Installation Guide
7 FIBERONDECKING.COM
Cortex Hidden Surface Fastener Installation
FASTENING REQUIREMENTS
The Fiberon Cortex
®
hidden surface fastening system is the fastest,
easiest way to hide deck screw heads on stairs, perimeter boards,
and square edge deck surface boards. It is also the ideal fastener
to use when replacing a deck board. The Cortex plugs are available
in a variety of colors to match Fiberon deck boards (not for use
with ArmorGuard, Sanctuary, Good Life, Veranda, or any fascia or
riser boards).
Screw
Cortex Cortex Cortex
Bit Plug
IMPORTANT: For a full written warranty, additional information, or technical assistance, please visit berondecking.com.
The Fiberon Cortex hidden surface-fastening system is designed for traditional elevated deck surfaces. The following applications require a
different fastening method or further instructions and will nullify the Cortex fastener warranty:
□ Sleeper systems: Framing rests directly on the ground or roof deck
□ Over solid wood surfaces
□ Docks or decks with framing members in constant contact with water
□ Restricted airspace where there is less than 1-1/2 in. (38.1 mm) of clearance on two sides of the deck
□ “Tear-offs” that utilize old framing as support for new decking
□ Deck materials other than 15/16 in. (24 mm) standard thickness with at bottom prole
INSTALLATION
1
Pre-drilling fastener holes
NOTE: Pre-drilling is required at board ends and where
temperatures are below 40°F.
NOTE: Double joists are required at end-to-end seams.
Locate all fastener holes at least 1-1/2 in. (38.1 mm) from board
ends and 1 in. (25.4 mm) from board sides. To prevent cracking at
fastener locations, pre-drill all holes with a 1/8 in. (3.2 mm) or 5/32
in. (4 mm) drill bit. Keep the drill perpendicular to the deck surface
in order to create the proper pilot hole and remove excess material.
NOTE: For best results, use a corded or battery power, variable
speed, high-torque drill or impact driver. Starting screws slowly
will help initial engagement. Always keep continuous pressure
downward while driving screws.
Deck board
1-1/2 in.
(38.1 mm)
1 in.
(25.4 mm)