A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Scope 1. The apparatus, materials, and procedure used to apply the SFRM for laboratory tests shall be the same as is used for the construction of either of the test assemblies described in Test Methods E and E It is the responsibility of the user of this standard to establish appro- priate safety and health practices and determine the applica- bility of regulatory limitations prior to use.
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Sprayed fire-resistive materials, bond strength, and the IBC February 5, by John Dalton Sprayed fire-resistive materials SFRMs are passive fire-protection materials intended for direct application to structural building members. They are predominantly cementitious or mineral-fiber-based, with the fire-resistive qualities and physical characteristics varying widely between the respective types.
As a consequence, the code change has an impact on the selection process of SFRMs for projects being constructed that were permitted under the or later version of the code. Of these three physical properties, only bond strength has requirements specifically outlined by the code. In the case of application thickness and density, the code states these properties must meet the requirements of the approved fire resistance design.
These properties require special inspection as required in IBC Chapter The code maintained the 7. In fact, IBC added two new bond strength requirements by segmenting buildings in categories of The minimum bond strength for SFRM for buildings greater than It must be noted the minimum bond strength requirement for the SFRM must be installed throughout the building.
The specification community will need to consider these bond strength requirements when specifying SFRM on any projects designed under the IBC or later edition. Plan reviewers also need to keep this in mind as they review construction documents during the permitting process. Though the new code must be considered when developing criteria for bond strength in a specification, the new bond strength requirements have no impact on any other physical property criteria for the SFRM in a specification.
For example, the new code language has no impact on density requirements. The selection of density criteria is an independent decision to the required minimum bond strength as dictated by the IBC. Traditionally, SFRMs have been divided into three distinct product groupings based on their density.
There were: low-, standard-, or commercial-density i. The cost difference is driven primarily by the applied yield of the materials. As density increases, the applied yield of the material decreases and applied cost increases. Some have also attempted to correlate bond strength with cost, but the same correlation does not exist.
Until recently, the only way to meet the new code requirements was to specify a medium-density SFRM product. This is because the market had lacked low-density products that could achieve bond strengths in excess of As a result, medium-density products are being specified in applications where a standard density product would meet all the requirements with the exception of bond strength.
A prime example of this is when the SFRM is to be concealed once the building is complete in those structures taller than This practice has created the misconception medium-density SFRMs must be specified to meet the new building code high-rise building requirements.
This is no longer the case. Over the last year, several new low-density products can achieve the required high-rise bond strength requirements. The introduction of these products has created more cost-effective solutions to meeting IBC bond strength requirements. Using these such products offers significant advantages to the building owner and manager.
Prior to the new bond requirement, designers must consider several factors when selecting the appropriate SFRM for a project: Will the SFRM be for interior or exterior applications? Will the SFRM be concealed or exposed? Will the SFRM be merely exposed to view, or will it experience abrasion? If exposed to abrasion, what is the anticipated level? Does the SFRM need to be damage-resistant? Will the SFRM be exposed to high humidity?
Now, for buildings being designed in accordance to the or later version of the IBC, the following question must also be added: How tall will the building be? With the introduction of the new high-bond, low-density products, the design has more flexibility in selecting the products meeting all requirements versus choosing a product that meets the new bond requirements, but exceeds all the others at a higher cost. John Dalton is technical service manager of fire protection at Grace Construction Products.
He has more than a decade of experience in the industry, providing technical assistance to architects, building officials, and contractors in the fireproofing area. Dalton can be reached john.