Can You Put Composite Decking over an Old Deck?
Out of all the decking materials available, composite deck boards stand out as a good choice because they look attractive and last a long time. If your deck is made of wood and looks old, you might want to replace it with composite decking boards. A lot of people wonder, “Can I put composite decking over an old deck?” Yes, that’s correct. You can install composite decking on top of existing wooden decking.
Of course, the best thing to do is to take off the old deck boards and put down new composite boards on top of the frame that is already there. This method keeps water from building up and keeps the wood below from rotting. However, if the old boards are in good shape, you can put the new boards right on top of them after checking the framework.
This piece talks about whether or not it is possible to put composite decking over an old deck. This could help you make a beautiful and long-lasting outdoor living space.
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Table of Contents
What Should be Considered when Putting Composite Decking over an Old Deck?
Before picking up your tools, thoroughly inspect and assess the old decking. This helps avoid costly repairs or even rework down the road.
Understand The Characteristics of The Old Decking and Composite Decking
First, you need to know what materials the old deck uses. Woods like redwood, cedar, and pressure-treated lumber resist decay. Their framing may have a longer remaining lifespan. Materials like common pine require more careful inspection.
Also, know what the composite deck boards you’re going to use are made of. Good composite deck materials don’t rot, attract bugs, or crack or warp. Manufacturers like EVODEK also offer capped composite decking with enhanced protective properties. Their surfaces have an extra layer of protection that makes them more resistant to fading and mildew.
Assessing The Condition of The Existing Deck
Check out the state of your current deck before you start building. Pay attention to checking the structure for rot, damage, or other problems. The state of the old deck has a direct effect on how long the composite decking lasts. Putting composite decking over an old deck that is too rotten to fix is not a good idea.
The most direct method to determine wood rot is the screwdriver test. Take a sharp screwdriver and poke it into different areas of the deck. If the screwdriver easily penetrates deep into the wood, it indicates internal decay.
Inspect Deck Drainage and Ventilation
Both wooden decks and composite decks require proper drainage and ventilation. Ensure your deck drainage is unobstructed. This determines whether moisture will pool after installing composite wood decking. Composite decking doesn’t rot, but if water pools on it for a long time, the wooden deck and support structure below can rot over time. This shortens the life of your new deck by a lot and makes it less safe for people to walk on.
Check Height, Joist Spacing, etc.
Installing composite decking over an existing deck will elevate the deck height. This involves structural and height considerations. You may need to adjust doorways, railings, stairs, and other features. Additionally, don’t forget to check joist spacing. Most composite wood decking requires a maximum center-to-center spacing of 16 inches.
Measure the center distance of your existing deck joists with a tape measure. If the gaps are too big, you need to add more joists before putting down the composite deck boards. This will keep the boards from sagging when they’re loaded. If you are worried about the strength of a structure, you should talk to a structural expert.
Understanding Deck Warranty Terms
Before buying composite decking, make sure you read the warranty and fitting instructions. Some manufacturers impose strict requirements on deck installation methods. Failure to install according to specifications may void the warranty. Therefore, ensure your construction plan complies with these requirements before beginning work.
How to Install Composite Decking on an Existing Deck?
Installing composite decking on an old deck is straightforward. After conducting a thorough inspection and assessment, proceed with installation following these steps.
Remove and Clear Items from the Deck
Before laying composite decking, you must remove all furniture, planters, and decorative items. Additionally, dismantle the deck railings prior to construction. Next, systematically remove all old wooden boards. If needed, you can use these old boards as temporary fencing. During removal, carefully inspect the old deck framing for rot. If present, perform repairs or replacements first.
Clean and Repair Old Deck Framing
Once the boards are off, use a stiff brush to clean the frame of all the trash and decaying matter. Simultaneously, conduct a thorough inspection of the framing. Perform screwdriver tests and visual checks on every joist, beam, and post. For damaged joists, remove them entirely. You can replace them with composite joists treated for decay and insect resistance.
Next, cover all screw or nail holes in the boards with joist protection tape. This prevents water accumulation in the holes, avoiding rot and mold. Finally, tighten all loose bolts and metal fasteners.
Selecting Composite Deck Fastening Methods
Generally, hidden fasteners are the preferred choice for modern composite deck installations. This method makes sure that you can’t see any screws on the surface, giving you a nice finish. If using screws, you must pre-drill holes in the composite deck. Directly driving screws into the deck may cause cracking. Always use rust-resistant deck screws specifically designed for composite wood decking.
Cutting and Laying
Next, cut the composite decking to the desired length and begin laying it. Start from the outer edge of the deck and work inward. During installation, use spacers to ensure adequate gaps between boards.
This is very important because composite deck boards need room to expand and shrink with the temperature. Proper gaps also facilitate water drainage, preventing moisture buildup. For obstacles like railing posts or pipes, use a jigsaw or circular saw for precise cuts.
Finishing Touches and Inspection
After installation, inspect every corner of the deck. Pay close attention to loose boards or protruding fasteners. Then, use a soft-bristle brush and soapy water to clean the deck’s surface and get rid of any dust or stains from the process. Finally, don’t forget to install the railings and stairs. Mount the pre-prepared new railing system onto the reinforced framework. Rebuild or adjust the stairs according to the new height.
What are The Benefits and Risks of Putting Composite Decking over an Old Deck?
When you put composite decking over an old deck instead of making a new one, you get the following benefits:
- Aesthetics and Durability: Composite decking features a wide range of color and texture options. It resists fading, scratches, mildew, and rot, with a lifespan exceeding 25 years.
- Cost Savings: This method saves money because it doesn’t require tearing down old framing, getting rid of construction waste, and building new supports.
- Time Efficiency: You can use your outdoor space again faster because the building takes a lot less time.
- Environmental Benefits: This method repurposes existing structural frameworks, minimizing construction waste. Additionally, composite decking is made from recycled plastic and wood fibers. It is also an eco-friendly option.
- Low Maintenance: This is the core advantage of composite deck materials. No regular sanding, painting, or sealing is required after installation. Occasional sweeping and washing suffice to maintain a like-new appearance year-round.
Of course, installing composite decking over old decking also presents some drawbacks and risks. For example:
- Demands on the Old Frame: The lifespan of the new decking is directly tied to that of the underlying old frame. If the framing deteriorates within a few years, repairs become extremely difficult.
- Potential Warranty Risks: Improper installation may void warranties.
- Prone to Dust Accumulation: When you put composite decking right on top of old deck boards, dust and water can get stuck between the layers. It means you’ll have to clean it more often.
Conclusion
Installing composite deck material over an old deck is a viable renovation project. It significantly reduces deck remodeling costs while creating a fresh outdoor space appearance. Before starting, thoroughly inspect the old structure. Seek professional assistance if necessary. For further questions about composite decking, contact us. EVODEK provides detailed answers.
FAQ
Is Composite Decking Heavier Than Wood Decking?
Yes, on average, composite decking weighs about 25% more than pressure-treated wood of the same size. This is due to its higher density, which includes plastic polymers and wood fibers in its composition.
Can I Use a Pressure Washer to Clean Composite Decking?
Yes, but extreme caution is required. Always use a fan tip and keep enough space between the deck surface and the nozzle. Generally, mild detergents and soft-bristle brushes are safer options. They can easily remove most dust and stains.
What Should I Do If Composite Decking Gets Scratched During Installation?
Minor scratches typically do not affect structural integrity. Composite decking has a consistent color throughout, so minor scratches may be less noticeable. You can also treat minor scratches using the manufacturer’s recommended methods. For more severe scratches, replacing the individual board is recommended.
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