Stonewood 10mm Exterior Architectural Panels received compliance certification for the NFPA 285 fire test. Testing was conducted on January 27, 2015 in accordance with the applicable requirements and following the standard methods of NFPA 285 Standard Test Method for Evaluation of Fire Propagation Characteristics of Exterior Non-Load-Bearing Wall Assemblies Containing Combustible Components, 2012 Edition.

The overall visual and thermal test results indicate that Stonewood Exterior Panels passed NFPA 285. Stonewood panels can be used on any height buildings. View updated testing criteria and data here.

The wall assembly consisted of the following components:

Interior Sheath 5/8" type X gypsum wallboard
Stud 25 GA. 3 5/8" 24 in. OC w/lateral bracing very 4 ft.
Cavity Insulation None except 4 inch 4 pcf Thermafiber floor line fire-stops at each cavity
Exterior Sheath 1/2 in. exterior gypsum sheathing
Water Resistive Barrier RevealShield SA Self-Adhered manufactured by VaproShield
Exterior Insulation 2 inch mineral fiber (Roxul Cavity Rock)
Exterior Water Resistive Barrier None
Gap 1 in.
Exterior Cladding 10mm Stonewood Exterior Architectural Panel, Class A mounted using Northclad® exposed fastener with insulation method.


What is NFPA 285?

NFPA 285 is the standardized procedure for fire testing of exterior walls when combustible materials, such as foam plastic continuous insulation, panels, and water-resistive barriers (WRBs), are components within the wall assembly.

The stringent test provides a specific method of determining the flammability characteristics of complete exterior, non-load-bearing wall assemblies/panels. Designed to emulate the actual fire-resistance performance of the wall assembly in a constructed building, NFPA 285 evaluates combustible components within wall assemblies for buildings required to be of non-combustible construction.

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 NFPA 285 Test Wall Configuration

NFPA 285 Article thumb
NFPA 285: What you Need to Know
Author: Jesse J. Beitel
Source: Journal of Building Enclosure Design