The Fabral Box Rib HCF (horizontal concealed fastener) System is available in a range of profiles and configurations for architectural, commercial and industrial applications. With one to four ribs, this strong, durable wall panel system provides design versatility and performance. An interlocking sidelap hides fasteners and can be installed with or without clips to accommodate thermal movement

Box Rib HCF 2aC, 2C, 2wC, 3C
Box Rib HCF Series concealed fastener wall panels seamlessly integrate with adjacent materials, windows and design elements.


Panel Options Available: Multiple Panel Profiles Designs with both 12″ and 16″ options Check with local sales representative for availability of 20GA and 18GA steel options and .040 - .050 aluminum options. Subject to change without notice.
Substrate Offering:
.032″ Aluminum .040″ Aluminum .050″ Aluminum 18 Gauge Steel 20 Gauge Steel 22 Gauge Steel 24 Gauge Steel
Panel Features:
Factory Applied Sealant
Product Installation: Install panels plumb, level and straight so they are weathertight and without waves or other distortions that may limit thermal movement. Apply sealant tape or caulking as necessary at flashing and panel joints to prevent water penetration.
Product Maintenance & Warranty: Use proper care to ensure the durability of Box Rib HCF panels. Remove filings, grease, stains, marks or excess sealants from roof panel system to prevent staining. Store panels and flashings in a safe dry environment. Box Rib HCF has a 30-year finish warranty against cracking, chipping, peeling, fading and chalking.
Panel Width: 12", 16"
Hail Resistance: UL 2218 Class 4 Hail Impact Resistance
Fire Resistance: UL 790 Class A Fire Resistance
Maximum Panel Length: 30′
Minimum Panel Length: 2′

Wind Uplift Table

PANEL/SUBSTRATE SPANS 2'-0" 2"-6" 3'-0" 3'-6" 4'-0"
24 GA Steel 3 54 48 43 38 33
22 GA Steel 3 60 53 48 42 37
.032 Aluminum 3 48 42 36 30 24