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American Wood Council
WELCOME ICC CODE OFFICIALS!

You have landed on this AWC webpage by following the link provided in the International Code Council's Final Action Agenda. Code changes and corresponding challenges highlighted on this page will be considered by the ICC membership during the final action hearing in Portland, Oregon, October 22 -24, 2012.

We encourage you to review the additional information provided by the links below and ask that you support the positions of the American Wood Council. Thank you.

1. CHANGE NUMBER: FS22 – STRUCTURAL INTEGRITY OF EXTERIOR WALLS

PROPONENT: Jon Siu – City of Seattle

DESCRIPTION: The proponent points out that the current text requires the exterior wall to be structurally stable and to remain in place for two hours of fire exposure. However, that is very different than requiring a fire resistance rating of two hours. There is no definition of what exposure is to be resisted, how stability is measured or how to determine that before a fire occurs. The proponent says the code text is unenforceable.

AWC agrees with the proponent's assessment of the difficulties with the current text. AWC supports the challenge. AWC believes that the second sentence of the existing language only makes sense in the context of the first sentence. If Mr. Siu's comment is approved as we believe it should be, then the second sentence should also be deleted. The AWC comment proposes to do just that for the reasons stated here and in the Public Comment.

ICC FINAL ACTION: Approved as modified

AWC CHALLENGE:

FS22 Challenge.pdf

2. CHANGE NUMBER: G141 – RECOGNIZE STRUCTURAL COMPOSITE LUMBER (SCL) IN TYPE IV CONSTRUCTION

PROPONENT: Sam W Francis – American Wood Council

DESCRIPTION: Adds reference to structural composite lumber (SCL) into the section on Type IV Construction (HT) based on equivalency to heavy timber and glulam.

ICC FINAL ACTION: Approved as submitted

AWC CHALLENGE:

G141-12 (PDF Format)

SCL FIRE TEST REPORT (FPL-RP-633):

Abstract. Use of structural composite lumber products is increasing. In applications requiring a fire resistance rating, calculation procedures are used to obtain the fire resistance rating of exposed structural wood products. A critical factor in the calculation procedures is char rate for ASTM E 119 fire exposure. In this study, we tested 14 structural composite lumber products to determine char rate when subjected to the fire exposure of the standard fire resistance test. Char rate tests on 10 of the composite lumber products were also conducted in an intermediate-scale horizontal furnace. The National Design Specification/Technical Report 10 design procedure for calculating fire resistance ratings of exposed wood members can be used to predict failure times for members loaded in tension. Thirteen tests were conducted in which composite lumber products were loaded in tension as they were subjected to the standard fire exposure of ASTM E 119. Charring rates, observed failure times in tension tests, and deviations from predicted failure times of the structural composite lumber products were within expected range of results for sawn lumber and glued laminated timbers.

The full report is available by clicking here.
3. CHANGE NUMBER: G142 – INTRODUCES CROSS-LAMINATED TIMBER IN TYPE IV CONSTRUCTION

PROPONENT: Sam W Francis – American Wood Council

DESCRIPTION: Allows Cross Laminated Timber (CLT) to be used for walls and floors in Type IV construction.

ICC FINAL ACTION: Approved as submitted

AWC CHALLENGE:

G142-12, Part I (PDF Format)

PRELIMINARY CLT FIRE TESTS (July 2012):

Summary: FPInnovations is involved in a large research project regarding CLT construction. One objective of this research is the creation of a design methodology for calculating the fire-resistance of CLT assemblies/construction. This methodology will foster the design of fire-safe buildings of wood or hybrid construction. In order to establish such calculation methods, a series of experimental tests has been undertaken. A total of eight full-scale CLT fire resistance tests have been conducted at the NRC fire laboratory where the panels were subject to the standard ULC S101 [1] fire exposure. The series consisted of three wall and five floor tests. Each test was unique using panels with a different number of plies and varying thicknesses. Some of the assemblies were protected using CGC Sheetrock® FireCode® Core Type X gypsum board while others were left unprotected.

Preliminary-CLT-Fire-Test-Report-FINAL-July2012.pdf

On October 4th, the American Wood Council (AWC) conducted a successful ASTM E119 fire resistance test on a CLT wall at NGC Testing Services in Buffalo, NY. The wall, consisting of a 5-ply CLT (approximately 6-7/8 inches thick), was covered on each side with a single layer of 5/8" Type X gypsum wallboard. The wall was loaded to the maximum load attainable by the NGC Testing Service equipment. The test specimen lasted 3 hours, 5 minutes, and 57 seconds (03:05:57). The US CLT Handbook project provided funding for this fire test.

NGC-CLT-Report.pdf

4. CHANGE NUMBER: S281 AND S283 – SPAN TABLES FOR JOISTS, RAFTERS, AND HEADERS

PROPONENT: Paul Coats - American Wood Council

DESCRIPTION: Ensure the 2015 IBC and 2015 IRC contain identical spans for wood joists, rafters, and headers.

ICC FINAL ACTION: Approved as modified

AWC CHALLENGE:

S281 and S283 Challenge PDF

The purpose of AWC public comments to S281 and S283 is to ensure the 2015 IBC and 2015 IRC contain identical spans for wood joists, rafters, and headers. These public comments provide the best mechanism to create consistency between codes. If disapproved, there is no other reasonable means to correct spans in the IBC, which will be greater than spans recommended by AWC.

The American Lumber Standard Committee (ALSC) Board of Review approved changes to design values for 2"- 4" thick, 2"- 4" wide, Southern Pine #2 Dense and 2x4 Mixed Southern Pine #2, and all lower grades (i.e. #3, Stud, Construction, Standard, and Utility). The changes became effective on June 1, 2012 (visit www.spib.org and www.southernpine.com for more details.) In October 2012, the ALSC Board of Review will consider additional changes to Southern Pine design values, including some wider widths.

Due to the timing of ICC submittal deadlines for proposed changes to the 2015 IBC, it was not possible to update lumber span tables. These two challenges will defer action on the IBC tables until the 2015 IRC code development cycle in 2013. AWC strongly encourages approval of these changes to ensure the spans are identical in the IBC and IRC. Further, this action for approval will minimize the need for local, regional, or state amendments to the IBC.
 
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