How To Do Stairs With Composite Decking

How To Do Stairs With Composite Decking

Deck stairs can be one of the trickiest parts of building a deck. They must be properly supported, safe, and sturdy. While wood is a common material used for the construction of deck stairs, composite decking offers many benefits, including durability, low maintenance, and resistance to insects and rot.

If you are considering using composite decking for your stairs, this article will guide you through the steps to ensure that your stairs are well-constructed and beautiful.


Before you start building your stairs, you will need to gather the necessary materials. Here are some of the materials you will need:

– Composite decking
– Stringers
– Treads
– Risers
– Balusters
– Railings
– Concrete mix
– Screws
– Nails
– Adhesive


You will also need various tools to complete the task, including:

– Measuring tape
– Level
– Circular saw
– Jigsaw
– Drill
– Hammer
– Trowel

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Steps to Build Stairs with Composite Decking

Follow these steps to build safe and sturdy stairs for your composite decking:

Step 1: Measure the Height of Your Deck Rise

The first step is to measure the height from the deck to the ground. This measurement is the “rise” of your stairs. Divide this measurement by the desired number of steps to calculate the height of each step.

Step 2: Determine the Tread Height

The tread height is the distance between each step. The tread height will depend on the thickness of your composite decking and the number of stairs. The rise and tread height can be calculated using this formula: 2R + T = 25-26 inches.

Step 3: Cut the Stringers

Stringers are the support boards that run underneath the stairs and hold the treads and risers. Cut the stringers to length and angle them to fit the stair risers.

It is important to use pressure-treated lumber for the stringers to protect against rot and decay.

Step 4: Install the Stringers

Using a level, ensure that the stringers are properly aligned. Use concrete anchors and adhesive to secure the stringers to the deck.

Step 5: Install the Treads and Risers

Cut the treads and risers to length and install them on the stringers. Use screws to attach the treads to the stringers and adhesive to attach the risers.

Step 6: Install the Balusters and Railings

Install the balusters and railings, following the manufacturer’s instructions. Be sure to space the balusters evenly for safety.

Step 7: Finishing Touches

After the stairs are built, add finishing touches such as sanding and staining to enhance the look of your composite decking.

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Q: Can composite decking be used for stairs?

A: Yes, composite decking can be used for stairs. It is a durable, low-maintenance material that resists rot and insects.

Q: How is composite decking installed on stairs?

A: Composite decking can be installed on stairs by using stringers, treads, and risers. The stringers are installed first and the decking is attached to the stringers.

Q: What are the benefits of using composite decking for stairs?

A: Composite decking is low maintenance, durable, and resists rot and insects. It can also enhance the look of your outdoor space.

Q: How do I maintain composite decking stairs?

A: To maintain composite decking stairs, use a mild soap and water solution to clean them. Avoid using harsh chemicals or pressure washers, as they can damage the decking.

Q: Can I paint or stain composite decking stairs?

A: While composite decking can be painted or stained, it is not necessary as it already comes in a variety of colors.


Building stairs with composite decking takes time and preparation, but the result is a beautiful and durable addition to your outdoor space. With the right tools and materials, you can create safe and sturdy stairs that complement your composite decking. So, get started on your project today and enjoy your beautiful new stairs for years to come.

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