ceilings. Suspended
acoustical ceiling systems shall be installed in accordance
with the provisions of ASTM C 635 and ASTM C
636.

Fire-resistance-rated construction. Acoustical
ceiling systems that are part of fire-resistance-rated
construction shall be installed in the same manner used
in the assembly tested and shall comply with the provisions
of Chapter 7.