Can You Build Stairs with Composite Decking

Building stairs with composite deck boards can be a rhetorical question for many homeowners, and it's easy to see why. Composites have become incredibly popular for decking due to their longevity, low maintenance, and aesthetic appeal. But when it comes to using them for stairs, things can get a bit complex. So, can you use composite deck boards for stairs? Let's delve into this question, exploring the pros, cons, and best practices.

Composite decks have revolutionized outdoor living spaces, but their application to stairs isn't as straightforward. Composites are essentially a blend of recycled plastic and wood fibers, which makes them incredibly durable and resistant to rot, insect damage, and fading. However, they also have some properties that might make you think twice before using them for stairs.

Understanding Composite Deck Boards for Stairs

Before we get into the details, let's clarify what we're talking about. When we mention "composite deck boards for stairs," we're referring to using these materials to construct the stringers, treads, and risers of your staircase. We're not talking about using composites for the decking around your stairs.

Composite deck boards are typically manufactured in various sizes, with lengths ranging from 8 to 20 feet and widths varying from 5 to 6 inches. While this offers flexibility in design, it's essential to understand that these standard sizes might not directly translate to the typical stair dimensions, which usually require narrower treads and wider risers.

Pros of Using Composite Deck Boards for Stairs

Despite the dimensional challenge, using composite deck boards for stairs has its advantages. Firstly, composites offer excellent durability, ensuring longevity for your staircase. Unlike wood, composites won't warp, crack, or succumb to rot, even when exposed to moisture and harsh weather conditions.

Moreover, composites require minimal maintenance. You won't need to stain, paint, or seal them annually like traditional wooden stairs. Simply cleaning them a couple of times a year with mild soap and water is usually sufficient to keep them looking new.

Cons of Using Composite Deck Boards for Stairs

The primary disadvantage of using composite deck boards for stairs is their structural integrity. Composites are not as strong as pressure-treated lumber when it comes to bearing weight, especially over long spans. This could pose a problem, as stair stringers need to support the weight of the treads and anyone walking on the stairs.

Another downside is the cost. Composite deck boards are more expensive than pressure-treated lumber. While they might save you money in the long run due to their durability, the initial cost can be inhibitive, especially for a considerable staircase project.

Best Practices When Using Composite Deck Boards for Stairs

If, after considering the pros and cons, you've decided to use composite deck boards for your stairs, there are some best practices to keep in mind.

Firstly, always use pressure-treated lumber for the stair stringers. While composites can be used for treads and risers, they're not strong enough to bear the weight of a staircase. Pressure-treated lumber provides the necessary strength and longevity for this critical role.

Designing Stairs with Composite Deck Boards

When designing your stairs, consider using narrower composite deck boards for the treads to achieve the standard depth of around 10 inches. You might need to use multiple boards side-by-side to achieve this, which is perfectly fine as long as you ensure the boards are securely fastened together.

For risers, you can use wider composite boards, but remember that standard stair riser heights range from 7 to 8 inches. If you need to trim your composite boards to achieve this, ensure you're cutting along the grain to prevent weaken the board's structure.

Installation and Maintenance

During installation, ensure you're using proper fasteners specifically designed for composite materials. Using regular nails or screws could lead to cracking or splitting of the boards.

As for maintenance, while composites are low maintenance, it's still essential to keep them clean to prevent dirt and debris from building up and causing damage over time. Regularly inspect your staircase for any signs of wear and tear, and address any issues promptly to ensure the longevity of your composite stairs.

In the end, whether or not to use composite deck boards for stairs depends heavily on your specific needs, budget, and local building codes. While composites offer significant benefits in terms of durability and low maintenance, they might not be the best choice for every staircase project. Regardless of your decision, always ensure that your staircase is structurally sound and adheres to safety guidelines.

So, the next time you ponder, "Can you use composite deck boards for stairs?", remember that while it's possible, it's also essential to consider all factors and follow best practices for a safe, durable, and aesthetically pleasing staircase.