I'm currently remodeling my pool deck, and we're planning on pouring 2.5 inches of concrete over a plywood base. Initially, I thought about treating the plywood with a sealant and adding plastic sheeting for extra waterproofing. However, my concrete guy warned me that pouring concrete over plastic could lead to cracking as it dries. My contractor believes that the sealed plywood should hold up just fine and even suggested adding a paper-based layer if I wanted. I'm still anxious about potential water damage and whether rot could set in. Is sealing the plywood the best option, or are there better methods my contractor might not be considering?
2 Answers
From what I've seen, plywood will eventually rot in wet conditions regardless of sealing. Instead of using plywood, you might want to consider pouring directly on tamped gravel with metal mesh for support—it's a more traditional method for pool decks. This way, you can ensure better drainage and reduce the risk of cracking.
I've seen concrete poured over a plastic barrier before, but if you're concerned about heat causing cracks, you may want to skip the plastic altogether. I suggest just sealing the plywood well, maybe using something like Red Gard for a bit of extra protection, and then go straight to the concrete without any additional layers.
That method with Red Gard does work! Just make sure you let the concrete cure well afterward for the best results.
Totally agree! Keeping it off the ground is key. Proper drainage will really save your deck from future issues.