commARCH Sept/Oct 2021 Issue - Page 33

Fire Endurance and Structural Integrity
As important as it is for a sheathing material like EXACOR™ to resist flame spread , the rest of the wall assembly needs to maintain structural integrity . That ’ s why the ASTM E119 test ( also referred to as ANSI-UL 263 ) is so important .
This test was created to evaluate how the collection of materials that make up an assembly work together to resist a controlled fire event . Some of the tested components in an exterior wall assembly include interior wall board , framing , insulation , and exterior sheathing . It ’ s a rigorous test in which assemblies are subjected to temperatures reaching in excess of 1600-degrees Fahrenheit to assess the amount of time the assembly can resist a fire event .
Again , the purpose of fire-resistance rated assemblies is to help a structure stay standing long enough for people to get out . Building codes refer to this as “ egress ” and thus an hourly fire-resistance rating is prescribed to assign the amount of time an assembly is expected to compartmentalize a fire and maintain its structural integrity to allow occupants time to exit safely .
Fire Resistance & Flexibility
The reason the fire resistance characteristics of EXACOR™ panels are so important is for the safety of people who live and work in the buildings in which they ’ re used . By limiting the spread of flame and helping to maintain an exterior wall ’ s structural integrity for prescribed periods , fire-resistance rated assemblies utilizing EXACOR™ panels can help provide precious time to allow occupants to evacuate in the event of a fire .
To learn more about EXACOR™ panels and assemblies , contact a sales representative , or request a sample at www . exacor . com .
1 . EXACOR™ panels may be used in specific published fire-resistant-rated assemblies as tested in accordance with ASTM E119 / ANSI UL 263 . Follow published fire-resistancerated assembly requirements and consult local building codes and designer of record for fire-resistant design requirements .
EXACOR™ panels again performed admirably under this testing , as the MgO formulation coupled with layers of glass fiber mesh allow the panels to resist burning while keeping the panels intact , thereby helping to prevent fire from penetrating into the wall cavity .
Currently , EXACOR has one- and two-hour fire rated assembly options and Huber Engineered Woods continues to test more assemblies and material combinations in order to build a portfolio of fire-resistance options for architects .
Flame Spread Along Building Façade
The critical failure at Grenfell Tower was that the fire spread from the interior of the building to the exterior , where it quickly burned the cladding and engulfed the building in flames .
To combat these types of scenarios , tests like NFPA 285 are used to evaluate fire propagation characteristics of exterior wall assemblies . This test is also focused on complete wall assemblies instead of individual products .
Exterior wall assemblies that are required to meet NFPA 285 by the building code must be able to demonstrate they can limit the spread of flame along the exterior façade . At the same time , they must also be able to resist the spread of fire from a lower compartment into an upper compartment via the exterior wall assembly .
Again , because EXACOR™ panels can resist flame spread and , as part of approved fire-resistance rated assemblies , help resist fire from penetrating into the wall cavity , they can be an excellent choice to help designers meet building code requirements for exterior wall assemblies that must comply with the NFPA 285 standard .
EXACOR TM panel vs . untreated plywood
WARNING : DO NOT TRY THIS AT HOME OR ON THE JOBSITE . EXACOR™ panels may be used in specific published fire-resistant-rated assemblies as tested in accordance with ASTM E119 / ANSI UL 263 . Follow published fire-resistance-rated assembly requirements and consult local building codes and designer of record for fire-resistant design requirements .
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