You might want to think about replacing your worn-out wood deck with composite decking. You’ll need to start from scratch and remove every board along with its base in order to accomplish this. Is it therefore feasible to lay composite decking straight over a wood deck?

Installing composite decking boards over an existing wood deck is feasible. To achieve a good installation, though, considerable thought and planning are needed. It is crucial to remember that this strategy carries certain added hazards in addition to its benefits.

You may install composite decking over an existing wood deck by following the instructions in this article. We will also thoroughly weigh the benefits and drawbacks of doing so to make sure you understand.

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1. Considerations for Installing Composite Decking on Wood Decks

It is now clear that installing composite decking boards over an already-existing wood deck is safe. But before you start the installation procedure, there are a few things you should know.

Remember that the new composite decking you install over the existing deck will directly affect its condition. It is imperative that you conduct a comprehensive examination of the current wood decking to determine its type, age, and degree of damage. Next, determine if the current wood deck can be covered by composite decking boards.

Another significant element is the spacing between the joists. The recommended spacing for composite wood decking is 400 mm. To reduce the center distance to 400 mm, you may need to add additional planks. This is because some wooden decks are longer than others.

1.1 Rotting Wood Decking

Before the project begins, check the current condition of your wood deck. You need to make sure it is structurally sound and free of rot, decay, or other damage. You can lay composite decking directly on top of wood decking if it’s in good enough shape.

Keep in mind that a new composite deck installed over an old wood deck will be affected by the wood deck. If there is damage to the original old wood deck, then it will reduce the lifespan of the composite deck. In addition, there are a number of safety hazards that may be associated with it.

If your wood deck is beyond repair due to rot, it is unlikely that you will be able to install composite decking over it. despite the fact that composite decking is not rot-prone. It might, however, eventually rot the support structure it needs if installed on a decaying wood deck.

The new composite decking will rot considerably more if the existing deck is severely decaying because water will pool beneath it. The durability of the new decking and pedestrian safety may both be gravely threatened by this.

1.2 Various Wood Types

In addition, you ought to find out what kind of wood was used to construct your present wood deck. If you are using pressure-treated lumber for your old wood deck, then you need to have a thorough inspection. If there is damage to this wood, you need to remove and replace it promptly.

And quality lumber will last you many more years of use. Cedar, mahogany, and oak are the least prone to decay. Should a deck made of these woods be covered in composite decking. Then there is typically no impact on the new composite decking’s lifespan.

1.3 Changing the Current Wood Deck

If the old deck is damaged beyond repair, you may need to completely remove it. That is, you cannot install a new deck directly on top of an existing wood deck. Otherwise, this will create more trouble for you.

You can easily measure the amount of decay in the wood deck by inserting a screwdriver between a few planks. If there are numerous places where the wood is easily pushed in and is loose. This means that the wood is so badly rotted that you can no longer use it. The decayed wood decking may then need to be replaced entirely.

If you overlay poorly damaged wood decking with composite decking planks. The substructure of a composite deck may not last long. The lifespan of the new composite decking may be significantly shortened as a result.

1.4 Raising the Deck Height

It’s crucial to remember that adding composite decking to an already-existing wood deck will make it taller. For this reason, it can be required to modify the height of the steps, railings, and other elements. Furthermore, make sure that there is adequate ventilation and drainage to avoid moisture accumulation between the new composite decking and the old wood deck. This is due to the possibility of mold, mildew, or old deck framing deteriorating as a result of persistent moisture buildup.

Lastly, to guarantee longevity and safety, adhere to the installation instructions and suggestions provided by the composite decking manufacturer. In conclusion, thorough planning and preparation are essential for the successful installation of composite decking boards over an existing wood deck.

2. The Best Way to Install Composite Decking Over an Old Wood Deck

It’s fairly easy to lay composite decking planks over an existing wood deck. To prevent issues later, you should take the time to ensure they are installed correctly.

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Before you start, take out any outdoor furniture that may be on your wood deck. It is also necessary for you to take down the deck rails before you start.

Next, carefully and effectively install the composite decking boards on the wood deck by following the instructions below.

2.1 Step 1

To begin, remove the boards of the old wood deck using a pry bar. After that, you can create temporary blocking lines with some of these wood decking boards.

Once that’s done, make sure everything appears okay by carefully inspecting the wood deck framing for decay. Before moving forward with the installation process, you must replace or repair any severely decayed parts of the framing.

Before moving on, add further frame to support any weak or shaky areas of the original framing.

2.2 Step 2

Applying a high-quality wood preservative to any cuts in the wood deck structure is the second step. Once composite decking planks are applied, these measures will stop rot from happening.

