Installation Guide

Page 11
Restricted Cortex Uses
The TimberTech 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: TimberTech TOPLoc should be used.
• Docks or decks with framing members in constant contact
with saltwater.
• Deck materials with a scalloped bottom such as, but not
limited to Reliaboard, Earthwood Evolutions, and Terrain
Collection.
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
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.
End and Edge Distance Minimums
• Pre-drilling is required for installation into Earthwood Evolutions decking.
• Pre-drilling is required when installing Cortex fasteners less than 1”
from the end and 1” from the edge of a TimberTech deck board.
• Pre-drilling is also required at butt joints. Common building
practices dictate that you “sister” an additional joist at your butt
seam connections.
• Pre-drilling should be done with a 5/32” drill bit to create the
proper pilot hole.
Cortex
®
Hidden Fastening System