The Best Deck Fasteners for TimberTech Azek Decking

When it comes to building a deck, choosing the right fasteners is crucial for both the longevity and appearance of your outdoor space. TimberTech offers high-quality decking materials, including Azek PVC decking and composite decking, each with specific requirements for fasteners.

In this blog post, we’ll explore the recommended deck fasteners for TimberTech Azek decking to help you make an informed decision for your next decking project.

TimberTech Azek Square Shoulder Decking Fasteners

TimberTech Azek decking is made from capped polymer and is designed to provide superior weather resistance and longevity. For Azek decking, the recommended fasteners are:

  1. Cortex Hidden Fastening System: This system is designed specifically for TimberTech Azek decking. The fasteners are hidden beneath the surface, providing a clean, seamless look. The screws are made from high-quality, corrosion-resistant material, ensuring durability.
  2. TOPLoc Fastening System: TimberTech recommends the TOPLoc fastening system. These color-matched screws are designed to minimize the visibility of the fasteners and reduce the risk of expansion and contraction.
  3. SIDELoc™ Fasteners: If you prefer a different hidden fastening system, TimberTech Azek decking also recommends SIDELoc™ made with CAMO technology. These fasteners provide a secure hold while maintaining a clean deck surface.

TimberTech Azek Grooved Decking Fasteners

TimberTech Azek grooved decking is made with grooves in the edges of the deck boards to accommodate hidden deck fasteners. This allows for faster and easier installation of your TimberTech deck boards without creating any screw holes in the face of the deck boards:

  1. CONCEALoc Hidden Fasteners: This hidden fastening system is designed specifically for TimberTech composite decking. The fasteners create a consistent spacing between the boards and are hidden from view, providing a clean, finished look.
  2. FUSIONLoc Hidden Fasteners: Another option for hidden fastening is the FUSIONLoc system. This system provides a strong hold and a seamless appearance, with fasteners that are virtually invisible once installed.

Important Warning From TimberTech:

TimberTech warns against using non-TimberTech fasteners as it can void your warranty. Some contractors use the same fastening system on all their deck builds because it saves them time and money. Unfortunately this can void your warranty.

Below is the warning taken from the TimberTech installation manual:

Trex Hideaway plastic clips, Hidfast™, CAMO™ screws/clips, and all non-TimberTech fasteners should not be
used with TimberTech AZEK decking. These fasteners are known to cause issues during or after deck installation, including but not limited to gapping, warping, board movement, oil canning, squeaking, corrosion, breaking/snapping of fasteners and uneven deck surfaces. The AZEK Company will not be financially liable in the event such issues arise. Damaged products will not be covered under warranty.

Click here for the full TimberTech Azek installation manual.


Choosing the right fasteners for your TimberTech decking is essential for both the aesthetics, longevity and ease of installation of your deck. For Azek decking, the Cortex Hidden Fastening System, TOPLoc Fastening System, and SIDELoc™ Hidden Deck Fasteners are excellent choices. Whichever option you choose, ensure that the fasteners are compatible with your decking material and are installed according to TimberTech’s guidelines for the best results.

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