Installation Guide
Page 11
1
•  Pre-drill deck board with a 3/16” 
drill bit
PRE-DRILL
2
• Using Setting Tool provided, drive 
screw at medium or high speed until it 
disengages at the proper level below 
the deck surface. 
• Drive at one continuous speed, 
do not slow down.
• Install two screws into decking at 
each joist. 
• Maximum spacing between each row of 
screws should be 16” on center.
DRIVE SCREWS INTO JOISTS
3
• Place plug into cored hole and 
gently tap flush with deck surface.
• If mushrooming occurs, stop 
installation and call customer service 
at 1-800-307-7780.
INSTALL PLUG
Cortex
®
 Hidden Fastening System










