Public Comments Sought on Changes to NFPA 285 Testing Standard

Originally published by the following source: NFPADecember 4, 2017

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The next (2019) version of NFPA 285, Standard Fire Test Method for Evaluation of Fire Propagation Characteristics of Exterior Non-Load-Bearing Wall Assemblies Containing Combustible Components, is currently in a second draft, and public comments are being accepted until December 8, 2017. This draft contains a change to the test setup requirements that would require all NFPA 285 testing to include a vertical joint in the assembly above the window opening. If this passes as proposed, all existing NFPA 285 tests would be invalidated if the original tests do not include this joint (which is unlikely). Click here if you would like to submit comments on this second draft.

In addition, a proposed tentative interim amendment (TIAs) has being published for public review and comment regarding the current (2012) version of NFPA 285. Anyone may submit a comment on this proposed TIA on or before December 21, 2017.

TIAs are amendments to an NFPA standard that are processed in accordance with Section 5 of the Regulations Governing the Development of NFPA Standards. If issued, TIAs become effective between editions of a standard. A TIA automatically becomes a Public Input for the next edition of the standard, then proceeds through the NFPA standards development process.

Below are the details of the amendment to the 2012 NFPA 285:

NFPA 285 - 2012 Edition

Standard Fire Test Method for Evaluation of Fire Propagation Characteristics of Exterior Non-Load-Bearing Wall Assemblies Containing Combustible Components

TIA Log No.: 1264R

Reference: 1.1.1, 1.2, and A.1.1.1

Comment Closing Date: December 21, 2017

Submitter: Marcelo Hirschler, GBH International, and Michael Schmeida, GYPSUM Association  

1. Revise paragraph 1.1.1 to read as follows:

1.1.1* This standard provides a test method for determining 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, and that are intended to be installed on buildings required to have exterior walls of noncom­bustible construction.

2. Revise section 1.2 to read as follows:

1.2 Purpose. The purpose of this standard is to provide a stan­dardized fire test procedure for evaluating the suitability 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 for installation on buildings where the exterior walls are required to be noncombustible.

3. Revise annex material A.1.1.1 to read as follows:

A.1.1.1 The fire test method described is intended to evaluate the inclusion of combustible components within wall assem­blies/panels of buildings that are required to have exterior walls of noncombustible construction.

The test apparatus described in this standard is commonly re­ferred to as the intermediate-scale multistory test apparatus (ISMA).

Substantiation: In both NFPA 5000 and the IBC, NFPA 285 is being used to assess vertical and lateral flame propagation for exte­rior walls containing combustible components. The NFPA 285 test standard was originally developed for the evaluation of combus­tible materials installed on non-combustible buildings (Types I and II construction). The NFPA 285 test standard is now being used to assess the fire performance of combustible materials which can be installed in all types of buildings, irrespective of the Type of con­struction, including buildings constructed using combustible com­ponents (FRTW Wood framing). As the building codes are being actively revised to reflect current construction practices, such as podium construction, the use of FRTW wood in Type III Buildings, and the use of heavy timber/tall wooden building construction, a conflict between the scope of the standard and the common practice now exists. This conflict is preventing the use of the NFPA 285 test standard for the evaluation of combustible materials in these new construction arenas.

For example, NFPA 5000-2015 includes testing to NFPA 285 for exterior non-bearing walls of any type in, for exterior non-bearing walls of Type III construction without limitation in, for exterior non-bearing walls of Type IV construction without limitation in, for exterior walls of Types I, II, III and IV construction containing MCM materials in 37.4.4, for exte­rior walls of Type I, Type II, Type III, and Type IV buildings of any height containing foam plastics in Similarly, the Inter­national Building Code (IBC-2015) also contains multiple require­ments for use of NFPA 285 without any requirement that the wall (or the building) be of combustible construction. In NFPA 5000, a second revision also added NFPA 285 testing to section 37.1.5 for exterior non-bearing walls. The fire test standard itself should not differentiate between the type of wall construction materials. This precedent has been taken in many other fire performance test standards, including NFPA 252, NFPA 257, NFPA 268, NFPA 286, ASTM E119, and ASTM E814.

At the first revision stage, during the development of what was expected to be the 2018 edition of NFPA 285, the NFPA Fire Tests committee decided to make a change in the scope to clarify that NFPA 285 is applicable to any type of construction. That first revi­sion received no public comments. However, during the second revision meeting it was argued that, if exceptions to the noncom­bustible requirement need to be made, they should be made within the building codes and not within the test method. The technical committee accepted that argument and reinstated the original scope.

