How to Build a Deck Over a Concrete Patio DIY
1/2-in. thick PVC trim; 3/16 x 3 1/4-in. concrete screws; Decking; Flashing tape; Plastic shims; Self-leveling compound ... Even if your patio is in terrible shape, you can deck over it. ... To preview the situation, lay a straight board across the patio in a few spots. ... If kept damp, common grades of treated wood will eventually rot.