How to Install Composite Decking over Concrete?
High-quality and cheapest composite decking is ideal for many homes because of its beauty, durability, and ease of maintenance. Also, concrete is one of the most commonly used materials for outdoor spaces. Many homeowners will install composite decking over concrete. This not only makes the most of the existing space, but also adds a comfortable relaxation area to the home.
However, installing a composite deck over concrete is no easy task. You need to consider a number of aspects, including the stability of the concrete structure, how the deck is installed, drainage issues, and safety features. This article will detail how to install a composite deck over concrete. You can create an outdoor living space on concrete that is both beautiful and functional.
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Table of Contents
What are The Advantages of Installing Composite Decking over Concrete?
Before you start the installation, you may want to ask the question: Is it a good idea to install a composite deck over concrete? It is! We couldn’t agree more that you should install a composite deck over concrete. There are several advantages to installing a composite deck over a concrete deck compared to a sand or soil foundation:
- Easy and Convenient Installation: Concrete surfaces are solid, durable, dry, and flat. Installing a composite deck over concrete can result in significant savings in installation time and cost.
- Makes Composite Decks More Durable: Concrete bases are drier than soil. This keeps composite decking and joists from being easily damaged by moisture and standing water. As a result, the lifespan will be longer.
- Aesthetically Pleasing and Easy to Clean: Concrete does not grow weeds and plants. By installing composite decking over concrete, you won’t need to regularly inspect and clean up weeds that grow on your deck.
Factors to Consider Before Installing Composite Decking over Concrete
Before embarking on the installation of composite decking over concrete, we need to consider the following key factors:
Stability of The Concrete Structure
The stability of concrete as the foundation of the deck is critical. A widespread problem is that concrete decks can settle. If you install a composite deck during a period of concrete settlement, the deck may move and deform over time. For this reason, we need to inspect the concrete for cracks, settlement, or other structural issues. The most important thing is to make sure it can withstand the weight of the deck and the loads that come with daily use.
Check Whether The Concrete Plane is Level
Use a level and a tape measure to measure the flatness of the concrete surface. Any unevenness needs to be repaired using a self-leveling composite or an adjustable base. In short, make sure that the patched surface is flat and smooth before starting the installation.
Installation Method
Choosing the right installation method is crucial for both the solidity and aesthetics of the composite deck. We need to choose the most suitable installation method according to the actual condition of the concrete structure and the material of the deck. You can also seek professional installation guidance from composite decking brand owners such as EVODEK.
Drainage Problems
Good drainage performance is the key to the long-term use of the deck. We need to make sure that the deck surface is properly sloped so that rainwater can drain out smoothly. This can avoid damage to the deck caused by stagnant water.
Effect of Deck Height Increase on Doors
When installing a composite deck over existing concrete, the deck height will rise. You will want to keep this in mind during installation. Make sure that the deck does not interfere with the opening and closing of the door. Of course, you can also take this opportunity to do a creative remodelling of the door and steps or other amenities.
Budget
Finally, don’t forget to calculate how much you need to spend. The amount of money you spend on composite decking depends largely on the size of the deck and the cost of installation. Typically, installing a composite deck over concrete costs about $30-$50 per square foot. The exact price depends on the brand of composite decking chosen, the specific site circumstances, and design style. Of course, if you choose to do a DIY installation, the overall cost will be cut in half or more.
Steps to Install Composite Decking over Concrete
Generally speaking, installing composite decking over concrete requires the following steps:
Tools and Materials Preparation
Before we start the installation, we need to prepare a series of necessary tools and materials to ensure the smooth progress of the construction. Including:
- Tools: Cordless drills, hammer drills, straightedge, circular saws, chalk line spools, screwdrivers, levels, tape measures, etc.
- Safety and Protective Items: Helmet, protective glasses, gloves, mask, etc.
- Materials: Composite deck boards, keel frames, plastic washers, concrete screws, waterproof tape, self-leveling composite materials, etc.
Layout and Measurement
Before we start the installation, we need to make an accurate layout and measurement of the deck. You can use a tape measure to measure the dimensions of the concrete structure to determine the number of deck boards needed. When measuring, the gaps between the deck boards and the trim boards around the edges need to be taken into account.
