Installation Guide

Page 8
Restricted Cortex Uses
The AZEK Cortex System is designed for traditional
elevated deck surfaces. The following applications require
a different fastening method:
• Sleeper systems: Framing rests directly on the ground
or roof deck.
• For attaching fascia boards: AZEK Cortex should
not be used.
• Docks or decks with framing members in constant
contact with saltwater.
Important Information
• The Cortex Setting Tool must be used to set the Cortex
screw to the proper depth.
• The Cortex fastener must be driven perpendicular to
the deck surface for proper fit and ideal finished look.
• The cored hole must be free of debris or moisture. Use
a smooth plastic hammer head to set the Cortex plug.
• The interaction between the deck board, screw, and plug
is essential. Use of non-Cortex Screws or non-Cortex plugs
will nullify the warranty.
Pre-Drilling is Required When:
• Installing in extreme temperatures (where temperature is
below 40º or above 80º F)
• Installing into old framing or joists
In these cases, drill a 3/16” pilot hole through the deck board
(not joist) prior to installation. Install 10 or more Cortex
screws and plugs to check for finished appearance before
continuing. If you experience any issues, stop installation and
contact AZEK.
Cortex
®
Hidden Fasteners Installation