Top 5 Decking Subframe Materials and Their Benefits

When building a deck, many homeowners focus primarily on the choice of decking boards and overlook the importance of the subframe material. However, the subframe is crucial to your deck’s stability, longevity, and overall performance. In this blog, we’ll take a closer look at the most popular decking subframe materials to help you decide on your deck renovation.

What Is a Decking Subframe?

In simple terms, a decking subframe is a hidden framework that supports your deck’s surface. It acts as the foundation upon which your deck is built. Think of it as the skeleton that gives structure to the entire deck. When choosing the right subframe material, consider the requirements and benefits of frames for composite decking.

The Role of a Decking Subframe

A decking subframe serves several crucial functions:

• Support: The subframe bears the weight of the decking boards and any additional loads, such as furniture and people. It needs to be strong and reliable to prevent sagging or structural issues.
• Drainage: Proper subframe design allows for efficient water drainage, preventing water from pooling on the deck’s surface and potentially causing damage.
• Ventilation: Good subframe design promotes ventilation, reducing the risk of moisture-related problems like rot and decay.

Top 5 Decking Subframe Materials

Wood Subframes

Wood was the material of choice for decking subframes for a long time. Here are a few of its main advantages:

Natural Aesthetic: Wood subframes blend seamlessly with wooden decking, creating a cohesive and timeless look.

Cost-Effectiveness: Wood is frequently less expensive than other materials, making it an appealing option for cost-conscious homeowners.

Ease of Installation: Wood subframes are relatively easy to work with, making installation straightforward for DIY enthusiasts.

Wood subframes may need staining, sealing, and regular protection from rot and pests regularly, so it’s important to consider these things when planning their installation.

Steel Subframes

Steel subframes are gaining popularity due to their remarkable strength and durability. Here are some benefits:

Exceptional Strength and Durability: Steel can withstand heavy loads, ensuring your deck remains stable and safe.

Resistance to Rot, Pests, and Moisture: Unlike wood, steel won’t rot, attract pests, or suffer from moisture damage.

Long Lifespan: Steel subframes can last for decades, reducing the need for frequent replacements.

Nevertheless, steel subframes are often more costly and can necessitate the assistance of a professional installer because of their intricacy. Rust is also a potential concern, so proper coatings are necessary.

Aluminium Subframes

Aluminium subframes offer a balance of strength and lightweight properties. Their benefits include:

Lightweight yet Strong: Aluminium is remarkably strong for its weight, making it easy to handle during installation.

Resistance to Corrosion: Aluminium is naturally resistant to corrosion and doesn’t require additional treatments.

Low Maintenance: Minimal maintenance is needed to keep aluminium subframes in good condition.

However, aluminium subframes can be more expensive than some alternatives, and the variety of available finishes may be limited. Additionally, aluminium’s high thermal conductivity could make the deck surface hot in direct sunlight.

Composite Subframes

Composite subframes are known for their durability and resistance to environmental factors. Key benefits include:

High Durability: Composite materials are exceptionally durable, resisting rot, insects, and moisture.

Low Maintenance: Minimal maintenance is required without staining or sealing.

Longevity: Composite subframes can last for decades without significant degradation.

On the downside, composite subframes often come with a higher initial cost and colour options may be limited. Additionally, they can expand and contract with temperature fluctuations, requiring proper spacing during installation.

Plastic (PVC) Subframes

Plastic (PVC) subframes are a low-maintenance option with these advantages:

Excellent Resistance to Moisture and Insects: PVC subframes are impervious to moisture and insect damage.

Low Maintenance: Little maintenance is needed to keep them in good condition.

Long Lifespan: PVC subframes can last long, even in harsh conditions.

However, they may have limited structural strength and colour options. Some individuals also have environmental concerns regarding PVC materials.

Choosing the Right Decking Subframe Material for Your Project

Selecting the ideal subframe material involves carefully evaluating your project’s unique requirements. Here are some steps to help you make an informed decision:

Step 1: Assess Your Environment

Consider the climate, weather conditions, and local environment where your deck will be situated. For instance, moisture resistance should be a priority if you live in a rainy region.

Step 2: Determine Your Budget

Evaluate your budget for the entire decking project, including surface materials and the subframe. Remember that investing more in a durable subframe can pay off in the long run.

Step 3: Match with Decking Material

Your choice of decking material should complement the subframe. Different subframe materials work best with specific decking materials. Compatibility is crucial in achieving a stable and long-lasting deck.

Step 4: Consider Sustainability

If environmental concerns are significant, explore eco-friendly subframe options like recycled plastic or sustainably sourced wood.

Step 5: Seek Professional Guidance

Consult a professional deck builder or contractor for specific recommendations based on your requirements and local conditions. Their experience can be invaluable in making the right decision.

Installation and Maintenance Tips

Installing and correctly maintaining your decking subframe is crucial for your deck’s long-term performance and safety. Here are some essential tips to keep in mind:

Installation Guidelines

1. Proper Spacing: Ensure adequate spacing between joists to support the requirements of your chosen decking material. Consult manufacturer guidelines for specific spacing recommendations.
2. Level and Square: Take the time to ensure your subframe is level and square. A well-constructed subframe provides a stable base for your deck, preventing issues like uneven surfaces or structural problems.
3. Use Quality Fasteners: Invest in high-quality, corrosion-resistant fasteners to secure your subframe elements. These will withstand the elements and provide lasting stability.

Maintenance Practices

1. Regular Inspection: Periodically inspect your subframe for signs of wear, damage, or rot. Early detection and maintenance can prevent more significant issues down the road.
2. Clean and Treat: If using wood subframes, clean and treat them regularly to protect against rot and decay. Composite or metal subframes may require less maintenance but should still be checked for any signs of corrosion or damage.
3. Address Drainage: Check that your subframe has adequate drainage to prevent water from gathering and causing structural difficulties or decking material damage.

Conclusion

Choosing the right subframe material for your deck is a decision that should be taken with seriousness. Each material has advantages and disadvantages, so weighing them against your specific needs, budget, and design preferences is crucial. Remember that a well-constructed subframe is the foundation of a sturdy and long-lasting deck, ensuring you can enjoy your outdoor space for years.