Next, use joist protection tape to seal any screw or nail-made holes in the wood decking. This is done to stop water buildup in the holes, which can cause mold and decay. And a well-sealed board will last longer.

2.3 Step 3

To ensure that there is the proper amount of space between the ends, the composite wood decking must now be cut to the proper length. Using a 3mm drill bit, prepare the composite decking boards by drilling holes in them. By doing this, the decking boards will not break later. Next, use #8 deck screws to begin attaching the composite decking planks.

If you use matching fasteners, composite wood decking doesn’t require pre-drilling holes. The majority of composite decking suppliers offer coordinating deck fasteners. Screwing through the wood decking should only be done when it is absolutely essential. For instance, the final cut deck board, where the use of hidden fasteners is prohibited.

Working inward, begin installing composite wood decking from the outside of the structure. When laying the deck railing, the boards around the posts should be cut with a jigsaw.

2.4 Step 4

After that, trim the middle planks to the appropriate length. Move them towards the perimeter planks and away from the breaker planks to start the installation. Remember to install them facing the building from the outside of the deck.

Use shims while installing composite wood decking to ensure that the spacing between the planks is appropriate. The planks require adequate space for both cold contraction and warm expansion, thus this is crucial. Maintaining enough spacing between deck boards facilitates water drainage and averts the accumulation of dampness.

2.5 Step 5

There are just a few things left to accomplish after the old wood deck has been covered with new composite decking.

First, make sure that all of the screws, bolts, and nails are firmly in place by giving the composite decking one more inspection. Next, confirm that every composite wood decking piece is sturdy and won’t crack under the weight of large items.

Sealing composite decking is not necessary. If you want to seal composite deck boards, then you need to give them enough time to dry and seal it immediately. It is important to note that after you seal your composite deck, you will also need to do regular sealing work on it every few years.

following the completion of the aforementioned. After that, you may reinstall the deck rails and arrange your outdoor furniture on the newly installed composite decking.

3. What Pro and Cons Come with Installing Composite Decking Over an Old Wood Deck?

This method of installing new composite decking has the following benefits:

• Compared to totally dismantling the old deck and then installing new composite decking, it is simpler and takes less time.
• An excellent method to update the appearance of your outdoor area is to install new composite decking over an old wood deck.
• Low upkeep is required for composite decking. It just needs to be cleaned sometimes. It doesn’t require sealing, treating, or staining.
• Composite wood decking is more durable than wood over time. This is due to the fact that it requires fewer repairs than wood. Thus, over time, it saves you money.
• Composite decking is less prone to break during installation and is easier to lay than wood decking.
• Composite wood decking has a longer lifespan than wood since it requires less maintenance.
• Composite decking is far more environmentally friendly than wood when it comes to environmental protection. There are no new trees that need to be cut down in order to create it because it is made from recycled plastic and wood fibers.
• There is a large selection of colors and finishes for composite decking planks. Therefore, coloring it doesn’t require spending money or time.

Likewise, there may be several disadvantages to replacing an old wood deck with modern composite decking:

• You run the risk of damaging the new composite decking if you neglect to inspect the old wood decking and its supports for decay.
• Installing composite decking is more costly than wood decking. However, you’ll eventually save enough money on maintenance to make up for it.
• You will need to clean your composite decking boards more frequently than a wood deck. This is due to the fact that materials like water and dirt may lodge between the two decks.

4. In Summary

It is simple and advantageous to lay composite decking planks over an existing wood deck. It takes less time than reconstructing your entire outdoor deck and is a simple method to give your outdoor space a fresh look.

Remember that you will need to look for symptoms of rot in the old wood deck’s framing system before you start. Make sure that the condition of your old wood deck will allow you to use your new deck for a longer period of time. This can reduce the amount of times you have to maintain your deck on a regular basis.

5. Commonly Asked Questions

5.1 Is the Material for Composite Decking Denser Than Wood?

Because composite material is composed of a blend of plastic polymers and wood fibers, it is heavier than wood. Composite decking boards typically weigh around 25% more than wood decking.

5.2 Is It Better to Fasten Composite Decking Using Screws or Nails?

Installing composite decking boards with screws is not even a smart idea. This is done to keep composite decking from twisting or bending due to expansion and contraction. It is advised that you use fasteners that match. Prior to screwing in composite decking boards, make sure the holes are pre-drilled. This will offer you a good deck surface by assisting the deck’s expansion and contraction.

5.3 Is a Specific Saw Blade Needed to Cut Composite Decking?

To cut composite decking boards like wood, just use a flexible, sharp saw blade. A standard jigsaw can be used to cut composite decking material. However, it is important to follow the directions to determine which blade to use. We believe that an aluminum blade with several uses is the ideal blade to utilize.

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