Omar Khalid
Installing plastic deck boards is a simple and satisfying process. It is important to plan properly to ensure a lasting structure and to avoid deck seams, which can make your deck look uneven. First, you need to decide on the positioning and straightness of the boards, as well as the design and colour variation. Then, you need to measure your deck and divide by the width of your boards to determine how many you'll need. After laying the deck boards, drill two screws through the board and into each joist. You can then install the second row of decking, leaving a gap between the boards. Finally, trim the overhanging boards to the same length with a circular saw.
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What You'll Learn
Planning and positioning
First, decide on the layout of your deck boards. Consider whether you want to install them diagonally or perpendicularly to the joists. Diagonal installation requires additional blocking underneath to support the deck boards. It's important to choose the right type of wood for this blocking, as wood exposed to different temperatures and environments can expand, warp, swell, contract, or crack.
Next, measure your deck area and determine the number of deck boards you'll need. Deck boards are typically available in standard sizes, such as 2"x4", 2"x6", or 5 1/4"x6". Calculate the approximate number of boards required by dividing the width of your deck by the width of the boards. Don't forget to add an extra 10-15% to account for errors and cutting adjustments.
Now, it's time to position your first deck board. Determine your fascia installation. If your fascia will be installed under the decking, your deck board should overhang it by about 3/4". Refer to the manufacturer's guidelines for specific overhang recommendations. Place the first board on the deck, aligning it with your chosen positioning. Mark the post locations on the board using a speed square and a pencil. Cut out the notch with a jigsaw, then place the board onto the deck frame.
After positioning the first board, mark each rim joist at a distance equal to the width of one decking board from the outside of the header joist. Use a chalk line to create a straight line across all the marks, parallel to your house. This line will guide the alignment of your first length of decking. Drill two screws through the board and into each joist, with a distance of 3/4" to 1" from the edge of the board.
Finally, continue installing the rest of the deck boards. Ensure they are evenly spaced, leaving about an 1/8" gap between them to allow for expansion and moisture drainage. You can use a spacer to maintain consistent gaps throughout the deck. If you're using pressure-treated lumber, install the boards tightly together, as the gaps will increase once the wood dries.
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Choosing the right materials
Deck Board Options: Plastic deck boards are typically made from composite materials, which blend recycled plastic and wood fibres. Composite decking is a durable and low-maintenance option that can withstand different temperatures and environments. It is essential to choose straight boards with at least one clean side, free from blemishes, for a snug fit and a uniform appearance.
Deck Board Size: Standard deck boards usually come in sizes such as 2"x4", 2"x6", or 5 1/4"x6". The thickness is typically 5/4", and they are often available in standard lengths of 12 feet or 16 feet. Consider the size of your deck and the desired board spacing to determine the appropriate board length and width.
Fascia Installation: Determine whether you will be installing the fascia under the decking or flush with the top. If installed under the decking, the deck board should overhang the fascia by about 3/4". Refer to the manufacturer's guidelines for specific overhanging recommendations.
Deck Screws: Opt for decking screws, which have larger heads and are stronger than traditional screws. Galvanized deck screws are also recommended to fasten the deck boards securely to the joists. If using composite screws, ensure they are installed flush with the top of the deck board.
Hidden Fasteners: For a seamless and aesthetically pleasing finish, consider using hidden deck clips and grooved composite boards. Hidden fasteners provide a cleaner look and ensure correct gapping between the boards. TOPLoc Hidden Fasteners, for example, offer step-by-step instructions for PVC and composite decking installations.
Universal Fasteners: Universal fasteners, or deck clips, are another option to achieve consistent spacing between boards. They are placed at each joist to secure the boards in place. Universal fasteners result in a cleaner appearance than screws alone.
By carefully selecting the right materials and components, you can ensure a sturdy, long-lasting, and visually appealing plastic deck installation.
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Installing the frame
To install plastic deck boards, you will first need to build a frame. This process can be labour-intensive, so it is recommended to seek assistance.
The first step in framing is to install the 6x6 posts. Cut each post using a miter saw, making multiple passes and rotating the lumber after each cut. Next, adjust the locations of the post bases and secure the 6x6s to metal plates.
You will then need to mark each rim joist. Use a chalk line to create a line that touches all the marks across the joist and is parallel to your house. Align the inside edge of the first length of decking with this chalk line. Drill two screws through the board and into each joist, with the screws 3/4 to 1 inch from the edge of the board.
