Can You Reuse Your Deck Frame with Angelim Decking?

Understanding Angelim Decking Characteristics

Angelim (Hymenolobium spp.), also known as Angelim Pedra, is a Brazilian hardwood prized for its robustness. Its heartwood typically displays a yellowish beige hue that darkens to a pinkish brown over time. It is a very durable material, naturally resistant to insects, rot, and fungi, which contributes to its long lifespan.

With an air dry density of 5.58 lbs/bf and a specific gravity of 0.79, Angelim is a substantial material. This density provides stability and strength, making it suitable for decking. However, this also means that the supporting structure must be capable of bearing its weight, especially over the long term and when wet.

While Angelim is described as easy to install, pre-drilling is recommended for fasteners due to its density. Its absorptive nature also makes it receptive to stains and oils for finishing, allowing for customization of its appearance.

Assessing Your Existing Deck Frame: Key Considerations

Before considering Angelim decking for a resurfacing project, a comprehensive assessment of your existing deck frame is crucial. The frame is the foundation that supports the entire deck, and any weaknesses can compromise the safety and performance of your new decking.

Start by inspecting all structural components, including posts, beams, and joists. Look for any signs of rot, decay, insect damage, or significant warping. Pay close attention to areas where wood meets the ground or is consistently exposed to moisture, as these are common points of deterioration.

Check the connections between components. Loose fasteners, corroded metal connectors, or splitting wood around attachment points can indicate structural weakness. Ensure all posts are securely anchored and that beams are adequately supported.

Joist Spacing and Span Requirements for Angelim Decking

Hardwood decking, including Angelim, typically requires specific joist spacing to prevent deflection, movement, and ensure proper support.

While general guidelines exist, the exact maximum joist spacing for Angelim decking depends on the board thickness and width, as well as the anticipated load. Wider spacing may not provide adequate support, leading to bouncy sections or premature wear.

If your existing frame has joists spaced wider than recommended for Angelim decking, you may need to add additional joists or install blocking to reduce the effective span. This modification can add complexity and cost to the project but is essential for a safe and stable deck.

Structural Integrity and Load Bearing Capacity

Angelim decking is denser and heavier than many other decking materials, such as some composites or treated pine. This increased weight translates to a higher dead load on your deck frame. Therefore, the frame must be robust enough to support not only the new decking but also live loads like people, furniture, and snow.

Consider the original design specifications of your deck. Was it built to current code standards? Has its original purpose changed (e.g., adding a hot tub)?

A qualified professional can assess the load-bearing capacity of your existing frame and recommend any necessary upgrades, such as strengthening beams, adding posts, or improving foundations. This step is vital to prevent structural failure.

Worked Example: Assessing a 10x12-foot Deck Frame

Let's consider a hypothetical 10-foot by 12-foot deck frame. The homeowner wants to replace the cedar with 1x6 Angelim decking.

First, inspect the existing frame. Assume the posts, beams, and joists show no signs of rot or insect damage, and all connections are sound. The frame appears structurally intact for its original purpose.

For 1x6 Angelim decking, a typical recommendation is 16 inches on center, and sometimes 12 inches on center for optimal performance. Reusing this frame as-is would likely result in excessive deflection and potential issues with the new Angelim boards.

This requires careful measurement, cutting, and securing of new joists, along with ensuring proper ledger board and beam connections. This modification significantly increases the project scope but ensures the new Angelim decking is properly supported.

This example highlights that while the main structural elements might seem sound, the joist spacing is often the primary limiting factor for resurfacing with denser materials like Angelim.

Additional Factors for Frame Reuse

Beyond structural integrity and joist spacing, consider the deck's overall levelness and squareness. An uneven or twisted frame will transfer these imperfections to your new Angelim decking, making installation difficult and potentially leading to an unsatisfactory finished appearance.

Ensure adequate ventilation beneath the deck. Good airflow helps prevent moisture buildup, which can contribute to rot in the frame and impact the stability of the new decking. If the current frame has poor ventilation, consider adding lattice or other means to improve air circulation.

Finally, review local building codes. Codes can change over time, and what was compliant when your deck was built may not meet current standards, especially for new materials or increased loads. A permit may be required for resurfacing, particularly if structural modifications are made.

Before you order

• Inspect posts, beams, and joists for rot, decay, or insect damage.
• Check all structural connections for security and corrosion.
• Assess the frame's overall load-bearing capacity for the heavier Angelim decking.
• Confirm the frame is level and square.
• Evaluate under-deck ventilation.
• Consult local building codes for resurfacing requirements and permits.
• Obtain a professional assessment from a qualified installer or engineer.

Confirm installation details, approved uses and warranty terms in the current instructions for the exact product and profile. Your installer should verify the substrate, structure and applicable project requirements.

Questions to help you decide

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