Your wooden deck has seen better days. The boards are weathered, and maintenance is getting old fast. If you’re thinking about switching to composite decking, you might wonder if you can install it right over your existing wooden deck.
The short answer is yes, but it’s not as simple as putting new boards on top. There are important steps to follow to make sure the new deck is safe, durable, and up to code. Skipping those steps could lead to structural issues down the line.
This guide will walk you through what re-skinning a deck means, how to check your current structure, and what to do to ensure your composite decking installation goes smoothly.
Understanding Re-Skinning: Installing Composite Decking Over Wood
Re-skinning refers to the process of installing new decking material over an existing deck structure. When considering laying composite decking over an existing wooden deck, several critical factors must be evaluated:
Structural Integrity of the Existing Deck
Before adding any new material, it’s imperative to assess the current deck’s substructure:
- Joist Spacing: Composite decking typically requires joist spacing of 16 inches on center. However, to ensure a more stable and true deck surface, we recommend spacing joists 12 inches on center.
- Compliance with Building Codes: Altering more than 50% of a deck’s structure usually necessitates obtaining a permit. Building codes, which are updated every three years, may have changed since your deck was originally built. This means that aspects like footings, post spacing, beam sizes, and attachment methods might not meet current standards.
Potential Issues with the Existing Structure
Several risks are associated with re-skinning an old deck:
- Unknown Lifespan of the Substructure: While composite boards come with warranties ranging from 25 to 50 years, the existing wooden substructure may have an uncertain lifespan. If the underlying structure fails prematurely, it could compromise the new decking and any railing systems installed.
- Hidden Defects: Pressure-treated lumber can develop defects and rot within 8 to 10 years. Without proper inspection, underlying issues might go unnoticed, leading to future structural problems.
Steps to Safely Install Composite Decking Over an Existing Wooden Deck
If, after a thorough inspection, you decide to proceed with re-skinning, follow these steps to ensure a successful installation:
- Remove Existing Deck Boards: Carefully detach the old wooden decking to expose the substructure. This allows for a thorough inspection and necessary repairs.
- Inspect and Reinforce the Substructure: Check for signs of rot, decay, or structural weaknesses. Ensure that joist spacing meets the recommended 12 inches on center for composite decking. Reinforce or replace any compromised components.
- Apply Protective Measures: Use joist protection tape to cover any holes or exposed areas in the substructure. This prevents water accumulation and potential rot.
- Install Composite Decking: Cut the composite boards to the appropriate length, allowing for proper spacing to accommodate thermal expansion. Use recommended fasteners to secure the boards, starting from the outer edge and working inward.
- Final Inspection: Once installation is complete, verify that all fasteners are secure and that the deck surface is stable and free from defects.
Advantages and Disadvantages of Re-Skinning with Composite Decking
Advantages:
- Cost-Effective: Re-skinning is generally more affordable than a complete deck rebuild.
- Enhanced Aesthetics: Composite decking offers a modern, clean look with various color and finish options.
- Low Maintenance: Unlike wood, composite materials resist rot, insects, and do not require regular staining or sealing.
Disadvantages:
- Structural Uncertainty: The existing substructure may have an unknown lifespan, potentially leading to future issues.
- Increased Weight: Composite materials are heavier than wood, which could strain an older substructure.
- Potential Trapped Moisture: Installing new decking over old wood can trap moisture, leading to rot in the substructure.
In Summary
While it is possible to lay composite decking over an existing wooden deck, it’s crucial to thoroughly assess and prepare the substructure to ensure a safe and durable outcome. At DW Decks, we specialize in evaluating existing deck conditions and providing expert installation of composite decking. Our team ensures that all projects comply with current building codes and standards, delivering a beautiful and long-lasting outdoor space. For personalized advice and professional assistance with your decking needs, contact us today.
