HOW-TO GUIDES

How to Build a 12x16 ft Deck with Trex 

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Transform your backyard into an inviting retreat by adding a 12x16 foot deck. It’s the perfect size for family gatherings yet feels warm and intimate at the same time. Follow this step-by-step guide to build a new, perfectly sized deck with Trex that brings your outdoor vision to life.

Instructions provided by Trex® are based on the build specifications that Trex® demonstrated in the Trex® Academy video series and are not universal to all homeowners’ projects. A homeowner’s build may vary from Trex’s instructions based on the homeowner’s local municipality requirements, individual design preference and project specifications. For questions or assistance needed during your project, please reach out to howto@trex.com. 

8 minutes
32 Hours with a Team of 2*
*Timing is estimated for a ground-level deck with a picture frame border. This assumes the decking is installed parallel to the house and railings are installed on all sides of the deck and both sides of the staircase. Deck framing, railing posts, and lighting installation is not part of this estimate. For any home project, be certain to follow local code and permitting requirements.
0:00 / 0:00
01. Getting Started 00:00
02. Worksite Setup 00:36
03. Installing the First Board 01:36
04. Installing the Decking Field and Borders 05:29
05. Installing the Decking and Fascia Boards to the Stairs 11:06
06. Installing Deck Fascia 13:50
07. Installing Deck Railing 16:01
Step-by-Step Instructions
Chapter 01: Prep and First Steps
Print Instructions

So you're ready to get started? Watch our how-to tutorial before you start your build.

Before you begin any DIY project, make sure to wear the appropriate personal safety equipment. Eye protection, ear protection, gloves, long pants, a long-sleeved shirt, and reinforced toe shoes are recommended. Always make sure that you have a first aid kit nearby. 

For any home project, be certain to follow local code and permitting requirements. 

Step 1: Introduction and Project Overview

We’re starting our deck project with a completed pressure-treated lumber frame. For this tutorial, we’re using Trex Enhance® decking and fascia in the shade Rocky Harbor and pairing it with our Enhance railing to complete our 12x16 deck. If you're new to building a deck, learn all the parts of a deck.

Step 2: Prepare Your Workspace and Tools

Check that you have all the required materials and kits on-site. Then, set up your cutting area. 

Pro Tip

Arranging sawhorses parallel to the deck boards can help you work more efficiently. 

Essential hand tools for this project include a hammer, rubber mallet, speed square, pencil or marker, chalk line, tape measure, utility knife, and several clamps. In terms of power tools, be prepared with a drill, circular saw, jigsaw, and miter saw, all fitted with fresh blades and drill bits.

Step 3: Ensure Deck is Properly Supported

Proper support is essential for a stable and safe deck. Inspect the perimeter of your deck and locate the areas where deck boards will meet at right angles, creating a corner. Pay extra attention to the "picture frame" border as well, which is the outer edge of the deck.

Once you've identified these critical areas, reinforce them by adding additional joists underneath. Make sure these joists are cut to the correct length and are positioned perpendicular to the main deck boards for optimal support.

With your extra joists in place, use specific metal brackets called Simpson Strong Tie seven-inch angles or L70Z angles to firmly attach the joists to the frame. 

Pro Tip

To make your deck last longer, cover joists and beams with Trex Protect tape. This tape helps to keep water out and protect the frame from rot and wear.


Materials

2” Composite Color Matched Deck Screws

Fascia Screws

trex-academy-material-enh-raling-bk

Trex Enhance® Railing

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Tools

Bar Clamps

Circular Saw

Drill

Drill Bits

Jig Saw

Measuring Tape

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(NOT ALL PRODUCTS ARE AVAILABLE IN EVERY COUNTRY.)

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