Based on the measurements and the dimensions of the deck boards, develop a detailed layout plan. Use a chalk line spool to mark the location of the keel frame and the arrangement of the deck boards on the concrete surface. You can also look for a professional to design it. Ensure that the layout is reasonable, aesthetically pleasing, and meets the practical needs of use.
Installation of Keel Frame
The keel frame is the basic structure of the deck. According to the layout plan, cut the keel frame to the required length. When cutting, take care to use a circular saw or sawzall and ensure that the cut edges are flat and smooth.
Place the cut keel frame on the concrete surface and arrange it according to the layout plan. Secure the keel frame to the concrete using concrete screws. When securing, pre-drill holes using a hammer drill to avoid cracking the concrete. Also, use a level to check the flatness and levelness of the keel frame. Use plastic washers to make adjustments if required.
Installation of Deck Boards
After the keel frame is installed, we can start installing the deck boards. According to the layout plan, cut the deck boards to the required size. At the same time, according to the actual need, the edges of the deck boards can be chamfered to improve their aesthetics and safety.
Place the cut deck boards on the keel frame and arrange them according to the layout plan. Use screws to fix the decking sheets to the keel frame. When fixing, make sure the screws are perpendicular to the decking sheets and tighten them using a screwdriver. At the same time, pay attention to the size of the gaps between the decking sheets for drainage and expansion.
Precautions
During the installation process, we need to pay attention to some details to ensure the solidity and aesthetics of the deck.
Choose a Reliable Quality Composite Decking Brand
Choose reliable, quality composite deck boards and keel framing materials to ensure the solidity and durability of the deck. When purchasing materials, you need to pay attention to their brand, origin, quality certification, and other information. It is recommended that you choose brands and quality products such as EVODEK, Trex, or COOWIN.
Use of Concealed Fasteners
The hidden fastener system utilises screws installed in the seams of the composite deck boards. This ensures consistent spacing while maintaining a neat and attractive appearance. In addition, when using screws, pre-drill surface screw holes to avoid damaging or splitting the ends of the boards.
Learn More: Composite Decking Hidden Fasteners vs. Screws
Dealing with Drainage Problems
Regularly inspect the deck surface and drainage system to ensure that there is no accumulation of water. If there is standing water, clean it up and check that the drainage system is clear.
For areas prone to water accumulation, consider adding drainage outlets or adjusting the inclination of the deck to improve drainage performance. At the same time, the deck is regularly cleaned and maintained according to the use and environmental conditions. This will extend the lifespan of the composite deck.
Construction Safety
Safety is always the first priority. During installation, always wear protective equipment such as helmets, protective glasses, gloves, and masks. Particular attention to safety is required when using power tools. In addition, consult with your local building department before beginning construction to ensure that your deck plans comply with local building codes and safety standards.
Conclusion
Installing a composite deck over concrete can provide you with a beautiful and functional outdoor living space. Proper selection and installation of composite decking is the key to ensuring quality. Through reasonable layout and fine construction, composite decks can be perfectly combined with concrete. If you still have questions about how to install composite decking on concrete, please contact us. EVODEK can provide you with professional products and guidance!
FAQ
Can Composite Decking be Installed Directly over Concrete?
It is not recommended to install composite decks directly on concrete. This is because concrete surfaces are often uneven and lack drainage properties. This can lead to deformation of the deck and waterlogging problems. It is recommended that a keel frame be installed on the concrete first, and then the deck boards be installed on the keel frame. This will ensure that the deck is solid, level, and has good drainage properties.
Do I Need a Building Permit to Install Composite Decking?
The need for a building permit depends on local regulations. It is recommended that you consult your local building code department for accurate information.
What are The Maintenance Intervals for Composite Decks?
Maintenance intervals for composite decks are related to the environment in which they are used. Generally, the surface condition and drainage system of the deck should be inspected at least once a year. If necessary, flush with soapy water and a hose. Seriously damaged deck sections need to be replaced or repaired promptly.
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