What is Hollow Composite Decking?
Hollow composite decking is a type of decking board made from a combination of wood fibers and plastic polymers. Unlike traditional solid composite boards, hollow decking has an interior void space running along the length of each board.
This hollow design gives the boards a lightweight yet rigid structure. The boards interlock together on your deck framing, creating a sturdy, long-lasting outdoor surface.
Hollow vs Solid Composite Decking
To decide if hollow composite decking is right for your home, it’s important to understand how it compares to solid composite boards across key factors:
Strength and Durability
Solid composite decking is inherently stronger and more rigid due to its dense construction. It can better withstand the pressure of heavy furniture, foot traffic, or even grills and hot tubs, making it ideal for high-demand settings like commercial patios.
Hollow composite decking still performs well in typical residential applications, but its internal structure means it’s more prone to denting or damage if heavy or sharp objects press down between its internal support chambers. While both types are resistant to cracking and fading, solid boards offer superior impact durability over time.
Moisture Resistance
One advantage of hollow decking is its moisture resistance. The hollow channels allow for better airflow and drainage compared to solid boards.
This design helps prevent moisture buildup that can lead to mold, mildew, and premature deterioration over time. Solid boards may be more prone to these moisture-related issues.
Weight
A major selling point of hollow decking is its lightweight nature. Hollow boards can weigh 30-50% less than solid boards of the same size.
This lighter weight makes hollow decking easier to handle and install, reducing strain on your deck framing. It’s an ideal option for second-story or raised decks.
Cost
One of the most significant differences between hollow and solid composite decking is price and overall cost.
Solid boards tend to have a higher price per unit because they use more raw material—typically 20% to 60% more expensive depending on brand and region. However, because of their greater strength, they may allow for wider joist spacing, potentially saving money on substructure materials.
Hollow boards, on the other hand, are generally more budget-friendly up front, making them a compelling choice for large-scale residential decks. However, they may require more frequent joist spacing and end caps or fascia boards to cover exposed hollow ends—adding some extra material and labor cost during installation.
Conclusion: While hollow boards are cheaper per piece, it’s important to factor in structural support and finishing materials. That said, total project cost for hollow decking is usually still lower overall in most residential applications.
Installation and Maintenance Tips
If you decide hollow composite decking is the right choice, keep these professional tips in mind:
- Use proper framing spacing: Hollow boards require framing supports spaced closer together (12-16 inches) compared to solid boards to prevent sagging.
- Allow for expansion: Leave a 1/4 inch gap between board ends and any fixed objects to allow for expansion and contraction with temperature changes.
- Gap end-to-end boards: Unlike solid boards butted together, hollow boards should have a small gap (1/8 inch) where the ends meet to allow for drainage.
- Secure board ends: Use decking clips, screws or hidden fasteners designed specifically for hollow boards to secure ends in place.
- Maintain good airflow: Don’t allow dirt, leaves or standing water to accumulate on your deck, blocking the drainage channels.
- Use care when fastening: Avoid over-tightening screws which can cause dents or cracks in the hollow board shells.
By following best practices for installation and maintenance, your hollow composite deck can provide decades of beauty and performance.
Addressing Common Concerns
Even with its benefits, some homeowners may have reservations about hollow decking such as:
“Won’t the hollow channels get filled with dirt and bugs?”
While this is a valid concern, routine cleaning can prevent any buildup inside the boards. The interlocking design also helps keep out unwanted pests and debris.
“Is hollow decking really sturdy enough for my needs?”
When installed correctly with proper framing, hollow decking meets the same structural codes and load requirements as solid boards. It can easily handle typical deck activities like entertaining and hot tubs.
“I’m worried about the hollow cores affecting traction and safety.”
The grooved surface patterns on most hollow deck boards provide excellent traction, on par with solid boards. Slipperiness shouldn’t be an issue when the deck is properly maintained.
By understanding the facts, you can feel confident addressing any misconceptions about hollow composite decking.
When to Choose Hollow Decking
So when is hollow composite decking the ideal option versus solid boards? Here are some key scenarios:
- You have a raised or second-story deck: The lightweight design reduces stress on framing.
- You live in an area prone to moisture issues: The hollow, draining design resists moisture buildup.
- You want an easier installation process: Hollow boards are lighter and easier to maneuver.
- You’re looking to save on material costs: While not dramatic, hollow boards can provide some upfront cost savings.
- You prioritize low-maintenance decking: Hollow boards provide the same durability with better moisture management.
However, if cost is the primary factor and structural load is extremely high, solid composite or even wood decking may be more suitable options to consider.
With its unique blend of lightweight strength, moisture protection, and easy installation, hollow composite decking offers an excellent decking solution for many homeowners. By understanding the pros and cons, you can decide if it’s the right fit for your outdoor living goals.
