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Exposed Fastener (EF) System Overview

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  • Simple, economical and flexible fastening system
  • Color matching or accent fasteners 
  • Ideal for large format panels, planks, complex geometry 
  • Easily adjusts around windows and other complicated geometry 
  • Factory fabrication to any size, design with 48” x 96” in mind 
  • Three panel types: Class A-285, Class A, Class B
  • NFPA 285 compliant assembly using Class A-285 8mm panels 
  • Exposed Fastening Miami-Dade County NOA#21-0722.02
  • Florida Product Approval using Class A 10mm panels, FL27934
  • FSC® (FSC-C115183) certification available





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NFPA Class A 10mm EF Speed icon 01 EF Stack Installer 01
Markets We Serve


Architectural Design


Design Build

Tudor BeforeAfter



Preferred Domestic Manufacturer

NFPA 285 Compliance

EF NFPA 021722 web text callouts




Stonewood 8mm, Class A panels attached with the EF system have received compliance certification for NFPA 285 fire test. Learn more about the configuration and details.


Design Offering

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EF Panel Sizes

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Thickness Panel Size Before Fabrication Weight Per Panel Weight Per sq.ft.
5/16" 48" x 96" 72 lbs 2.25 lb/sq.ft.
3/8" 48" x 96" 86 lbs 2.69 lb/sq.ft.
1/2" 48" x 96" 115 lbs 3.59 lb/sq.ft.


Panel-To-Panel Joints

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For Exposed (EF) System, a minimum distance of 3/8" must be
maintained between planks to accomodate hygrothermal movement.


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