Composite Decking Replacement Made Easy: Replacing Your Old Wood Decking

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Wood decking demands consistent upkeep to maintain its appearance and durability. Homeowners who underestimate the required maintenance can quickly find their deck deteriorating into a rotted, splintered mess. But before you decide to tear it down entirely, consider upgrading to a low-maintenance alternative.

Engineered materials like composite and PVC decking offer the natural look of wood without the constant upkeep. Even better — replacing your old wood boards with composite decking is simpler than you might expect. In this guide, we’ll walk you through everything you need to know about the resurfacing process and how to replace your existing deck boards with composite materials.

 

When to Replace Your Wood Deck

If your deck boards are showing signs of rot, splintering, or decay, it’s more than just an eyesore — it’s a safety hazard. Don’t wait until minor damage turns into a major problem. Replacing your worn-out wood boards with high-quality composite decking is a smart investment that instantly improves your deck’s appearance, safety, and longevity. With composite materials, you’ll enjoy the beauty of wood without the constant maintenance — so you can spend more time relaxing and less time repairing. 

 

Cost of Replacing Wooden Deck Boards

In many cases, new composite deck boards can be installed right over your existing substructure — including the posts, joists, and beams that support your deck. This efficient approach can dramatically reduce both time and cost during your upgrade.

While composite decking may have a higher upfront price than traditional wood, it quickly pays for itself through minimal maintenance, lasting durability, and timeless beauty. With composite materials, you’re not just replacing your deck — you’re investing in years of worry-free outdoor living.

 

Where Composite Re-decking Gets Complicated

One of the main challenges of resurfacing a wood deck with composite boards is the difference in joist spacing. Many older decks were built with joists spaced 16 inches on center, while most composite decking manufacturers recommend spacing of 12 inches on center. This tighter spacing provides better support since composite boards are slightly more flexible than wood.

Although composite boards are strong and won’t break underfoot, a 16-inch gap can create a noticeable bounce when walked on — something many homeowners find unsatisfactory. Based on our experience, we don’t recommend installing composite decking over a substructure with 16-inch joist spacing, as it can affect both comfort and long-term satisfaction with your new deck.

 Solution #1

If you prefer to keep your existing joist layout, consider using a composite decking board rated for larger spans, such as Eva-Last® Apex Plus or Eva-Last® Pioneer. These premium boards can span up to 24 inches thanks to their Glass Fiber Reinforced Solid Profile, which provides exceptional strength and stability.

However, even though these products are designed to handle wider joist spacing, we still recommend sticking to the standard 12 -inch or 16-inch spacing for the most solid, comfortable, and bounce-free deck experience.

 

Solution #2

If your deck’s framing is still in good condition and only needs minor repairs, you can easily reinforce it by adding extra joists between the existing ones. This simple upgrade tightens your joist spacing to about 8 inches on center, providing the additional support needed for any brand of composite or PVC decking. It’s a cost-effective way to strengthen your deck’s structure and ensure a sturdy, long-lasting surface for your new boards.


Tips- After leveling and correcting your joist spacing, take your deck upgrade one step further with a waterproof joist coating. Applying a premium product like FastenMaster Deck Frame Coating protects your substructure from trapped moisture and rot — helping your deck last for years longer. It’s a small investment that makes a big difference, ensuring your new composite decking stays strong, stable, and beautiful from the frame up.

Assess Your Deck’s Health

Start by giving your deck a thorough inspection — both the surface and the substructure. Look closely for these common signs of trouble:

  • A loose ledger board (the component that attaches your deck to your home)


     

  • Mildew, mold, or rot on boards or framing


    Tip - If there is a small amount of surface mold that hasn't started to root deep into the board we suggest cleaning with Wash Safe Wood Wash.

     

  • Rusted, loose, or protruding fastener


     

When to Repair

Not every issue means your deck needs replacing. Some minor problems can be easily fixed:

  • A small gap between the ledger board and your home is often caused by trapped debris. Clear it out and tighten the fasteners.

  • Localized rot, mold, or mildew can usually be treated or repaired. A deck professional can help you determine whether a cleaner or a board replacement is best.

  • Rusted or loose fasteners are common — simply replace corroded ones, tighten loose screws, or tap protruding nails back into place.

Most of these repairs can be handled with basic DIY skills. However, if you’re unsure or want professional peace of mind, it’s always wise to call a deck specialist.

When to Replace

If your ledger board is pulling away from the house or shows signs of rot, replacement is necessary. Rot in the substructure severely compromises your deck’s stability and safety.

Similarly, if you discover widespread rot, insect damage, or a large number of rusted or loose fasteners, it’s likely a sign of structural decay. In these cases, a full deck replacement is the safest and most cost-effective solution in the long run.

 

Consider Your Deck’s Longevity

How much longer do you plan to enjoy your current deck? How many more years do you expect it to last before you’ll need a full replacement?

Tip - Most traditional wood decks only last around 10 to 15 years. Since wood doesn’t hold up well against moisture and weather exposure, it gradually wears down. Sooner or later, a full replacement will be necessary. 

Answering these questions will help you decide whether it’s more practical to invest in repairs or go for a complete replacement.

If you plan to move within the next few years, repairing your deck might be the smarter choice—unless there are structural issues. Ignoring structural damage could hurt your home’s resale value later.

However, if you intend to stay put, a full deck replacement could be the perfect home improvement project. Upgrading to higher-quality materials, such as composite decking, can enhance durability, reduce maintenance, and increase your outdoor living enjoyment for years to come.

Evaluate Repair vs. Replacement Costs

Next, compare the costs of repairing versus replacing your deck. Once you’ve assessed its condition and your long-term plans, you’ll have a clearer picture of which option offers better value.

Keep in mind that accurate cost estimates require professional input. Contact a reputable deck repair contractor to get a detailed quote and expert advice tailored to your specific situation.

 

Where to Find Decking Materials for Your Resurfacing Project


 

Transform your old deck into a stunning outdoor space with the right materials and support. At Chamberlain Timber Mart, we make it easy to bring your resurfacing project to life with top-quality decking materials, tools, and hardware trusted by professionals and DIYers alike.

As the leading supplier of marine and decking materials across Muskoka and Central Ontario, we’re proud to be your one-stop shop for everything you need to get the job done right. Visit us in Gravenhurst Ontario or give us a call today. If you ever need expert advice, our friendly team is always here to help you every step of the way.

 

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