How to Install Composite Decking Over Wood

Using composite decking to cover a wood deck is a great way to achieve a new look. You must make sure that the frame will hold the additional weight. This can be done by adding joists to make spacing no more than 12 inches between the framing members.

Supplies:

• Quick square


• Treated deck screws


• Drill


• Composite decking


• Circular saw


• Jigsaw


• Tape measure


• Treated lumber for joists


• Joist hangers

1. Reinforce the frame by putting in enough joists to make the spacing between them 12 inches or less. Take some joist hangers to install the new framing members and join them from beneath the deck.


2. Square the joist hangers with the rim and attach one side. Fold the other side open to accept the joist. Attach the hangers at the ends and measure in between the outside joists.


3. Cut the new joist to the length from the exact size as the existing and slide under the deck. Lift it into the hanger and push the hanger's loose side in position, and join it to the rim joist, as well. Then add the hanger.


4. Attach the existing deck boards to the new joist with two screws in the intersections between them. Add screws or nails to tack deck boards that are loose. Look at the joints on the posts, the joist hangers and secure any loose bolts or screws.


5. Start at one corner of the deck to lay the boards. Begin at the outside edge if the deck connects to the house. Lay the composite decking perpendicular to the original. This allows precipitation and moisture to run off. Screw the decking with two screws side-by-side every 16 to 24 inches.


6. Use several full lengths to get the most use of the material. Measure and cut some notches around the deck posts and the other obstructions using a jigsaw. Cut the end pieces to length by joining them to the deck, and cut off the overhang with a quick square or circular saw.


7. Make the first set of screws within the first four inches of the new boards for stability. Use a framing square for proper drainage.


8. Drive the screws below the face of the decking to stop moisture buildup on the screw heads. Use 1 5/8-inch treated deck screws for the attachment.


9. Trim the final board to fit along the house. Use a chalk line to mark any bevel or angle needed for a good fit.