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How to build a composite deck over concrete patio with limited height space.

I have only 2” height space from my patio ground to the sliding door, and I don’t want break the concrete, so I can not use any dimensional lumber whatever for joists or decking board. So I use 3/4×1-1/2 pvc trim board for joists and 1” composite decking board, it’s totally height is only 1-3/4”, and the pvc board can also avoid rot. To prevent blocking water drain under deck, I trimmed 1” wide tunnel every 3” on the pvc board. For connect the pvc board, I only use staples, because I don’t want break any pipeline underground, and it also save me plenty time from drilling into concrete. They can not been moved after screw decking board on them. For the steps, you have to screw it into the concrete, but you don’t worry about any pipeline under it.