TimberTech CONCEALoc Hidden Fasteners

TimberTech CONCEALoc Hidden Fasteners deliver a completely fastener-free deck surface using SAE 304 austenitic stainless-steel clips that vanish between boards. The system installs either manually with the included T15 star-drive bit or pneumatically with the TigerClaw tool, making it adaptable to both small residential jobs and large commercial projects.

Professional contractors can achieve installation rates up to 400 square feet per hour using the pneumatic method — critical efficiency for Montana’s compressed building season. The 45-degree screw angle drives directly into the joist center, creating rock-solid connections that handle the freeze-thaw expansion cycles that destroy lesser fastening systems.

Material Specifications and Installation Efficiency

The clips use SAE 304 austenitic stainless-steel construction — not the cheap 201-series steel that rusts after two winters. This grade resists corrosion from snow melt, de-icing salts, and the constant moisture that pools between deck boards during spring thaw. Brown-colored clips blend with wood framing shadows rather than drawing attention like silver fasteners would.

Specification	Value
Clip Material	SAE 304 austenitic stainless-steel
Screw Material	Stainless-steel or corrosion-resistant carbon-steel
Gap Spacing	3/16 inch (approx. 4.8 mm)
Fastener Angle	45-degree screw drive angle into joist center
Screw Size	Typically #8 x 2-1/2 inches (hand-driven)

The toothed edge design grips grooved boards with enough holding power to prevent the board creep that plagues smooth-edge clips. The system maintains consistent 1/8 to 3/16 inch spacing — tight enough to prevent debris accumulation but wide enough for proper drainage and ventilation.

Three kit sizes match real-world project scales:

• 100 sq ft kit: 175 clips + 184 screws
• 500 sq ft Gun Pail: 900 clips + 925 screws
• 1000 sq ft Bulk Bucket: 1,750 clips + 1,840 screws

The math works out to approximately 1.75 clips per square foot — contractors can calculate material needs without the guesswork that leads to multiple hardware store runs.

Compatibility and Real-World Limitations

CONCEALoc works with TimberTech Advanced PVC (AZEK) and TimberTech Composite (PRO and EDGE) grooved boards. The system is not compatible with steel or aluminum framing — the 45-degree installation angle requires wood joists that accept screws.

For contractors stuck with solid-edge boards, TimberTech sells a CONCEALoc router bit (1/4-inch shank, 3-wing carbide tipped) that cuts grooves. This adds labor but salvages jobs where grooved boards weren’t specified originally.

Professional contractors on forums like Contractor Talk appreciate the product’s cutting accuracy and effective fastener concealment. The consistent feedback centers on installation speed and the genuinely hidden finish — no visible fastener heads to collect dirt or create visual disruptions.

Montana-Specific Performance

The 25-year residential warranty and 10-year commercial warranty cover material defects and rust/corrosion failure. In Montana’s extreme temperature swings — where a chinook can raise temps 40 degrees in hours — that corrosion resistance matters. Cheap zinc-plated fasteners fail within five years, leaving rust streaks that permanently stain composite decking.

The stainless steel construction handles UV exposure at elevation without degrading. At 3,000-4,000 feet, Montana decks see intensified UV that breaks down inferior materials faster than manufacturer testing predicts.

For angled deck patterns up to 45 degrees, offset the fastener center 1/2 inch toward the long side of the joist. This detail matters for the diagonal deck boards popular on lakefront properties where views dictate non-standard layouts.

Reviews average 4.7 out of 5 stars, with the main complaint being individual board replacement difficulty compared to face-screwed boards. Fair point — replacing a damaged board mid-deck requires removing multiple boards to access the hidden clips. Smart contractors address this by keeping replacement boards and extra clips on hand for clients.

---

FAQ

Can CONCEALoc fasteners work with other brands of composite decking? No. CONCEALoc is designed specifically for TimberTech Advanced PVC (AZEK) and TimberTech Composite (PRO and EDGE) grooved boards. Competitor products like Trex Hideaway use different spacing (1/4 inch vs CONCEALoc’s 3/16 inch).

Do I need special tools for installation? For manual installation, you need a standard drill/driver and the T15 star-drive bit included in kits. For faster installation, the TigerClaw pneumatic installation tool (sold separately) significantly speeds up large projects.

How much faster is pneumatic installation versus manual? Pneumatic installation achieves up to 400 square feet per hour. Manual installation rates vary by contractor experience but typically run 100-150 square feet per hour.

Can these fasteners handle Montana’s freeze-thaw cycles? Yes. The SAE 304 austenitic stainless-steel clips resist corrosion from repeated moisture exposure and temperature cycling. The 25-year residential warranty covers rust and corrosion failure.

What about installing on treated lumber joists? CONCEALoc works with wood joists. The system drives screws at 45 degrees into the wood — standard treated lumber accepts these fasteners without splitting when properly installed.