Unfortunately, after the second revision was issued it was brought to the attention of the technical committee that the wording in the scope was being used (without adequate technical justification) by an ICC Ad-Hoc committee for the IBC (ICC Ad Hoc Committee for Tall Wood Buildings) for excluding NFPA 285 from use for new tall buildings composed of combustible exterior construction. The IBC committee was created by the ICC Board of directors to explore the building science of tall wood buildings with the scope being to investigate the feasibility of and take action on developing code changes for tall wood buildings. This is a multi-year effort with the objective of the submission of code changes for the 2018 Group A Cycle (IBC) in January/2018. So, in fact, the Fire Tests Committee was incorrect in their conclusion during the second revision meet­ing. This error needs to be corrected.

NFPA 285 is a multi-story test of an exterior wall construction that contains a window and is unique in being able to assess the upwards flame spread, the potential for window penetration from exterior fires and the flame spread (vertical and horizontal) within the combustibles contained in the assembly. No other fire test that is in use today contains that unique feature. However, if the scope is not changed the ICC committee will encounter serious difficul­ties for proposing the use of NFPA 285 to assess upwards flame spread and flame penetration for buildings of combustible construc­tion and other, less appropriate, tests will be used. In fact, it is an almost certainty that NFPA 285 would not be able to be used for the next edition of the IBC, with proposals due January 2018, since the next NFPA edition, following the traditional development pro­cess, would not issue until too late in the development process of the code. This time line became even more critical with the return of the proposed 2018 edition of NFPA 285 to committee by stan­dards council.

Similarly, the same arguments would prevent NFPA 285 from being able to be used in similar applications in the next edition of NFPA 5000.

As an example of the need to avoid placing restrictions on the use of the appropriate fire tests, I want to quote from Jim Pau­ley’s recent alert to the fire safety community following the Gren­fell fire, in the United Kingdom (and other high-profile fires). He stated (among other comments) the following: “These tragic fires entirety, they are a collective example of how, either intentionally or accidentally, the fire prevention and protection system has been broken. A system that the public believes exists and counts on for their safety - through complacency, bad policy and placing econom­ics of construction over safety - has let them down.” He addressed the vital roles that government; policy makers; codes and standards users; professionals involved in design, installation, enforcement and maintenance; and community jurisdictions play in ensuring the public’s safety. He stated: “When any of those groups becomes complicit or lax in properly executing their roles and responsibili­ties, the consequences can be – and have been – catastrophic”. He noted the following potential contributing factors)

– The use of outdated codes and standards

– The use of outdated codes and standards

– The use of outdated codes and standards

– Ignoring referenced standards within a code

– Lack of education around the application of the codes and standards

– Reduced enforcement

– A public unaware of the dangers of fire

This TIA proposes the same changes in the text of NFPA 285 as was proposed by TIA 1264 on this document. The results of the voting on TIA 1264 was 19 in favor and 5 opposed with 2 absten­tions (on technical merit) and 18 in favor and 7 opposed with 1 abstention (on emergency nature). TIA 1264 was on the proposed 2018 edition of NFPA 285, which was returned to committee and Standards Council had no choice but to nullify the TIA because the proposed 2018 edition of NFPA 285 does not exist. The attached decision of Standards Council on the issuance of the TIA (follow­ing my appeal) includes the following statement: “Additionally, the appellant or any other interested party may choose to initiate a TIA on the existing (2012) edition of NFPA 285. Should such a pro­posed TIA come before the Council for processing, the Council will consider it promptly and in accordance with the Regs.”

Therefore, this TIA is being proposed on the 2012 edition of NFPA 285, which contains the same language and concerns

Emergency Nature: The standard contains an error or an omission that was overlooked during the regular revision process. The pro­posed TIA intends to correct a previously unknown existing haz­ard. The proposed TIA intends to offer to the public a benefit that would lessen a recognized (known) hazard or ameliorate a continu­ing dangerous condition or situation. The proposed TIA intends to accomplish a recognition of an advance in the art of safeguarding property or life where an alternative method is not in current use or is unavailable to the public. The proposed TIA intends to correct a circumstance in which the revised NFPA Standard has resulted in an adverse impact on a product or method that was inadvertently overlooked in the total revision process or was without adequate technical (safety) justification of the action.

The timing of this TIA is such that changes to the 2012 edition of NFPA 285 can be made in order for NFPA 285 to be able to be used in this new application for tall wood buildings in the next edi­tion of the International Building Code (and in the next edition of NFPA 5000). Following the traditional revision process for NFPA 285 will make it impossible for this to apply in the ICC for Tall Wood Buildings, particularly since the proposed 2018 edition has been returned to committee. In turn, this could even jeopardize the entire effort of including these buildings in the code. The current edition of NFPA 285 was dated 2012 and the next one will be dated 2023 or 2024.