If your deck is against a house or structure, you will need to cut the last board to length, as a circular saw may not be able to complete the ending trim cut if there is limited room to manoeuvre. Once all your deck boards are in place, snap a chalk line from the back corner of the deck to the front corner on the same side. Then, use a circular saw to trim all the overhanging boards to the same length, flush with the side of your deck frame.
Finally, to ensure your frame is secure, you may need to add a second support joist on both sides of the deck and extra blocking to support the double picture frame. The spacing should be 16" on centre. If a deck board runs in the same direction as the joists, additional blocking is needed, and this must be installed using exterior-grade screws, not nails.
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Laying the deck boards
Planning and Preparation:
Before laying the deck boards, it is important to plan and prepare. Check your local building codes and regulations to ensure compliance. Decide on the direction you will lay your deck boards, considering the desired design and colour variation. Measure the deck area and determine the number of posts and their spacing. Choose the type of deck boards you will use, ensuring they are straight and free from blemishes. Calculate the number of boards needed, adding 10-15% for errors and cuts.
Fascia Installation:
Determine your fascia installation. If installing the fascia under the decking, your deck board should overhang the fascia by about 3/4", but always refer to the manufacturer's guidelines. Place the first board on the deck, aligning it with the desired positioning. Mark the post locations on the board using a speed square and pencil.
Cutting and Placement:
Use a jigsaw to cut out the marked notch from the first board. Place this board onto the frame of the deck. Install universal fasteners or composite deck screws to secure the board in place. If using screws, ensure they are installed flush with the top of the deck board. For a cleaner look, consider using hidden deck clips and grooved composite boards.
Securing the Boards:
Drill two screws through the first board and into each joist, at a distance of 3/4 to 1 inch from the edge. If using hidden deck clips, start near the house side of the deck and secure the start/stop clips flush with the rim joist, spaced about every 16 inches. Place the groove of the first board over the clip prongs and insert a clip prong into each subsequent joist. Secure the board with screws and repeat for each additional board, sliding them tightly into place.
Trimming and Finishing:
Once all the boards are in place, use a chalk line to snap a line from the back corner of the deck to the front corner on the same side. Use a circular saw to trim all the overhanging boards along this line, ensuring they are flush with the side of the deck frame. If installing skirting, leave a 1-1/4-inch overhang. Finally, cover any cut edges with fascia boards, and you're done!
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Trimming and finishing
First, determine if your deck boards need trimming. It is common to leave the boards extending over the edge of the deck, and they can be cut later for a uniform appearance. If your last board is close to a structure or your home, you will need to trim it to length.
Next, use a chalk line to snap a straight line from the back corner of the deck to the front corner on the same side. This line will serve as a guide for trimming the overhanging boards. Using a circular saw, cut along this line to trim the boards, ensuring they are flush with the side of your deck frame. A miter saw is also an efficient option for cutting the boards to the desired length.
When installing the deck boards, you can use hidden deck clips and grooved composite boards for a seamless look. Place the clips flush with the rim joist, spaced approximately 16 inches apart. Secure the clips with screws and then slide the boards into place, fitting the groove over the clip prongs.
For a consistent gap between the boards, use a spacer. Most wood types require an 1/8-inch gap, but this may vary depending on the specific wood and environmental factors. If you are using pressure-treated lumber, install the boards tightly together, as the gaps will increase as the wood dries.
Finally, if you are installing skirting, leave a 1-1/4-inch overhang. You can cover the cut edge with a fascia board for a neat finish. If you are not installing skirting, cut the decking flush with the joists. Don't forget to refer to the manufacturer's guidelines for overhanging recommendations.
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Frequently asked questions
You will need to start by installing the frame. Then, lay your deck boards flat, side down, and spaced out to allow for expansion and moisture. Mark the post locations with a speed square and pencil, and cut the notches out with a jigsaw. Drill two galvanized deck screws into each joist, with one screw on each side where the deck board crosses a joist.
You will need a speed square, a pencil, a jigsaw, and a cordless drill. You will also need deck screws, which have larger heads than traditional screws.
Snap a chalk line along the end joist and cut along the line with a circular saw. Leave a 1-1/4-inch overhang if you are installing skirting.
Deck boards are usually 6 inches wide, 5/4” thick, and come in standard lengths of 12 or 16 feet. They should be installed perpendicular to the joists, with an 1/8-inch gap between the boards.
