Preventing a Floor Truss Ban in Ohio. SBCRI/Qualtim TER Produces A Win for All Component Manufacturers (CMs)

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1 Preventing a Floor Truss Ban in Ohio SBCRI/Qualtim TER Produces A Win for All Component Manufacturers (CMs)

2 SBCRI/Qualtim Technical Evaluation Code Compliance Report on Floor Truss Comparative Fire Endurance Performance see TER No

3 Code Compliance Issue & Technical Assessment Code-adopted language and misinterpretation of this language causes potential competitive disadvantage for floor trusses in the market for CMs. R501.3 Fire protection of floors. Floor assemblies, not required elsewhere in this code to be fire resistance rated, shall be provided with a ½" gypsum wallboard membrane, 5 / 8 " wood structural panel membrane, or equivalent on the underside of the floor framing member. Exceptions: 4. other approved floor assemblies demonstrating equivalent fire performance. [emphasis added].

4 Technical Evaluation & Findings TER examines industry practices and test data as they relate to: Equivalency of unprotected truss performance when compared to 2x10 joists Requiring the application of a single layer of GWB to a floor system (R503.1) for the purpose of providing safety to firefighters and emergency responders during emergency operations. Metal plate connected wood trusses have an ASTM E119 unprotected fire test assembly performance of 10 minutes 12 seconds This performance exceeds the minimum 6 minutes 30 second performance of 2x10s. The following table shows that floor trusses have equivalent fire endurance performance to 2x10 unprotected joists based on ASTM E119 test data.

5 Technical Evaluation and Findings Wood truss ASTM E119 fire endurance test data shows assembly performance is equivalent to 2x10 joist performance.

6 Code Compliance Findings Floor trusses have equivalent fire endurance performance to 2x10 unprotected joists based on ASTM E119 test data and, therefore, meet the IRC equivalency requirement. All 12" or deeper wood trusses made from lumber that is greater than 2" thick, by 2" wide by 12" high nominal dimension or structural composite lumber meet this requirement / 2 " steel C-joists performed equivalent to the worst case 2x10 ASTM E119 test.

7 Additional Code Compliance Facts For Consideration Sprinklers provide best protection for all unprotected structural member applications in a fire. All unprotected structural elements perform in a very similar manner during a fire. All unprotected structural framing elements will generally fail in less than 15 minutes. As shown by the following table adding ½" gypsum wallboard provides the 2nd best protection for all unprotected structural member applications in a fire.

8 Table (1) Time Assigned to Wallboard Membranes a,b,c,d Description of Finish Findings Time e (minutes) 3 / 8 " wood structural panel bonded with exterior glue 5 15 / 32 " wood structural panel bonded with exterior glue / 32 " wood structural panel bonded with exterior glue 15 3 / 8 " gypsum wallboard 10 1 / 2 " gypsum wallboard 15 5 / 8 " gypsum wallboard 30 1 / 2 " Type X gypsum wallboard 25 5 / 8 " Type X gypsum wallboard 40 Double 3 / 8 " gypsum wallboard 25 1 / 2 " + 3 / 8 " gypsum wallboard 35 Double 1 / 2 " gypsum wallboard 40 For SI: 1" =25.4mm a. These values apply only when membranes are installed on framing members which are spaced 16" o.c. or less. b. Gypsum wallboard installed over framing or furring shall be installed so that all edges are supported, except 5 / 8 " Type X gypsum wallboard shall be permitted to be installed horizontally with the horizontal joints staggered 24" each side and unsupported by finished. c. On wood frame floor/ceiling or roof/ceiling assemblies, gypsum board shall be installed with the long dimension perpendicular to framing members and shall have all joints finished. d. The membrane on the unexposed side shall not be included in determining the fire resistance of the assembly. When dissimilar membranes are used on a wall assembly, the calculation shall be made from the least fire-resistant (weaker) side. e. The time assigned is not a finished rating.

9 TER Process for Accurate & Efficient Product Development TERs are developed from test reports that comply with IBC Section Research reports: Supporting data, where necessary to assist in the approval of materials or assemblies not specifically provided for in this code, shall consist of valid research reports from approved sources. If you have an idea for a new product, check out SBCRI s streamlined TER approach. It s the quick and easy way to bring your product to market. SBCRI Qualtim TERs

10 TERs Qualify for Building Official Approval per Model Building Code Language & PE Laws SBCRI is a code defined Approved Agency SBCRI is a code defined Approved Source Qualtim is a code defined Approved Source SBCRI Qualtim TERs Contact: Kirk Grundahl, P.E kgrundahl@qualtim.com qualtim.com sbcri.info