UL PRODUCT CATEGORY

[Exterior Wall Systems and Components] Exterior Wall Systems, FWFO


See General Information for Exterior Wall Systems and Components

GENERAL

This category covers exterior non-load-bearing wall assemblies investigated to ANSI/NFPA 285, "Standard Fire Test Method for Evaluation of Fire Propagation Characteristics of Exterior Non-Load-Bearing Wall Assemblies Containing Combustible Components," as required by the "International Building Code," or ANSI/NFPA 5000, "Building Construction and Safety Code."

ANSI/NFPA 285 is used to investigate the fire-propagation characteristics of exterior non-load-bearing wall assemblies and panels used as components of curtain wall assemblies that are constructed using combustible materials or that incorporate combustible components within the wall assemblies as follows:

1. The ability of the wall assembly to resist flame propagation over the exterior face of the wall assembly,
2. The ability of the wall assembly to resist vertical flame propagation within the combustible core or within other combustible components from one story to the next,
3. The ability of the wall assembly to resist vertical flame propagation over the interior surface of the wall assembly from one story to the next, and
4. The ability of the wall assembly to resist lateral flame propagation from the compartment of fire origin to adjacent compartments or spaces.

The systems covered under this category apply to assemblies in their entirety. The illustrated designs reflect the precise dimensions and condition of the sample assembly which has been subjected to the fire-response test. A construction must duplicate the illustrated design and the details included in the associated text in order to achieve the anticipated performance, as tested. Individual components are not intended to be interchanged between assemblies, but rather are designated for use in a specific design in order that the performance of the system may be achieved. Consequently, the substitution or elimination of components required in a system should not be made unless specifically permitted in the individual system or in these general guidelines.

Numbered items refer to the descriptive text below each drawing. Individual components of a proprietary nature, or over which it is necessary to exercise control at the manufacturing location, are certified under the Certification and Follow-Up Service of UL. Those materials identified by an "*" in the system description text are eligible to be produced under the Follow-Up Service Program of UL. Information identifying such materials and the certified companies authorized to provide the materials are covered under Exterior Wall System Components (FWFX). Each certified product bears the label or other identification of UL from which it may be determined that a product is suitable for use as a material in a particular assembly or assemblies.

Authorities Having Jurisdiction should be consulted before installation as to the particular requirements covering the installation and use of these systems.

RELATED PRODUCTS

Components intended for use with the exterior wall systems are covered under Exterior Wall System Components (FWFX).

Where exterior walls are required to have a fire-resistive rating, see Fire-resistance Ratings - ANSI/UL 263 (BXUV). These assemblies and designs are investigated to ANSI/UL 263.

ADDITIONAL INFORMATION

For additional information, see Building Materials (AABM).

REQUIREMENTS

The basic standard used to investigate products in this category is ANSI/NFPA 285 (2012), "Standard Fire Test Method for Evaluation of Fire Propagation Characteristics of Exterior Non-Load-Bearing Wall Assemblies Containing Combustible Components."

Where indicated in the individual assemblies:

Exterior wall systems have also been investigated to ASTM E331 (2000), "Standard Test Method for Water Penetration of Exterior Windows, Skylights, Doors, and Curtain Walls by Uniform Static Air Pressure Difference," and/or ASTM E2357 (2011), "Standard Test Method for Determining Air Leakage of Air Barrier Assemblies." For systems investigated to ASTM E2357, the system is subjected to wind-load conditioning that is modeled for wind-pressure designs having Q10<0.20 kPa or Q10>0.20 kPa as determined by the test sponsor. For conditions that have been tested to the more severe condition, these have been identified as Category 1 in the ASTM E2357 header, and Category 2 for those systems tested to the less severe condition.

Exterior wall systems have also been investigated to ASTM E96 (2010), "Standard Test Methods for Water Vapor Transmission of Materials" (Procedure A, "Desiccant Method," and/or Procedure B, "Water Method"), and/or ASTM E2178 (2011), "Standard Test Method for Air Permeance of Building Materials." Categories of permeance are shown in the systems as follows:

0.1 PERM OR LESS, or
0.1 < PERM 1.0 PERM, or
1.0 < PERM 10 PERM, or
10.0 < PERM 20 PERM, or
GREATER THAN 20 PERM

ICC-ES Acceptance Criteria 212, "Acceptance Criteria for Water-Resistive Coatings Used as Water-Resistive Barriers Over Exterior Sheathing," specifies that air-barrier assemblies investigated to ASTM E2178 achieve a minimum condition of acceptance for air permeance that is less than or equal to 0.004 cfm/ft2 (0.02 L/s-m2) at 75 Pa for each specimen.

UL MARK

Those materials identified by an "*" in the system description text are eligible to be produced under the Follow-Up Service Program of UL. The Certification Mark of UL on the product is the only method provided by UL to identify products manufactured under its Certification and Follow-Up Service.

Alternate UL Mark

Those materials identified by an "*" in the system description text are eligible to be produced under the Follow-Up Service Program of UL. The Classification Mark of UL on the product is the only method provided by UL to identify products manufactured under its Classification and Follow-Up Service.

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UL, in performing its functions in accordance with its objectives, does not assume or undertake to discharge any responsibility of the manufacturer or any other party. UL shall not incur any obligation or liability for any loss, expense or damages, including incidental or consequential damages, arising out of or in connection with the use, interpretation of, or reliance upon this Guide Information.

Wall Systems, Exterior
Last Updated on 2014-07-31
FWFO.GuideInfo FWFO Active 20140731 20140731

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