How to Install a Deck with an Undermount Clip How to Install a Deck with an Undermount Clip

What You'll Need
Hand Gloves
Safety Goggles
Circular Saw
Mitre Saw
Power Screwdriver
Hammer (Use Rubber Face for Composite Decking Material)
Undermount Clips
Rust-proof Screws
Support Rails or Joists
New Decking Boards made of Composite Material or Wood
Deck End Cover Strip

Using a deck clip to install composite material or wood decking may sound technical, but is not necessarily a complicated task.  Deck clips make your deck installation easier and faster, so you can complete the job on your own in just a matter of a few hours. To install a deck with an undermount clip, follow these steps.

Step 1 – Get the Area Ready

Observe safety by wearing proper working clothes and protective gear, such as gloves and safety goggles. Get the materials and tools ready. Free up the surroundings from unnecessary litter or furniture. Ensure that the foundation is well-prepared, preferably concrete, and the joists are firmly attached across the support posts.

Step 2 – Laying the First Board and the Undermount Clips

Fix the first board on the joists with longer screws applied at 45-degree angles that pass through the bottom tongue of the board’s outside edge. Pre-drill the screw points with oval shaped holes on the wider side aligned to the length of the board. Pay extra attention to the alignment of board, as the edge must be straight. Fix the undermount clips along the edge at the top of the joist. Do this alternately to subsequent boards over the joists. Use the rust-proof screws to secure the clips via its holes positioned at the side of the joist. Position the next deck board and attach with the clip screwed through its holes and the other side of clip to the joists.

Step 3 – Install Additional Boards on Deck

Continue with the other boards and install them at deck level. When using composite material, only use a hammer with a rubber face and tap lightly the board to insert it into place. Do this activity to the rest of the boards. If deck is too long and there is a need to install an additional board at the end of the last board, cut the end of last board to the exact location of the nearest support rail or joist. Put in the additional rail and then install the additional board, starting on the second/additional rail.

Step 4 – Installing the Last Board on Deck

Before attaching the last board into the deck, install decking boards first to the side of the support rails or joists. Level the top of the edge of the decking board to the top edge of the support rail. Use the mitre saw to make an angled cut to join corners neatly. Drive in screws into the side board at a 45-degree inclination to fix it. Attach the last board on the deck, covering both the support rail and the edge of the side board. Drill a pilot hole larger than the screw head ½ inch deep on top of the last board and drive the deck screw on the same hole towards the joist below. Plug the screw hole with a wood piece to hide it from the surface. Do this on other location of same board on top of each joist.

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