Installation Guide
Page 7
CONCEALoc
®
 Hidden Fastener
Important Information
CONCEALoc Hidden Fastener Installation Instructions
CONCEALoc Hidden Fasteners were designed exclusively to 
install TimberTech grooved and square shouldered planks.
  IMPORTANT! Read all instructions carefully and   
completely to ensure proper installation.
•  In areas with obstructed airflow such as roofs and on-grade 
applications, a minimum of 1-1/2” 
is required.
• Sleeper system must be supported by and connected to the 
substructure over which the deck is built. 
CONCEALoc Accessories
• 1,000-square-foot coverage. Includes stainless steel screws.
• CONCEALoc Gun Pail – 500-square-foot coverage for use with the 
fastener installation gun sold separately by TigerClaw. Includes 
quality coated pneumatic fasteners. Stainless steel fasteners for 
coastal applications available through TigerClaw.
• L-Bracket – avoid face-screwing by using the L-Bracket on first and 
last boards or as a butt seam clip to ensure a fastener-free surface.
• CONCEALoc Router Bit – cut a 2” wide groove on a solid plank for a 
perfect CONCEALoc fastener fit – even allows for cutting an installed 
plank over a joist.
• CONCEALoc screw packs available through
 www.timbertechstore.com.
• If using the CONCEALoc Gun Pail with the TigerClaw Installation Gun 
please refer to the retail packaging for further installation guidelines.
1
• Pre-drill with 5/32” drill bit and fasten outer 
edge of the first plank at each framing support 
1” from the edge using TOPLoc or a #8 x 
2-1/2” stainless steel or other high-quality 
coated deck screws. For a complete fastener-
free surface, the L-Bracket or Cortex can be 
used on first and last boards.
• For further instructions for the L-Bracket or 
Cortex, please refer to the instructions in the 
package.
INSTALL THE FIRST PLANK
2
• Fully insert the CONCEALoc fastener into 
grooved edge of plank. Screw hole should 
be lined up with the center of support joist.
POSITION CONCEALoc FASTENERS
TOOLS NEEDED
DrillSafety Glasses
Router with Slot 
Cutting Blade 
(Optional)
Incorrect
Incorrect
Correct
Correct










