Choosing Fiberon Decking for a Renovation: What to Check First

Understanding Fiberon Decking Requirements

Fiberon composite decking is a capped wood-plastic composite material designed for durability and low maintenance. It is manufactured with a specific profile and requires certain conditions for proper installation and long-term performance. Understanding these requirements is the first step in assessing your existing deck frame.

Fiberon boards are typically 1 inch by 5.5 inches in profile and are available in various lengths, including 12, 16, and 20 feet. They can be installed using hidden clips with grooved-edge boards or face screws with square-edge boards. These specifications are critical for ensuring adequate support and preventing issues like board deflection or warping over time.

Fiberon offers different lines such as Concordia, Sanctuary, and Good Life, each with varying capping levels and warranty durations, but the fundamental structural requirements for the substructure remain consistent across the product family. All lines are designed for a no-stain, no-seal ownership experience, making them an attractive option for renovators seeking to reduce future maintenance.

Assessing Your Existing Deck Frame for Structural Integrity

The integrity of your existing deck frame is paramount. Before even considering new decking, thoroughly inspect all structural components: ledger board, joists, beams, posts, and footings. Look for any signs of rot, insect damage, cracks, or excessive movement.

Pay close attention to the ledger board where the deck attaches to your house. This is a common point of failure if not properly flashed and secured. Check for loose connections or water damage behind the ledger. Inspect joists and beams for sagging, twisting, or splitting. Any compromised structural member should be repaired or replaced before new decking is installed. Posts should be plumb and securely anchored to footings, which in turn should be stable and free from erosion or settlement.

If you discover widespread structural issues, a full frame replacement might be more cost-effective and safer than attempting repairs. Consult with a qualified contractor or structural engineer if you have any doubts about the frame's integrity.

Checking Joist Spacing and Alignment

Measure the current joist spacing across your entire deck. If your existing joists are spaced wider than these recommendations, you will need to add additional joists or sister new joists alongside existing ones to meet the requirements. This is a critical step to prevent the composite boards from feeling spongy, sagging, or potentially failing prematurely. Also, ensure that the tops of the joists are level and in good condition, free from rot or significant unevenness, as this will directly affect the finished appearance of your new deck surface.

Ventilation and Drainage Considerations

Proper ventilation and drainage are essential for the longevity of both your deck frame and the new Fiberon decking. While composite decking itself is highly resistant to moisture, the underlying wood frame still needs protection. Ensure there is adequate airflow beneath the deck to prevent moisture buildup, which can lead to rot and mildew on the substructure.

Check for any areas where water might pool on or around the frame. Clear away debris, ensure proper grading away from the house, and verify that gutters and downspouts are directing water away from the deck area. If your deck is low to the ground, consider installing lattice or skirting that allows for sufficient air circulation without trapping moisture. Good ventilation helps to keep the wood frame dry and stable, contributing to the overall durability of your renovated deck.

Worked Example: Renovating a 10x12 Foot Deck

Let's consider a hypothetical 10-foot by 12-foot existing deck frame.

First, you inspect the frame: all joists, beams, and posts appear sound with no visible rot or damage. Next, you measure the joist spacing. According to Fiberon's specifications, this is too wide for perpendicular installation (which requires 16 inches o.c. max).

To meet the requirement, you will need to add intermediate joists. This modification ensures the Fiberon decking will be adequately supported and perform as intended.

Additionally, you confirm the joist tops are level and clear of debris. You also check the area beneath the deck, ensuring adequate ventilation and drainage. Based on this assessment, the renovation would involve reinforcing the joist system before installing the new Fiberon Concordia boards.

Before you order

• Is the existing deck frame structurally sound (no rot, cracks, or excessive movement)?
• Are the ledger board connections secure and properly flashed?
• Are joist tops level and free from damage?
• Is there adequate ventilation beneath the deck?
• Is the area around the deck graded for proper water drainage?
• Are there any local building codes or permit requirements for deck renovations in your area?
• Have you considered the total cost of frame modifications versus a full frame replacement?

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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